Implant Survival Rate Research Articles

Evaluation of Internal and External Hexagon Connections in Immediately Loaded Full-Arch Rehabilitations: A Multicenter Randomized Split-Mouth Controlled Trial With a 6-Year Follow-Up.

Full-arch immediate loading rehabilitations are now a widely used rehabilitation method that guarantees predictable medium- and long-term results. Numerous factors can influence its success and stability in the medium and long term. Among these the implant-abutment connection seems to play an important role, however there is still little information on which is the most suitable in this type of treatment. The aim of the present multicenter split-mouth controlled trial is to evaluate whether external hexagonal connections (EHC) and internal hexagonal connections (IHC) can influence success, bone resorption and peri-implant parameters in immediate-load full-arch rehabilitations. Twenty patients were rehabilitated with immediately loaded fixed full-arch rehabilitations. All the implants presented the same macro- and micro-topography but different implant-abutment connection. IHC were used in one randomly selected side of the jaw and EHC was used in the other side. Outcome measures were implant survival rate, peri-implant marginal bone loss (MBL), plaque index (PI), probing depth (PD), and bleeding on probing (BoP) evaluated at 3, 6, 12, 36, and 72-month post-loading. Technical and biological complications were recorded. In 20 patients, 43 EHC and 40 IHC implants were placed. Between 32 and 72 months of follow-up two patients withdrew (died) and no implants were lost. The cumulative survival rate (CSR) was 97.44% for EHC implants and 97.22% for IHC implants. The MBL presented a resorption of 2 mm in the EHC group and 1.9 mm in the IHC group. No statistically significant differences were found between the two groups for any of the parameters at any time. No biological or technical complications were detected between the 36th and 72nd month of follow-up. After 72 months in function, both internal and external hexagon connections provided good clinical outcomes and were not associated with any significant difference in the clinical outcomes.

Metal-Free Custom-Made Zirconia Implants-A Prospective 5-Year Follow-Up Single-Arm Clinical Trial.

Dental implants made of zirconia (ZrO2) are a potential alternative for titanium implants in dentistry because of their good biocompatibility, mechanical properties and excellent aesthetic results. However, solid long-term scientific data to prove clinical success of ZrO2 implants are scarce. The aim of this study was to describe and to examine the clinical performance of custom-made two-piece ZrO2 implants, to identify possible influencing factors: a) manipulation of the implant after placement and b) the occlusal scheme on the survival rate, and to evaluate the performance of the implant-supported crown. This follow-up study collected and examined the 5-year data to answer the main question: What are the survival and the success rates of custom-made ZrO2 implants in the maxillary premolar region after 5 years? Of the 31 included patients in this prospective 5-year follow-up single-arm clinical trial, 30 received a custom-made ZrO2 implant to replace a missing single maxillary premolar, which was subsequently restored with a lithium disilicate crown. Parameters regarding clinical performance, marginal bone-level (MBL) changes, and patient-related outcome measures (PROMs) were assessed preoperatively, at the baseline, as well as 1 and 5 years after crown placement. Chances of survival and success of the implant were calculated and displayed using Kaplan-Meier statistics. Kaplan-Meier survival analysis was also performed with stratification based on the variables "manipulation of the implant prior to impression taking" and "occlusal scheme" and compared using log-rank tests. Bone-level moderation in time was compared using a paired samples t-test. Patient's expectations and satisfaction after 5 years were compared as a measure of fulfilled expectations, using a Wilcoxon signed-rank test. Performance of the implant-supported crowns was evaluated using validated criteria. Survival and success probabilities after 5 years were, respectively, 75.8% (95% CI [60.0%; 91.0%]) and 71.0% (95% CI [54.0%; 88.0%]) for the custom-made ZV3 implants. No significant differences in survival rate were found after stratification on "manipulation of the implant" and on "occlusal scheme." Mean bone-level alteration between baseline and the first follow-up was +0.06 mm (95% CI [-0.23 mm; 0.12 mm]; SD = 0.42 mm) and between baseline and the second follow-up was +0.04 mm (95% CI [-0.35 mm; 0.26 mm]; SD = 0.54 mm). Patients' satisfaction for patients with implants still in function after 5 years was 91.7% (IQR = [90.5%-97.3%]), indicating satisfaction with the treatment. Pooled satisfaction in patients with successful implants after 5 years was significantly higher than patients' expressed expectations before treatment. None of the crowns failed, and no interventions were required. Survival rate of these particular ZV3 implants in our study was lower than expected and clinically not acceptable. Hence, ZV3 implant placement as applied in this study cannot be recommended for clinical practice. Further research on the different appearances of mechanical failure in ZrO2 implants would be highly recommended before a larger prospective randomized clinical trial is conducted to evaluate treatment with custom-made ZrO2 dental implants.

