Distal Marginal Bone Loss Research Articles

Clinical Performance of Extra-Short (≤5.5 mm) Compared to Longer Implants Splinted under the Same Prosthesis: A Randomized Clinical Trial.

Objective: This randomized controlled split-mouth trial compared the performance of 5.5 mm length implants (test group; TG) splinted within the same fixed prosthesis as longer implants (≥6.5 mm; control group; CG) in posterior regions. Methods: The primary hypothesis was that implant length does not affect marginal bone loss (MBL) one year post-implantation, while the secondary hypotheses included implant survival, peri-implant clinical variables, and prosthetic complications. Fifteen patients (eight males, seven females) with a mean age of 67 ± 9 years were included. Results: No significant difference in the implant position between groups (p = 0.808) was observed. Implant diameters ranged from 3.00 to 4.25 mm, and the most common bone type was type I (67%). Bone density (p = 0.574) and implant insertion torque (p = 0.888) were similar between groups. Mesial MBL (mean: -0.1; range: -1.19 to 0.24 for TG, and -0.03; -1.75 to 0.45 for CG; p = 0.955) and distal MBL (mean: -0.05; range: -1.41 to 0.27 for TG, and 0.08; -1.45 to 0.72 for CG; p = 0.118) did not show statistical differences. There were no implant failures or technical complications. Conclusions: These findings suggest that 5.5 mm length implants could be a viable option for use in posterior regions, providing similar clinical outcomes to longer implants one year post-implantation.

Iliac crest vertical block grafts -placing outside or inside the bone contour: A cohort study.

Challenging defect configurations and dimensions arise from severe, localized vertical alveolar ridge defects caused by trauma or prior surgery. This study aims to analyze three-dimensional bone gain, assess marginal bone stability in such defect configurations, and evaluate the impact of grafting outside the bone contour on the overall outcome, with a focus on iliac crest block grafts as a valid treatment option. The prospective cohort study evaluated patients who required vertical block grafting due to localized bone defects in the maxilla or mandible and who had received iliac grafts. Three-dimensional bone gain was analyzed using cone beam computed tomography (CBCT) after 3 months of bone healing for each treated site and implant position. A comparison between bone grafts inside and outside the bone contour was conducted. Marginal bone stability was measured using intraoral radiographs during routine annual follow-up visits. Seventy patients with 89 treated sites were evaluated. After 3 months of graft healing, the mean vertical bone gain was 11.03 ± 3.54 mm, the mean horizontal bone gain was 7.18 ± 2.00 mm, and the mean graft length was 28.19 ± 11.01 mm. A total of 217 implants were placed in the augmented regions. On implant level, a mean vertical bone gain of 10.44 ± 3.44 mm and a mean horizontal bone gain of 6.54 ± 1.86 mm were measured. Over a 43-month observation period, mesial and distal marginal bone loss averaged 0.44 ± 0.92 mm and 0.49 ± 1.05 mm, respectively. Eight implants were diagnosed with periimplantitis, resulting in the loss of four implants, while no early implant losses were reported. Within the limitations of this study, vertical bone grafts with iliac crest block grafts were found to be a dependable treatment option for dental implant placement, and placing block grafts outside the bone contour did not lead to inferior outcomes.

The cumulative survival rate of sandblasted, large-grit, acid-etched dental implants: a retrospective analysis.

This retrospective study aimed to assess the long-term cumulative survival rate of titanium, sandblasted, large-grit, acid-etched implants over a 10-year follow-up period and investigate the factors affecting the survival rate and change in marginal bone loss (MBL). The study included 400 patients who underwent dental implant placement at the Department of Periodontology of Seoul National University Dental Hospital (SNUDH) between 2005 and 2015. Panoramic radiographic images and dental records of patients were collected and examined using Kaplan-Meier analysis, Cox proportional hazards regression analysis, and multiple regression analysis to determine the survival rates and identify any factors related to implant failure and MBL. A total of 782 implants were placed with a follow-up period ranging from 0 to 16 years (mean: 8.21±3.75 years). Overall, 25 implants were lost, resulting in a cumulative survival rate of 96.8%. Comparisons of the research variables regarding cumulative survival rate mostly yielded insignificant results. The mean mesial and distal MBLs were 1.85±2.31 mm and 1.59±2.03 mm, respectively. Factors influencing these values included age, diabetes mellitus (DM), jaw location, implant diameter, bone augmentation surgery, and prosthetic unit. This study found that the implant survival rates at SNUDH fell within the acceptable published criteria. The patients' sex, age, DM status, implant location, implant design, implant size, surgical type, bone augmentation, and prosthetic unit had no discernible influence on long-term implant survival. Sandblasted, large-grit, acid-etched implants might offer advantages in terms of implant longevity and consistent clinical outcomes.

