Long-term Implant Survival Rate Research Articles

Analysis of Postoperative Complication and Revision Rates and Mid- to Long-Term Implant Survival in Primary Short-Stem Total Hip Arthroplasty.

Background/Objectives: Short-stem prostheses were introduced as an alternative to conventional straight-stem prostheses. Despite their benefits, including minimally invasive approaches, soft-tissue- and bone-sparing implantation, and physiological load transfer to the metaphysis, data on postoperative complication and revision rates as well as on implant survival are scarce. Methods: A retrospective analysis of 1327 patients who underwent primary total hip arthroplasty (THA) using the Metha® short stem between 2006 and 2023 was conducted. Complication and revision rates were analysed for the intraoperative, direct postoperative, and follow-up episodes. Implant survival was analysed with the endpoint of all-cause stem revision. Results: Intraoperative complications were observed in 3.77% of the cases and included 44 hairline cracks and 6 fractures. In 15 cases (30.0%), conversion to a straight-stem or revision implant was necessary. The direct postoperative complication rate was 2.44%, and 11 revision procedures were performed during inpatient stay (0.84%). Mean follow-up was 7 years (range 1-17). During follow-up, femoral component revision was performed in 60 cases. Aseptic loosening and stem subsidence accounted for a combined percentage of 80% of all indications. Implant survival rate was 95.66% after 5 years, 95.58% after 10 years, and 95.50% after 15 years. Conclusions: Our study provides a comprehensive analysis of postoperative complication and revision rates in a large sample undergoing primary short-stem THA. Postoperative complication rates were favourable, and the long-term implant survival rates were comparable to conventional straight-stem prostheses. Therefore, short-stem THA may be considered an alternative for younger patients.

Implant survival rate and marginal bone loss of 174 implants with different variables associated over a minimum observational period of 20 years: A retrospective study.

To investigate the long-term implant survival rate and marginal bone loss (MBL) of implants with different variables associated over an observational period of at least 20 years. Patients with at least one implant placed prior to 2001 were recalled and visited. Data on implant macro-design, prosthetic aspects, site distribution, and patient-related factors were collected. MBL was evaluated on intraoral X-rays and peri-implant soft tissue parameters were recorded. The patients were asked to fill out a questionnaire to evaluate their satisfaction with the treatment received. Descriptive statistics indicators were estimated. Analysis of variance and analysis of covariance models were used to investigate any differences in the MBL and peri-implant probing depth (PPD) among the variables. A chi-square analysis was performed to investigate any association between different types of prosthetic implant-supported rehabilitations and survival/success outcomes. Forty-one (41) patients and 174 implants were included with a mean observational period of 23.3±2.8 years. The implant survival and success rates were 96.5% and 83.3% respectively, while 3.5% of early failures were detected. The lowest success rates were observed for implants supporting fixed full-arch rehabilitations (71.05%) and overdenture rehabilitations (86.11%). A mean MBL of 1.81±0.71mm and a mean PPD of 3.38±1.62mm were recorded. The interaction between the collected data with MBL and PPD did not reveal any statistically significant differences between the variables (p>0.05). A statistically significant difference was recorded when analyzing the association between the different types of prosthetic implant-supported rehabilitations and success rates (p=0.014), with fixed and removable full-arch rehabilitations presenting with lower success rates. Answers to the questionnaire showed a generally high level of satisfaction. Within the limits of this retrospective study and based on the results, an implant survival rate higher than 96% was observed after a mean observational period of 23.3±2.8 years. Both the implant survival rate and MBL seemed stable after a mean observational period of 23.3±2.8 years. Implants supporting fixed and removable full-arch rehabilitations seemed to present lower success rates over time. Implant rehabilitation seemed to provide patients with optimal long-term outcomes in terms of functional and psychological aspects.

PREVENTION AND MANAGEMENT OF INTRA-OPERATIVE COMPLICATIONS IN MAXILLARY SINUS AUGMENTATION USING THE LATERAL APPROACH? A REVIEW

The lateral approac for maxillary sinus grafting has become a routine technique with an implant survival rate over 96% in the maxillary posterior region. However, this technique may be associated with some complications that may occur at different time points and influence short and long-term implant survival rate. This article is dedicated to intra operative complications which are mainly due to anatomical variations such as the shape of the sinus, the presence of septa and other particularities such as the intraosseous passage of the antral alveolar artery which may interfere with the position of the vestibular window. In order to identify the risk and prevent the complications, a perfect knowledge of the anatomy is therefore essential. If a complication does occur, it must be treated in an efficient manner to prevent the postoperative complications that may follow, in the form of chronic or acute sinusitis. The prevalence of intra operative complications is conversely proportional to the surgeon’s skill and experience without an influence on implant survival if they are properly managed.