Influence of Schneiderian membrane perforation during maxillary sinus floor augmentation with lateral approach on dental implant survival rates: a retrospective study in a university setting.

The primary objective of this study was to compare implant survival rates (ISR) in patients undergoing maxillary sinus floor augmentation (MSFA) with lateral approach with and without membrane perforation. Secondary objectives were to establish the percentage of perforations in these procedures and to evaluate the influence of perforation size on ISR. This retrospective study included patients requiring MSFA with lateral approach. Cases were assigned to two groups according to the occurrence or not of perforation. The exact size of each perforation was registered. Descriptive statistics and associations between the groups were calculated. This study analyzed data from 90 MSFA in 72 patients. Membrane perforation occurred in 24.44%. A total of 170 implants were placed; 72.35% were placed under intact membranes and 27.65% on repaired membranes. The overall ISR in MSFA procedures with intact membranes was 98.37%, and 93.62% in perforated membranes. No statistically significant relationship between groups was observed although the odds of implant failure increased by 4.125 times when perforation occurred. In turn, no statistically significant relationship was observed between perforation size and ISR. Implants inserted below repaired membranes had a lower ISR compared with implants inserted below intact membranes although the difference was not statistically significant. Moreover, no significant statistical correlation was observed between perforation size and ISR. Membrane perforation does not have a significant influence on subsequent implant survival rates. Knowledge of the exact size of the membrane perforation is essential for deciding on the right treatment plan.

Challenges and Long-Term Outcomes of Cementless Total Hip Arthroplasty in Patients Under 30: A 24-Year Follow-Up Study with a Minimum 8-Year Follow-Up, Focused on Developmental Dysplasia of the Hip

Background: Total hip arthroplasty (THA) is a well-established and effective treatment for advanced osteoarthritis (OA) of the hip joint. While commonly performed in older patients, THA is increasingly used in younger individuals, especially in cases of secondary coxarthrosis. Technological advances have led to the development of specialized implants, which allow surgeons to address severe post-inflammatory or dysplastic deformities. Younger patients undergoing THA, often in their 20s or 30s, present higher functional expectations. Despite limited long-term studies, research indicates a higher rate of revision surgeries in this age group compared to older populations, making these procedures a unique challenge. Methods: This retrospective study analyzed 5263 primary total hip arthroplasties (THAs) performed at our center between May 1985 and December 2016. After excluding cemented and hybrid implants, as well as patients lost to follow-up or with other etiologies, 101 uncemented THA procedures in 92 patients aged 30 years or younger were included. The majority (64.4%) were due to dysplastic coxarthrosis (DDH), while avascular necrosis (26.7%) and juvenile rheumatoid arthritis (8.9%) accounted for the rest. The average patient age was 25.6 years, with a mean follow-up period of over 24 years. Surgical technique involved the anterolateral approach, with implants placed in the true acetabular region. Implants included Munich/Plasmacup, Mittelmeier, and P-M designs. Implant survival was estimated using the Kaplan–Meier estimator to determine the probability of implant longevity over the follow-up period. Outcomes were assessed using Merle d’Aubigné and Postel scores, modified by Charnley, alongside radiographic evaluations based on the Crowe, De Lee, and Gruen classifications. Results: Preoperatively radiological assessment of all hips was classified as grade IV according to the Kellgren–Lawrence scale. Over an average follow-up of 24 years, final outcomes using the modified Merle d’Aubigné and Postel (MAP) classification were excellent in 24%, good in 37%, satisfactory in 8%, and poor in 32% of cases. Results compared between DDH group and control group indicate significantly more poor results for the DDH group compared to the control group (p-value < 0.05). All poor outcomes were associated with prosthesis loosening, primarily involving P-M and Mittelmeier acetabular components. Complications included intraoperative fractures in five cases, peripheral nerve dysfunction in six cases, and heterotopic ossification in eight cases. Postoperative pain scores on the VAS scale improved from 6.8 to 1.7. The Kaplan–Meier estimator indicated 10-year survival rates of 85.2% for the entire prosthesis, with 69.8% survival at 15 years and 54.5% at 20 years. For each period the bio-functionality according to Kaplan–Meier estimator was in favor of the control group. Conclusions: Cementless THA in patients aged 30 or younger has demonstrated itself to be an efficacious treatment for hip osteoarthritis, yielding favorable bio-functional outcomes in both short- and long-term follow-up. Nevertheless, THA performed in the context of developmental dysplasia of the hip (DDH) carries a significantly elevated risk of postoperative complications, most notably aseptic loosening, which critically undermines implant survival rates. Given the young demographic and the anticipated prolonged functional lifespan of the prosthesis, there is an increased propensity for loosening over time, necessitating vigilant and sustained postoperative surveillance.