Prosthesis Emergence Angle Influences Marginal Bone Level for External Connection Implants: A Cross-Sectional Study.

To retrospectively evaluate the influence of prosthetic features on marginal bone level changes around bone-level implants with an external hex connection. A total of 100 patients with 166 implants and cemented crowns were included. Demographic and clinical data were collected. Prosthetic features were radiographically evaluated, including emergence angle (EA), emergence profile (EP), crown-implant ratio (CIR), and abutment height. Marginal bone levels were measured on intraoral radiographs taken at baseline and after at least 1 year. The correlation between prosthetic features and marginal bone loss (MBL) was then investigated. The mean follow-up time was 43.94 months. Implant length varied between 5 and 13 mm. The mean height of the abutments used was 1.55 mm. EA measured an average 30.62 degrees (± 13.20) mesially and 29.45 degrees (± 13.07) distally. The CIR was 0.99 (± 0.26). The mean MBL was 0.19 mm on the mesial side and 0.20 mm on distal side of the implants. Significant positive associations emerged between MBL and implant length (P < .005) and with EA (P < .05). A convex profile of the crown was shown to be associated with a higher distal MBL (P = .025) compared to concave and straight profiles.

COMPARATIVE EVALUATION OF CRESTAL BONE LOSS AROUND SUBMERGED AND NON-SUBMERGED IMPLANTS WITH DIFFERENT TYPES OF HEALING ABUTMENT DESIGNS - AN IN VIVO STUDY

Successful osseointegration is observed predictably for submerged implants requiring a two-stage procedure as well as for non-submerged implants characterized by one-stage surgical procedure. This study was aimed at evaluating and comparing crestal bone alterations around submerged and non-submerged implant radiographically. Total 45 patients aged between 20 to 50 years with missing mandibular posterior teeth were divided into 3 groups [Submerged implants (n=15), Non-submerged implants with anatomic healing abutment (n=15) and Non-submerged implants with esthetic healing abutment (n=15)]. Radiographic evaluation of mesial and distal marginal bone loss was done at 1 month and 3 months. Statistically significant differences were found between submerged dental implants and non-submerged dental implants with anatomical type of healing abutment designs (P &lt; 0.001) and between the two non-submerged dental implant groups with different types of healing abutments (P &lt; 0.001) at 1 month and 3 months. But there was no statistically significant difference between submerged dental implants and non-submerged dental implants with esthetic type of healing abutments (P &gt; 0.05) at 1 month and 3 months. It was concluded from this study that bone resorption during the osseointegration period using the non-submerged technique varied significantly depending on the morphology of the healing abutment used. The non-submerged technique with an esthetic healing abutment produced an equally predictable outcome compared with the submerged technique.

Influence of supracrestal tissue height on peri-implant hard and soft tissues of single implants placed in the esthetic areas using one abutment-one time approach: A pilot, prospective interventional study.

This pilot, prospective interventional study aimed to analyze the influence of supracrestal tissue height (STH) when using the one abutment-one time concept (OAOT) at the time of implant placement, on peri-implant hard and soft tissue remodeling in esthetic areas. The definitive crown was placed seven days later. Facial mucosal margin position (FMMP), mesial and distal papilla levels (MPL and DPL, respectively), and mesial and distal marginal bone loss (M-MBL and D-MBL, respectively) were assessed after seven days (placement of the definitive crown), and 1, 2, 3, 6 and 12 months after implant placement. Patients were classified according to the STH in thin (STH < 3 mm) and thick (STH ≥ 3 mm). Fifteen patients fulfilled the eligibility criteria and were included in the study. Eight presented a thick STH and seven a thin STH. After 12 months, the implant success rate was 100%. The mean recession at FMMP was -0.47 ± 0.57 mm and -0.19 ± 0.41 mm in thin and thick groups, respectively (p = 0.29). The mean MPL recession was -0.19 ± 0.06 mm in the thin group and -0.01 ± 0.07 mm in the thick group (p < 0.01), and the mean DPL recession was -0.15 ± 0.09 mm in the thin group and 0.00 ± 0.15 mm in the thick group (p < 0.05). The mean bone loss was -0.21 ± 0.18 mm and -0.04 ± 0.14 mm in the thin and thick groups, respectively (p < 0.05). Single maxillary anterior implants with thin supracrestal tissue height (< 3 mm) at the time of implant placement had greater bone loss and papillary recession than implants with a thick soft tissue height (≥ 3 mm), even when using the one abutment one time concept.