Treatment Outcomes of Four-Implant-Retained Maxillary Palateless Overdenture: A 5-Year Observational Study.

Palateless overdentures (PLODs) provide advantages of improved taste perception and retention over conventional dentures. We aimed to evaluate 5-year outcomes of four implant maxillary PLODs. In this prospective observational study, edentulous participants were enrolled. A new conventional maxillary denture was prepared followed by implant placement and insertion of four implant retained maxillary PLOD. Oral health quality of life was assessed using the 49-item Oral Health Impact Profile (OHIP-49) at multiple intervals over 5 years along with biological and mechanical outcomes. Nine patients were evaluated at year 5. The mean age was 68 years, and six of the nine patients were males. The cumulative survival rate of implants was 100% while the implant success rate was 86%. Nylon retentive replacement was the most common encountered complication noted approximately four times per patient over 5 years. From a mean OHIP-49 severity score of 71.2 at baseline, severity scores decreased to 23.9 (p < 0.001) at year 1, denoting a clinically meaningful and statistically significant improvement in oral health quality of life. The lowered OHIP-49 severity scores remained stable throughout 5 years of follow-up. Four implant supported maxillary overdenture appears to have good patient perceived, biological and mechanical outcomes over 5 years. Fully powered studies are needed to replicate these findings.

Three-Dimensional Scaffolds Designed and Printed Using CAD/CAM Technology: A Systematic Review

The objective of this work is to review the literature on the use of three-dimensional scaffolds obtained by printing for the regeneration of bone defects in the maxillofacial area. The research question asked was: what clinical experiences exist on the use of bone biomaterials manufactured by CAD/CAM in the maxillofacial area? Prospective and retrospective studies and randomized clinical trials in humans with reconstruction area in the maxillofacial and intraoral area were included. The articles had to obtain scaffolds for bone reconstruction that were designed by computer processing and printed in different materials. Clinical cases, case series, in vitro studies and those that were not performed in humans were excluded. Six clinical studies were selected that met the established inclusion criteria. The selected studies showed heterogeneity in their objectives, materials used and types of regenerated bone defects. A high survival rate was found for dental implants placed on 3D-printed scaffolds, with rates ranging from 94.3% to 98%. The materials used included polycaprolactone, coral-derived hydroxyapatite, biphasic calcium phosphate (BCP) and bioceramics. The use of CAD/CAM technology is seen as key for satisfying variations in the shapes and requirements of different fabrics and size variations between different individuals. Furthermore, the possibility of using the patient’s own stem cells could revolutionize the way bone defects are currently treated in oral surgery. The results indicate a high survival rate of dental implants placed on 3D-printed scaffolds, suggesting the potential of this technology for bone regeneration in the maxillofacial mass.

Patient-specific instrumentation improved clinical outcome and implant survival but is not superior compared to conventional total knee arthroplasty: Ten years follow-up of a multicenter double-blind randomized controlled trial.

Patient-specific instrumentation (PSI) is a commonly used technique designed to improve mechanical alignment in total knee arthroplasty (TKA) and was therefore believed to lead to better clinical outcome and implant survival rates compared with conventional instruments (CIs). To date, long-term results comparing these two techniques are not available. This study is a 10-year follow-up of a previous double-blind multicenter randomized controlled trial where PSI was compared with CI. Patients with osteoarthritis of the knee who were candidates for TKA were included. Exclusion criteria were metal near the knee-, ankle- or hip joint, patients with contra-indications for a magnetic resonance imaging (MRI) scan and patients who had previous knee surgery (except arthroscopic meniscectomy). Clinical outcomes were assessed using patient-reported outcome measures (PROMs), and the analysis was performed with a general linear mixed model for repeated measurements. Kaplan-Meier curves were used to compare revision rates. X-rays were obtained and examined by two individual reviewers for any signs of loosening of the components. At a mean follow-up of 10.1 (SD 0.1) years, 129 patients (loss to follow-up 23%) were analysed in this trial. No statistically significant difference between the two groups were found for any of the PROMs and revision rates were comparable, six in the PSI group and three in the CI group (p = 0.29). Two X-rays in the PSI group showed a radiolucent line of the femoral component. At 10-year follow-up, PSI does not lead to better clinical outcome or survival of the prosthesis compared with CI.