Comparison of Periodontal Health and Marginal Bone Loss in Mandibular First Molar Single-Crown Dental Implants Placed in Different Positions

The aim of the present study is to compare the periodontal health and marginal bone loss (MBL) between single-crown dental implants placed interdentally and mesial to the edentulous space. Patients treated with single-crown dental implants between 01/04/2014 and 01/04/2021 were included in the study. The included patients were divided into 2 groups. Group 1 consisted of single implant crowns inserted interdentally with a distal neighboring mandibular second molar and Group 2 consisted of single molar implant crowns inserted distally to the second premolar tooth without a neighboring second molar. The measurements for probing pocket depth, gingival index, and plaque index were made in both groups at the 60-month control session to evaluate periodontal health of the single-crown dental implants. The marginal bone levels of distal and mesial aspects of all implants were measured at the 60-month control session on panoramic radiographs. Forty-six and sixty-one patients were included in Groups 1 and 2, respectively. There was a significantly higher distal MBL in Group 2 compared with Group 1 (&lt;i&gt;P&lt;/i&gt; &amp;#60; 0.05). Mesial MBL was higher in Group 1, however, this difference was not significant. The periodontal parameters of probing pocket depth, gingival index, and PI were all significantly higher in Group 1 compared with Group 2 at the 60-month control evaluation (&lt;i&gt;P&lt;/i&gt; &amp;#60; 0.05). Single-crown dental implants placed interdentally may show decreased distal MBL and periodontal health compared with single-crown dental implants placed mesial to the edentulous space.

Radiographic outcomes of lateral sinus floor elevation with and without bone window repositioning: one-year results of a randomized controlled trial

The objective of this study was to perform a comparative evaluation of the radiographic outcomes of lateral sinus floor elevation with and without bone window repositioning (BLSFE and LSFE, respectively) when applied concomitantly with implant placement. A randomized controlled clinical trial was conducted between February 1, 2016 and May 1, 2017 including 26 individuals with at least one missing tooth. Participants were randomized 1:1 to undergo BLSFE (10 participants, 16 implants) or LSFE (13 participants, 19 implants). Bovine-derived xenograft was used in both groups and the implants were inserted concomitantly. In the BLSFE group, the antrostomy was covered with a repositioned bone window and then with a concentrated growth factors (CGF) membrane. In the LSFE group, the antrostomy was covered with a CGF membrane. Panoramic radiographs were taken before surgery (T0), immediately postoperative (T1), and at 12 months postoperative (6 months after loading) (T2). Marginal bone loss (MBL), apical bone gain, augmented alveolar bone height, and intra-sinus bone augmentation were evaluated on panoramic radiographs at T2. A linear regression analysis with generalized estimating equation models was performed. The implant survival rate was 100% at 1 year after implant surgery. The residual alveolar bone height at T0 was comparable in the BLSFE and LSFE groups (3.58 ± 1.49 mm vs 4.12 ± 1.61, P = 0.32), as was the alveolar bone height at T1 (13.61 ± 1.82 mm vs 12.38 ± 1.82 mm, P = 0.06). At T2, significantly higher alveolar bone height, intra-sinus bone augmentation, and apical bone gain, and lower distal MBL were observed in the BLSFE group when compared to the LSFE group, with adjusting for covariates (β = 2.44, 95% CI 1.42–3.46, P < 0.0001; β = 2.38, 95% CI 1.35–3.41, P < 0.0001; β = 2.33, 95% CI 1.23–3.42, P < 0.0001; and β = −0.43, 95% CI −0.83 to −0.02, P = 0.038, respectively). No significant difference was observed for mesial MBL or apical bone resorption at T2. Lateral sinus floor elevation with bone window repositioning may result in higher bone augmentation after 1 year than the traditional approach. Further research is needed to elucidate the effect of lateral sinus floor elevation with bone window repositioning.