Mandibular Implant-Supported Overdentures Using Telescopic Crowns and Immediate Loading Protocol: A 2-Year Prospective Follow-up Study.

Implant-supported overdentures have been an effective treatment method for edentulous mandibles. However, the loading time after implant placement is still controversial. The purpose of this study was to evaluate the outcome of implant-supported overdentures using telescopic crowns for the treatment of edentulous patients with immediate loading protocol. This study was conducted on 22 edentulous mandibular patients visiting the Department of High Technique, National Hospital of Odonto - Stomatology, Ho Chi Minh City, Vietnam for prosthodontic rehabilitation. Each patient received four interforaminal implants. Immediate loading protocol was applied, and Ankylos Syncone copings systems was used to connect the prosthesis and the implants. The survival rate of implants and prostheses, as the primary outcome, were evaluated at 6 months, 01 year, and 02 years post-surgery. Peri-implant tissue condition, peri-implant bone loss, and patient satisfaction were the secondary outcomes. The implant survival rate was 98.9% with 01 failed implant. The peri-implant bone loss changes after 6 months, 01 year, and 02 years were 0.07 ± 0.22 mm, 0.12 ± 0.3 mm, and 0.15 ± 0.2 mm, respectively. No gingival hyperplasia was recorded. The prosthesis survival rate was 86.4% with 1 fractured overdenture, 1 overdenture relining and 1 abutment fracture. Mandibular rehabilitation using implant-supported overdenture with telescopic crowns and immediate loading protocol showed high survival rates of both implant and prosthesis in 2-year follow-up.

Autogenous Tooth Graft Biomaterial in Guided Bone Regeneration: A Comprehensive Review

Objective: This review evaluated the use of autogenous tooth as a bone graft material in guided bone regeneration (GBR). Moreover, it compared the results of GBR using autogenous demineralized dentin, partially demineralized dentin, and mineralized dentin with or without membrane to verify its clinical advantage, effectiveness, and safety. Methods: A search was conducted in PubMed/MEDLINE, Lilacs, Embase, Cochrane, and Scopus databases. Specific criteria were established for the inclusion and exclusion of studies, including types of studies considered, target population (clinical studies: humans), evaluated intervention (studies assessing and comparing autologous demineralized dentin, partially demineralized dentin, and mineralized dentin in GBR with or without resorbable membrane), and language and publication period of articles (English and published in the last 11 years). A detailed assessment of the methodological quality of the selected studies was conducted using the JBI critical appraisal tool. Results: Based on the analysis conducted, out of 174 potentially relevant articles obtained, only 19 publications met the inclusion criteria, with three papers showing medium quality/moderate risk of bias and the rest with high quality/low risk of bias. Comparison between groups revealed stability of the newly formed bone, low marginal bone loss, clinically acceptable primary and secondary implant stability quotient (ISQ) values, and high implant survival rates after using autogenous tooth biomaterial. Conclusions: The results of this review on the use of autogenous teeth as a bone graft material in guided bone regeneration indicated that the technique has the potential to be an effective and safe treatment option. Analysis of selected studies showed favorable evidence for the use of autogenous teeth in bone regeneration, suggesting clinical benefits, most for socket preservation. These results are relevant for guiding clinical practice and assisting dental professionals in having options for biomaterials for bone regeneration.

Comparison of three approaches for treating the bony access window in lateral sinus floor elevation: a retrospective analysis

The aim of this study was to retrospectively determine the effects of applying different treatment methods to the bony access window on the healing outcomes in lateral sinus floor elevation (SFE). Lateral SFE with implant placement was performed in 131 sinuses of 105 patients. The following three treatment methods were applied to the bony access window: application of a collagen barrier (group CB), repositioning the bone fragment (group RW) and untreated (group UT). Radiographic healing in the window area, augmented bone height changes and marginal bone level changes were examined. Mixed logistic and mixed linear models were analyzed. Over 4.3 ± 1.4 years of follow-up, the implant survival rate was 100% in groups CB and UT, and 96.9% in group RW. The treatment applied to the window did not significantly influence the radiographic healing in the window area, augmented bone height changes or marginal bone level changes (p > 0.05). The healed window areas had generally flat morphologies and were fully corticalized. The mean changes in the augmented bone were less than 1.5 mm in all groups. Marginal bone level changes were minimal. In conclusion, Healing outcomes were not different among three different methods to treat the bony access window in lateral SFE.

Short implant versus conventional implant in the posterior atrophic maxilla: A systematic review and meta-analysis

Objective: A comparative study undertaken to measure the the marginal bone loss (MBL), implant survival rate, and prosthetic and biological complications among short implants (8 mm or shorter) and conventional implants (longer than 8 mm) in the posterior atrophic maxilla. Materials and Methods: A search in three databases PubMed (Medline), Scopus, and Cochrane was conducted. The present systematic review was registered with identification number CRD42020212805 at the International Prospective Register of Systematic Reviews. Data extraction included the publication year, patients’ number and number of implants, implant length and width, MBL, implant survival rate, and biological and mechanical complications. The Cochrane Risk of Bias 1.0 tool was used to assess the risk of bias. A meta-analysis was performed to evaluate the outcome variables. Comparisons for dichotomous variables, such as prosthetic and biological complications and implant survival rate, were done by applying the Mantel–Haenszel method. In contrast, a comparison was made by applying the inverse variance method for continuous variables like MBL. Results: Initially, 618 reports were recognized from electronic database searches. Five randomized controlled trials (RCTs) were included in the meta-analyses regarding the MBL, implant survival rate, and prosthetic complications, while three were included for biological complications. In 5 years of follow-up, no evidence of difference could be found between conventional and short implants for survival rate (risk ratio [RR]: 3.54; 95% confidence interval [CI]: 0.99–12.67; P = 0.05; I 2 = 0%). We do not find any evidence of difference for MBL between short implants and conventional implants (mean difference: −0.29; 95% CI: −0.49 to −0.08; P = 0.02; I 2 = 65%). Furthermore, no evidence of a difference exists between short and conventional implants for prosthetic complications (RR: 1.56; 95% CI: 0.68–3.55; P = 0.29; I 2 = 0%). The biological complications were seen less with short implants (RR: 0.47; 95% CI: 0.24–0.93; P = 0.03; I 2 = 0%). Conclusion: The results suggest no significant difference among conventional and short implants regarding survival rate in the posterior atrophic maxilla. The results of this systematic review and meta-analysis suggest that, for a 5-year period of follow-up, short implants are related to rarer biological complications and comparable MBL compared to conventional implants. Despite these promising findings, long-term studies with consistent study designs and clinical protocols are required to appraise the performance and durability of short implants.

Quarter Century Outcomes of Alumina Ceramic-on-Ceramic Total Hip Arthroplasty

BackgroundAlumina ceramic-on-ceramic (CoC) bearings were widely used in total hip arthroplasty (THA) due to their superior wear resistance and inert properties, making them ideal for young, active patients who require long-lasting implants. This study aimed to synthesize findings from previous reports, providing a comprehensive follow-up of at least 25 years on the clinical and radiologic outcomes, the prevalence of osteolysis, and implant survivorship in patients undergoing primary cementless CoC THA. MethodsWe have previously reported five-to-ten-year outcomes following the implementation of third-generation alumina-on-alumina bearings in a consecutive series of 100 primary cementless THAs. This report updates those results with a minimum follow-up of 25 years. Of the original cohort, 58 patients who had 67 hips were available for the latest follow-up. Clinical assessments were performed using the Harris Hip Score (HHS) and pain questionnaires. Radiographic evaluations were employed to assess implant fixation and osteolysis. ResultsAt the final follow-up, the implant survival rate was an impressive 96.3%, with revision of the implant as the endpoint. The mean HHS improved significantly from preoperative values to 90.1, indicating excellent functional outcomes. The incidence of ceramic-related noise increased over time, with three cases of ceramic head fractures requiring a change of bearings. Notably, the extent of stem notching observed in earlier reports did not show further progression. Radiologically, all implants demonstrated bony ingrowth with no signs of aseptic loosening or major osteolysis. ConclusionThe long-term (minimum 25-year) follow-up of alumina-on-alumina bearings in primary cementless THA demonstrates outstanding implant survivorship, excellent functional outcomes, and minimal adverse effects over twenty-five years. Despite some issues like ceramic-related noise and component fractures, the overall performance of CoC bearings remains highly encouraging, particularly suitable for young, active patients. Surgeons should provide appropriate education to both potential THA candidates and patients who already have THAs with CoC bearings.

Immediate implant placement in damaged extraction sockets: a systematic review and meta-analysis of randomized controlled trials.