Evaluación radiográfica retrospectiva de un año de la pérdida ósea marginal alrededor de los implantes basales y el impacto de múltiples factores de riesgo mediante análisis multivariado.

Background: Factors like medical and periodontal conditions, implant location and smoking can affect marginal bone loss (MBL) of basal implants. Objectives: The purpose of this study is to explore the association of MBL with multiple variables including gender, age, smoking status, diabetes, implant placement protocol, location of implant, and type of prosthesis. Material and Methods: A total of 156 single-piece basal implants (Dr. Ihde Dental AG in Gommiswald, Switzerland) were placed in 44 patients. Dental panoramic tomographs were obtained postoperatively and following a one-year of service to determine MBL on mesial and distal sides. The association of MBL with the multiple variables was analysed using the multivariate and the random forest analysis. Results: The mean mesial and distal MBL was 0.64 millimetres. None of the implants presented MBL exceeding 1 millimetre. All implants were retained without complications during the first year of service. The MBL was remarkably associated with the smoking status, diabetes, location of implant and implant placement protocol. Diabetes mellitus is the most vital parameter in predicting MBL. Conclusion: The mean MBL of all implants did not exceed the threshold of 1 millimetre during the first year of service. When placing implants in patients who smoke and have diabetes, care should be taken.

Periodontal Clinicoradiographic Status and Whole Saliva Soluble Urokinase Plasminogen Activation Receptor and Tumor Necrosis Factor Alpha Levels in Type-2 Diabetic and Non-diabetic Individuals.

The authors hypothesise that whole saliva soluble-urokinase-type plasminogen-activator receptor (suPAR) and tumor necrosis factor-alpha (TNF-α) levels are higher in patients with poorly-controlled than well-controlled type-2 diabetes mellitus (DM) and non-diabetic controls. The aim was to assess the periodontal clinicoradiographic status and whole-salivary suPAR and TNF-α levels in type-2 diabetic and non-diabetic individuals. Patients with and without type-2 DM were included. In all patients, hemoglobin A1c (HbA1c) levels were measured. Participants were divided into 4 groups. Group 1: patients with poorly controlled type-2 DM; group 2: patients with well-controlled type-2 DM; group 3: non-diabetic patients with periodontitis; group 4: non-diabetic patients without periodontitis. Clinicoradiographic periodontal parameters (plaque index [PI], gingival index [GI], clinical attachment loss [AL], probing depth [PD] and mesial and distal marginal bone loss [MBL]) were measured. The whole saliva total protein concentration (TPC) and suPAR as well as TNF-α levels were measured. The level of statistical significance was set at p < 0.01. One hundred patients (25 patients per group) were included. Scores of PI (p < 0.01), GI (p < 0.01), clinical AL (p < 0.01), PD (p < 0.01), number of missing teeth and mesial (p < 0.01) and distal (p < 0.01) MBL were statistically significantly higher in group 1 than in groups 2-4. Scores of PI, GI, clinical AL, PD, mesial and distal MBL, and numbers of missing teeth were higher in group 3 (p < 0.01) than in groups 2 and 4. The whole saliva TPC, suPAR and TNF-α levels were statistically significantly higher among patients in group 1 (p < 0.01) than in groups 2-4. Patients with poorly-controlled type-2 DM presented with poorer clinicoradiographic periodontal status and increased whole saliva levels of suPAR, TNF-α and TPC compared with patients with well-controlled type-2 DM and non-diabetic individuals.

Clinical and radiographic evaluation of jumping distance management using a collagen matrix in flapless immediate implant placement.

Improvement in implant design has made implant dentistry a challenging treatment modality worldwide. This study aimed to investigate the efficacy of a xenogeneic collagen matrix in managing 3-4-millimeter gaps in flapless immediate implant placement. Twenty-two patients received 39 immediate implants via the flapless approach. Patients with intact bony walls, buccal bone thickness ≥2 mm and a jumping distance of 3-4 mm were included in this study. The gap between the implant and the socket walls was filled with a xenogeneic collagen matrix (Collacone®). The final clinical and radiographic evaluations were performed at least 24 months following functional loading. There was no early or late failure, and the implants showed a 100% survival rate. The mean mesial (0.28 ±0.39 mm) and distal (0.28 ±0.39 mm) marginal bone loss (MBL) at the site of incisors was not significantly different from the values at the site of premolars and molars (0.30 ±0.42 mm and 0.34 ±0.48 mm, respectively). The evaluation of the implant success index (ISI) score revealed no difference between the mandible and the maxilla (p = 0.700), or incisors compared with premolars and molars (p = 0.420). The only significant difference was in terms of distal MBL, which was higher in the maxilla (0.39 ±0.49 mm) than in the mandible (0.12 ±0.23 mm) (p = 0.040). Within the limitations of this study, it seems that the application of a xenogeneic collagen matrix to manage 3-4-millimeter gaps in carefully selected cases may bring promising outcomes.

Application of digital technique aided occlusal rehabilitation in implant-supported fixed prosthesis of fully edentulous patients

Objective: To evaluate the clinical outcomes of digital technique-aided occlusal rehabilitation based on implant-supported fixed prostheses (ISFP), and to provide some information for clinical application of digital technique. Methods: Retrospectively reviewed the cases which had used neuromuscular system and condylar movement tracing device to reconstruct occlusion in one or double jaw fully edentulous ISFP from January, 2013 to January, 2020. A total of 6 eligible patients were enrolled in the present study with 56 implants and 8 ISFP, including 4 male patients and 2 female patients, aged from 43 to 74 years. The clinical outcomes were evaluated in four aspects, including implant survival rate, implants success rate, marginal bone loss and the occurrence of prosthesis complications. Results: The follow-up time was (4.0±2.2) years (1-7 years). The implant survival rate was 100% (56/56) and the implant success rate was 98% (55/56), with an average missal and distal marginal bone loss of (0.04±0.11) mm/year. Veneer chipping occurred at incisal edge of 2 adjacent incisors in only one prosthesis 3 years after rehabilitation. Conclusions: Combination of digital techniques of neuromuscular system and condylar movement tracing device to assist occlusal rehabilitation based on ISFP showed a high implant success rate. The complication seldom happened. Long and stable occlusion has been observed. The clinical outcomes were favorable.

Efficacy of Scaling and Root Planing with Photobiomodulation for Treating Periodontitis in Gutka Chewers: A Randomized Controlled Trial

Objective: To explore the influence of photobiomodulation (PBMT) as an adjuvant to scaling and root planing (SRP) for treating periodontitis among gutka chewers. Materials and methods: Self-reported smokeless-tobacco (gutka) users were enrolled; and underwent SRP with (test group) and without (control group) PBMT. Full-mouth plaque index (P-I), bleeding upon probing (BUP), probing depth (P-D) clinical attachment loss (CAL), marginal bone loss (MBL) (on mesial and distal surfaces of the teeth), and number of missing teeth were recorded before treatment and at 3 and 6 months. Group comparisons were performed and p < 0.05 was referred significant. Results: In the control group, P-I (p < 0.013), BUP (p < 0.001), and P-D (p < 0.012) were high at baseline compared with 3 months follow-up. P-I, BUP, and P-D were higher in the test group, at baseline in comparison with the 3-month (p < 0.001) and 6-month (p < 0.01) follow-up. At 3 and 6 months, scores of P-I, BUP, and P-D were high in the control compared with the test group. No difference in CAL, and mesial and distal MBL was found among patients of both groups at 3 and 6 months. Conclusions: Among gutka chewers, SRP with PBMT is more efficient than SRP alone in the management of periodontitis.

The influence of titanium base abutments on peri-implant soft tissue inflammatory parameters and marginal bone loss: A randomized clinical trial.

Some techniques in implant dentistry have been suggested that may potentially alter peri-implant soft and hard tissue parameters. To evaluate the peri-implant soft tissue inflammatory parameters and crestal bone loss around titanium base abutments. Fifty two implants were placed in 21 patients and restored by single crowns. Subjects were randomly allocated into two groups: cement-retained abutment (n = 24) and titanium base (n = 28). Peri-implant probing depth, and mesial and distal marginal bone loss (MBL) were evaluated at implant loading (T1), 6 and 12 months (T2 and T3, respectively). Peri-implant bleeding-on-probing was evaluated at T2 and T3. Two-way repeated measures analysis of variance, Tukey test, Man Whitney, and Pearson correlation were performed for statistical analysis at P < .05. The mean difference of peri-implant MBL from implant installation to 12 months in function was 1.15 ± 0.82 mm for the cement-retained group, and 1.23 ± 0.79 mm for the titanium base group. No statistically significant difference was found between the two groups for clinical and radiographic peri-implant evaluation. Titanium base abutments present no negative effect on peri-implant soft tissue and MBL. When used to support single crowns, both approaches performed likewise regarding clinical and radiographic parameters.