The aim of this study was to observe whether immediate implant placement (IIP) into damaged extraction sockets is a successful modality for treating hopeless teeth that require extraction. An electronic search was carried out through four databases (PubMed/MEDLINE, Web of Science, Scopus, and ScienceDirect) to identify randomized controlled trials (2013-2023) to understand whether IIP in damaged sockets is a successful treatment. The focus question was, 'In a patient with a hopeless tooth that needs extraction with the indication for dental implant treatment, is IIP in damaged extraction sockets, compared to undamaged sockets or healed sites, an effective method for the replacement of hopeless teeth and achieving a favorable clinical result?' The risk of bias was appraised and a meta-analysis using random effect was applied. Five studies with 135 patients and 138 implants were included. The implant survival rate was 100% for all studies and period evaluated; the pink esthetic score (PES) scores had no statistically significant result for all articles that evaluated this parameter; the soft tissue changes was reported by two studies: one found no significant differences and the other showed that the test group experienced reduced soft tissue loss at the 1-year evaluation (measured with digital intraoral scanners); other two studies assessed the marginal bone loss, presenting no differences between groups. The meta-analysis showed homogeneity between the studies. There was an equilibrium among the groups in the various studies included, and age tended to be lower in the test group. The buccal bone tissue and pink esthetic score showed favoritism for the test group but without statistical significance. This study suggests that IIP in the presence of buccal bone defects can achieve comparable clinical and radiological outcomes to traditional methods in the short term of the limited studies available. The buccal aspect is not possible to be evaluated through radiographs. Bone regeneration was essential to reach optimal results. It is important to emphasize that IIP requires adherence to rigorous criteria to ensure functionally acceptable results.

TMJ Concepts Patient-Fitted TMJ Reconstruction Prosthesis System: Results from an FDA Post-Market Surveillance Prospective Cohort Study

BackgroundCustom-designed and patient-fitted temporomandibular joint replacement devices (TMJR) are employed to manage end-stage TMJ pathology, distorted bony TMJ architecture, or in patients who have undergone multiple prior failed TMJ surgeries. PurposeThis study aimed to measure the frequency of revision or replacement over time, estimate the 1, 2, and 3-year survival rate of implants, and determine what demographic, anatomical, or operative variables may be associated with a device adverse event. Study design, setting, and sampleA prospective cohort study was conducted on consenting adults who could read English, implanted with the TMJ Concepts TMJR prostheses between 2013 and 2015 by private or academic surgeons. Patients under the age of 18 and those who were incapable, unwilling, or unable to complete the perioperative forms were excluded. Outcome variablesThe primary outcome variable was the frequency of adverse events, which is defined as device revision or replacement. The secondary outcome variable was the survival rate for the TMJ Concepts devices. AnalysesDevice survival at 1, 2, and 3 years was estimated using the Kaplan-Meyer methodology. Cox proportional hazards regression was used to analyze the effects of the predictor variables for the device survival rate. A p-value of <0.05 was considered significant. ResultsA total of 738 subjects (1098 joints) were enrolled in the study with 102 (14%) males and 636 (86%) females. The mean age was 45.4 (+ 14.8) years. The median follow-up period was 36.2 months (95% CI: 36.1 – 36.2 months). A total of 187 subjects (25.3%) were lost to follow-up during; the study period. Forty-nine devices (4.46%) were associated with an adverse event at 3 years. The; 3-year device survival was 95.1 % (95% CI: 93.6 – 96.3%). The only significant risk factor for an adverse event was the asymmetry of the mandible (hazard rate ratio = 1.989, p = 0.03). The primary diagnosis was not associated with the time to an adverse event (p-value = 0.8685). Infection (44.7 %, 21 joints) and material sensitivity (12.8 %, 6 joints) were the most common reasons specifically for device removal/replacement in the study cohort. ConclusionsInfection was the primary reason reported for device revision or replacement followed by material sensitivity. In the study cohort, the device survival following implantation of the TMJ Concepts prosthesis was not significantly different than reported by the TMJR stock device.

Risk Factors for Implant Failure Following Transcrestal Sinus-Floor Elevation: A Case Report and Literature Review.

Although transcrestal sinus floor elevation (TSFE) is widely used for cases of insufficient residual bone height in the posterior maxilla, few studies focus on the risk factors of early implant failure associated with TSFE procedures. This study aimed to identify and summarize the possible risk factors of implant failure associated with TSFE to ensure a more predictable implant survival rate using TSFE. We report the treatment of a patient with implant failure following TSFE and discuss this case's possible associated risk factors. A standard implant with a diameter of 4.8 mm and length of 10 mm was used after the TSFE procedure. Implant loosening was suddenly observed 6 weeks after the initial surgery. Factors that could result in early implant failure included patient-related risk factors, anatomical factors of the operational area, and operation- and implant-related factors. Within the current study's limitations, the graft material particles between the implant surface and socket could be considered a direct risk factor resulting in implant failure. Therefore, more attention should be paid to socket cleaning during the TSFE procedure, and loose particulate grafting materials should be discouraged. Another significant consideration for implant loss is the possibility of fractures in the buccal or palatal cortical plates during the site preparation and implant insertion. Thus, these factors should be studied further and receive more clinical attention.

Clinical and radiographic changes following transcrestal sinus augmentation: A scoping review of the last 25 years.

Maxillary sinus floor elevation is a surgical procedure intended to increase the volume of the bone vertically to accommodate dental implant placement. This intervention is frequently required for implant installation in the posterior maxilla, where the bone may be insufficient for securing implants of necessary length and stability. Sinus floor elevation can be completed either through a direct approach with a "window" through the lateral wall of the alveolar ridge or an indirect "transcrestal/transalveolar" sinus floor elevation (TSFE), which accesses the sinus floor through the crest of the edentulous ridge. Our study aims to provide a comprehensive scoping review of research conducted over the past 25 years on TSFE, specifically. A literature search aimed at identifying pertinent literature for the purpose of this PRISMA-ScR-compliant scoping review was conducted. Only randomized controlled trials, non-randomized controlled trials, prospective cohort studies, and case series that met the eligibility criteria were selected. Relevant data from these studies were extracted. Primary outcome measures included radiographic bone levels and implant failure >5 years. Secondary outcome measures included implant stability at time of placement and complications. Interventions reported in the selected studies were grouped based on treatment modality, which were then compared with the control therapy (traditional osteotome technique) after a minimum of 12 months healing period. Our search yielded 633 records, and after deduplication, 574 of these were screened. Application of the eligibility criteria led to the inclusion of 37 articles in the final selection. Case selection for included studies enrolling subjects: Four different transcrestal sinus elevation treatment modalities were identified: (a) osteotome, (b) piezoelectric surgery, (c) osseodensification, and (d) hydraulic techniques. Due to the heterogeneity of the studies, no superior approach for TSFE could be identified. Overall, all techniques demonstrated high implant survival rates. Comprehensive understanding of the patient's medical history, available armamentarium, and post-operative complications/management strategies are all essential to the completion of a successful TSFE approach for implant placement in the posterior maxilla, regardless of the treatment modality used.

Does alveolar ridge preservation reduce the need for sinus floor elevation: A comparative study to spontaneous healing.

In cases of atrophy in the maxillary posterior region, characterized by reduced vertical bone volume, implant placement becomes challenging. Augmentation procedures like sinus lifts are often needed to address insufficient bone volume. This study aims to explore if alveolar ridge preservation, using a bovine bone substitute and a porcine collagen membrane, significantly decreases the need for sinus lifts compared to natural wound healing after tooth extraction. In this comparative clinical study, 40 patients requiring a total of 53 extractions were assigned to one of the following groups: a test group with bovine bone substitute material (Straumann® XenoFlex) and a porcine collagen membrane (Jason® membrane), or a control group with spontaneous socket healing. After 6 months, digital volume tomography was performed for implant planning. For seven patients from the control group (n = 22 extracted sites) sinus lift augmentations were performed while only four sinus lift procedures were performed in the test group (n = 31 extracted sites), indicating a higher need for sinus augmentation procedures in the control group, however not statistically different on a p value of 0.05 (p = 0.168). In the control group, the mean value of the radiographically measured bone height (mesial and distal) was 11.13 ± 2.12 mm preoperatively before tooth extraction, while it was 11.3 ± 2.17 mm postoperatively after implant placement. In contrast, the mean value in the test group was 11.78 ± 3.09 mm preoperatively and 11.92 ± 2.79 mm postoperatively. Statistical analysis revealed no significant difference between the two groups (odds ratio 0.32; 95% CI: 0.08, 1.26; p = 0.951). The implant survival rate in the control group was 100%, compared to 96.77% in the test group. Within the limits of this study, the use of bovine bone substitute and a porcine resorbable membrane after tooth extraction in the posterior maxilla seems to reduce the need for sinus augmentation in comparison to spontaneous healing although the difference was not statistically significant. Additionally, the Alveolar Ridge Preservation in the test group made external sinus floor elevation unnecessary compared to the control group. The change in radiographically measured bone height pre- and postoperatively showed no significant difference between the two groups.