Effects of implant-related variables on the marginal bone loss around dental implants.

Marginal bone loss (MBL), a prognostic parameter for implant success, is associated with implant- and patient-related variables. The purpose of this study was to analyze the effects of the crown-to-implant ratio and independent factors of implant diameter, implant length, implant type, location, and platform switching on distal and mesial MBLs at the 6-, 12-, 24-, and 36-month recall sessions of single crown implant-supported restorations. Radiographic and clinical data of patients treated with single crown implants were collected. MBL was measured at the baseline and recall sessions on panoramic radiographs. The crown-to-implant ratio was calculated by dividing the length of the crown by that of the dental implant. The crown-to-implant ratio had a moderately positive correlation with distal MBL at the 6-month recall session (P < .05, r = 0.469) and a weakly positive correlation at the 12- (P < .05, r = 0.220), 24- (P < .05, r = 0.214), and 36- (P < .05, r = 0.250) month recall sessions. Distal and mesial MBL did not significantly differ among the four implant types at any recall session (P > .05). The crown-to-implant ratio had no significant correlation with mesial MBL at the 12-, 24-, or 36-month recall session (P > .05), and a moderately positive correlation at the 6-month recall session (P < .001, r = 0.434). MBL was similar among different implant types in the short and medium terms. There was a positive correlation between distal MBL and the crown-to-implant ratio.

Retrospective evaluation of marginal bone loss around implants in a mandibular locator-retained denture using panoramic radiographic images and finite element analysis: A pilot study.

The follow-up of the peri-implant marginal bone loss is the most important criterion for the determination of implant success. The purpose of this study is to measure marginal bone loss using panoramic radiographic images (PRI) of patients treated using a mandibular, two implant-supported, locator-retained denture and to evaluate the compatibility of these findings with those of the finite element analysis (FEA). The PRI of patients who had a mandibular, two implant-supported, locator-retained denture were assessed, and the mesial and distal marginal bone loss of both right- and left-sided implants was measured. Mandibular and maxillary models, which have the features of bilateral balanced occlusion, were created. The surfaces of the generated models were converted in a computer-aided design model that could be transferred to the FEA software, and the forces were defined on contacts formed in maximum intercuspation, lateral, and protrusive movement position for bilateral balanced occlusion. The bone loss in the mesial and distal regions at the right- and left-sided implants was not statistically significant. Higher stresses were formed on the vestibular side under protrusive movement, on the lingual side under maximum intercuspation, on the distolingual side under left unilateral biting, and on the mesiolingual side under right unilateral biting in the FEA. According to FEA, peri-implant bone resorption may be higher in the buccal and palatal regions, implying that panoramic radiographs can be misleading in understanding the amount of peri-implant bone resorption.

Radiographic Evaluation of Crestal Bone Levels of Delayed Single Implants with Two Different Neck Designs in the Posterior Maxilla: A Clinical Study

Objectives: This study was conducted to compare the early radiographic bone level changes around delayed single implants in the posterior maxilla with different beveled smooth collar heights.Materials and Methods: Thirteen patients with a missing posterior tooth in the maxilla were randomly allocated to be treated with an implant with either a beveled 1.5 mm smooth collar or a beveled 0.3mm smooth collar. Implants were installed in healed sites and were loaded after 4 months. Follow-up visits were conducted 4 and 10 months after implant placement.Results: Assessment of marginal bone levels showed Non-Significant (P-value = 0.05) differences in mesial and distal marginal bone level mean values between both groups within each follow-up period. Assessment of marginal bone loss showed Non-Significant (P-value = 0.05) differences in mesial and distal marginal bone loss mean values between both groups within each time interval.Conclusion: For posterior tooth replacements, implants with different smooth collar heights showed similar and favorable radiographic outcomes with acceptable marginal bone loss after 6 months of loading.