Complications of zygomatic implantology: observational clinical study

Background: The rehabilitation of the atrophic maxilla with zygomatic implants appears to be a complex challenge as this surgery is not without complications. For this reason, the operator approaching it must be aware of the possible surgical complications. The aim of this study was firstly to assess the incidence of complications following zygomatic implant operations performed using the intrasinus technique and to compare the data obtained with the results already present in the literature. Materials And Methods: The methods chosen for the evaluation of implant success were those reported in the article by Chrcanovic et al which refers to factors such as implant survival rate, percentage of failed implants and,incidence of post-operative complications. A total of 174 implants were included in the study. The study comprised three phases: Phase 1 -collection of the personal, anamnestic, clinical and radiological data of each patient participating in the study -detection of the number of zygomatic implants, the number of failed implants and any post- operative complications resulting from the intrasinus technique and subsequent comparison with data reported in the literature. Phase 2 -comparison of complications arising with intrasinusal and extrasinusal technique Phase 3 -administration of the satisfaction questionnaire of patients treated with the extrasinusal technique. Results: Complications occurred in 14 patients and the most frequent complication was sinusitis, followed by soft tissue infections, 3 implants failed. Specifically, the most frequent complication related to intrasinusal technique surgery is sinusitis, caused by invasion of the Higmoro antrum by the implant. Frequency analysis of the patient questionnaire shows high satisfaction with implant-prosthetic rehabilitation with zygomatic implants. Patients appear very satisfied with the aesthetics and functionality provided by the rehabilitation. Conclusion: Zygomatic implants allow the fixed rehabilitation of patients with severe upper jaw atrophies, and although complications may occur, patient satisfaction was very high as it allows them to fully recover aesthetics and function, facilitating a rapid return to social life.

Continuous periprosthetic bone loss around the TOP® cup and inferior survival rate at an 8-year follow-up: a prospective cohort study

BackgroundThe trabeculae-oriented pattern (TOP®) cup was designed to minimize acetabular periprosthetic bone loss. In our previous prospective study comprising 30 patients with a two-year follow-up we found a substantial decrease in periprosthetic bone mineral density (pBMD) in the proximal and medial regions of the TOP cup. The present study aims to investigate pBMD changes in the mid-term and how this affects implant survival.MethodsWe followed the previous cohort and estimated implant survival by Kaplan-Meier analysis, evaluated pBMD with dual-energy X-ray absorptiometry (DXA) and clinical outcome using the Harris Hip Score (HHS).ResultsMean follow-up was 8.6 (range 7.8–9.1) years. The eight-year implant survival rate for cup revision for all reasons was 83% (95% confidence interval {CI}: 70–97) and 86% (CI: 74–99) when cup revision due to aseptic loosening was the endpoint. Mean HHS at eight years was 95 (range 77–100). A further 12% (CI: 5–17) loss in pBMD was detected in the proximal Digas zone 1 and 12% (CI: 7–17) loss in Digas zone 2 also between two and eight years after surgery. pBMD continued to decrease up to 30% (CI: 24–36) in Digas zones 1, 2 and 3 compared to pBMD immediately postoperatively.ConclusionsThe TOP cup shows inferior mid-term survival rates compared to other uncemented cups, as well as a continuous decrease in pBMD. Periprosthetic bone loss cannot be prevented by this uncemented cup.Clinical trial numberNot applicable.

Association of osteotomy, age, and component fixation with the outcomes of total hip arthroplasty in patients with hip dysplasia: a Dutch population-based registry study.

Hip dysplasia can present challenges for total hip arthroplasty (THA) due to anatomic abnormalities. We aimed to assess the association of age, sex, osteotomies prior to THA, and fixation method on 5- and 10-year revision-free implant survival and patient-reported outcome measures (PROMs) of THAs in patients with hip dysplasia. Using Dutch Arthroplasty Register data, we studied hip dysplasia patients receiving primary THAs in 2007-2021 (n = 7,465). THAs were categorized by age, pelvic osteotomy prior to THA (yes/no), and fixation (cemented, uncemented, hybrid, reverse hybrid). Kaplan-Meier and multivariable Cox models were used to determine 5- and 10-year revision-free implant survival and adjusted hazard ratios including 95% confidence intervals (CIs). Reasons for revision and PROMs were compared within the categories. We found a 10-year revision-free implant survival of 94.9% (CI 94.3-95.5). Patients younger than 50 years had a 10-year implant survival of 93.3% (CI 91.9-94.7), Patients with prior pelvic osteotomy had a 10-year implant survival of 92.0% (CI 89.8-94.2). Fixation method and sex were not associated with implant survival. Patients with a prior pelvic osteotomy had more revisions due to cup loosening and reported lower PROM scores than patients without earlier osteotomy. 5- and 10-year revision-free implant survival rates of THA for hip dysplasia are 96.4% and 94.9%. Age and prior osteotomies were associated with decreased implant survival rates in patients with hip dysplasia, while fixation method was not. Prior osteotomies were also associated with reduced PROM scores.