Clinical Performance of Short Dental Implants Supporting Single Crown Restoration in the Molar-Premolar Region: Cement Versus Screw Retention.

This study assessed the survival and marginal bone loss of single-unit short implants (≤ 8 mm in length) in the premolar-molar area. It also compared cemented with screw-retained restoration. In this clinical retrospective study, short implants supporting a single crown in the premolar-molar region were selected. Demographic-, surgical-, implant-, and prosthesis-related data were obtained. The predictor variable was the type of prosthesis retention. The principal variables were survival rate and marginal bone loss. The secondary variables were prosthesis survival and technical and biologic complications. A total of 113 patients (56 ± 11 years of age) with 128 short implants were assessed. The mean follow-up time from implant insertion was 25.47 ± 14.95 months. Fifty-one crowns were cemented and 77 were screw-retained. No failure events were recorded for the implants and the prostheses. The distal marginal bone loss was significantly lower in the screw-retained crowns than in the cemented crowns. Marginal bone loss ≥ 2 mm as a biologic complication was more frequent in the cemented crowns. Two screw-loosening events were observed in the screw-retained restorations. These events were resolved by screw retightening. Short implants could be an effective option to support a single-unit prosthesis in the premolar-molar areas of the maxillae.

Self-perceived oral symptoms and periodontal status among young intravenous heroin addicts: A cross-sectional case-control study.

It is hypothesized that (a) self-perceived oral symptoms (OSs) are worse in intravenous heroin addicts (IHA) than controls; and (b) clinical periodontal inflammatory parameters (plaque index [PI], bleeding on probing [BOP], PD and clinical attachment loss [AL]), number of missing teeth (MT), and radiographic marginal bone loss (MBL) are higher in IHA compared with controls. The aim was to compare the self-perceived OSs and periodontal parameters among young IHA and controls. Sociodemographic data, self-perceived OSs and duration and daily frequency of intravenous heroin use was gathered using a structured questionnaire. Full-mouth PI, BOP, PD, and clinical AL were measured, and number of MT were recorded. Mesial and distal MBL on all teeth was measured on digital radiographs. Odds ratios (OR) with 95% confidence intervals (CI) were computed for self-perceived OSs and periodontal parameters were assessed using the Mann Whitney U-test and logistic regression analysis. Sample-size was estimated, and level of significance was set at P<0.05. OR (95% CI) for self-perceived loose teeth (P<0.001), pain in teeth (P<0.001), dry mouth (P<0.001), burning sensation in mouth (P<0.001), bleeding gums (P<0.001) and pain during chewing (P<0.001) were significantly higher in the test than control group. Number of MT (P<0.05), PI (P<0.05), clinical AL (P<0.05), and mesial (P<0.05) and distal (P<0.05) MBL were statistically significantly higher among individuals in the test group compared with the control group. Self-perceived OSs and periodontal inflammatory parameters were worse in IHA than controls.

Minimum Abutment Height to Eliminate Bone Loss: Influence of Implant Neck Design and Platform Switching.

This retrospective study quantitatively analyzed the minimum prosthetic abutment height to eliminate bone loss after 4.7-mm-diameter implant placement in maxillary bone and how grafting techniques can affect the marginal bone loss in implants placed in maxillary areas. Two different implant types with a similar neck design were singularly placed in two groups of patients: the test group, with platform-switched implants, and the control group, with conventional (non-platform-switched) implants. Patients requiring bone augmentation underwent unilateral sinus augmentation using a transcrestal technique with mineralized xenograft. Radiographs were taken immediately after implant placement, after delivery of the prosthetic restoration, and after 12 months of loading. The average mesial and distal marginal bone loss of the control group (25 patients) was significantly more than twice that of the test group (26 patients), while their average abutment height was similar. Linear regression analysis highlighted a statistically significant inverse relationship between marginal bone loss and abutment height in both groups; however, the intercept of the regression line, both mesially and distally, was 50% lower for the test group than for the control group. The marginal bone loss was annulled with an abutment height of 2.5 mm for the test group and 3.0 mm for the control group. No statistically significant differences were found regarding marginal bone loss of implants placed in native maxillary bone compared with those placed in the grafted areas. The results suggest that the shorter the abutment height, the greater the marginal bone loss in cement-retained prostheses. Abutment height showed a greater influence in platform-switched than in non-platform-switched implants on the limitation of marginal bone loss.