Does a Severely Resorbed Subantral Ridge Decrease Long-Term Implant Survival Rate with Sinus Floor Augmentation?

To identify the impact of residual bone height on 5-year implant survival and prosthetic complication rates in patients who underwent maxillary sinus grafting. A total of 87 consecutive patients were treated with 104 lateral approach maxillary sinus floor augmentation procedures with 100% deproteinized bovine bone and received 169 implants. The analysis considered patient age, sex, time of implant placement, and residual bone height. Patients with < 3 mm residual bone height were assigned to the study group; otherwise, they were placed in the control group. The mean follow-up was 68.2 months (0 to 103 months). The mean residual bone height was 1.8 mm in the study group and 4.1 mm in the control group. The 5-year implant survival and prosthetic complication rates were, respectively, 97.4% and 8.0% in the study group and 100% and 12.5% in the control group. Residual bone height, sex, age, and time of implant placement were not significant factors for the 5-year implant survival or prosthetic complication rate. The lateral bone wall was significantly thinner in the study group. The grafted bone height reduction was significantly different at 6 months and 2 years postoperation in both groups, but there was no difference in the change in grafted bone height reduction over time between the two groups. A residual bone height < 3 mm did not impact the survival rates of implants placed in grafted maxillary sinuses or the prosthetic complication rate after 5 years of functional loading.

Тотальное эндопротезирование тазобедренного сустава в течение последних 25 лет

Тотальное эндопротезирование тазобедренного сустава (ТЭТС) является одной из наиболее клинически эффективных и экономически целесообразных ортопедических процедур в течение последних пяти десятилетий. Прочность фиксации цементной бедренной ножки остается стандартом, с которым сравнивают все современные методы фиксации. Выживание ножек составило 82 % при 20-летнем периоде и 81 % при 30-летнем. При этом выживание ацетабулярных чашек составило 71 и 52 % соответственно. В североамериканском регистре больных с протезированием тазобедренного и коленного суставов использование цементных чашек уменьшилось с 12 % в 1995 году до 7,8 % в 2001 году. Клинические данные не указывают на стойкие клинические преимущества методов малоинвазивной хирургии (Minimally Invasive Surgery, MIS) по сравнению с традиционными хирургическими доступами. Нередко встречаются серьезные осложнения, связанные с использованием данного метода. В последнее десятилетие наблюдается резкое снижение частоты клинического использования методов MIS при ТЭТС. В период с 1993 года во всем мире наблюдалось последовательное увеличение объемов поверхностного эндопротезирования тазобедренного сустава. До 2008 года поверхностное эндопротезирование тазобедренного сустава составляло 6–9 % от всех ТЭТС. Несмотря на заинтересованность больных поверхностным эндопротезированием, боязнь осложнений и выживание имплантатов в длительной перспективе, а также неизвестные последствия влияния ионов металлов и связанные с ними неблагоприятные тканевые реакции привели к сокращению количества поверхностного эндопротезирования тазобедренного сустава в большинстве стран. Инновации в области обработки полиэтилена привели к улучшению его износостойких характеристик. Идеальный полиэтиленовый материал должен иметь высокую плотность поперечных связей (крепкая межмолекулярная связь) и низкий потенциал окисления. Это достигается за счет увеличения дозы облучения, которая подается на полиэтилен (до 10 Мрад), что увеличивает количество поперечных связей. Чтобы снизить окислительный потенциал, компоненты облучают в бескислородной среде с барьерной упаковкой. Существует ограниченное количество доказательств сравнительной эффективности разных пар трения тазобедренных суставов. Рандомизированные клинические исследования демонстрируют похожие коротко- и среднесрочные периоды выживания среди керамо-керамической пары трения, керамики с кросс-линкованным полиэтиленом и металла с кросс-линкованным полиэтиленом у больных моложе 65 лет. Керамические головки приобретают все большую популярность по сравнению с металлическими головками. Огромные различия до сих пор существуют среди стран по частоте использования цементной и бесцементной фиксации. В 2013 году в некоторых странах использование цементных ножек было меньше 4 %, в других странах оно составляло более 68 % в том же году. Во всем мире сегодня существует тенденция к увеличению количества бесцементной фиксации. Общенациональная база данных пациентов США демонстрирует причины проведения ревизионного ТЭТС: среди 51 345 повторных ТЭТС вывихи составляли 22,5 %, асептическая нестабильность — 19,7 %, инфекция — 14,8 %. В 2030 году клиническая потребность в первичном ТЭТС увеличится на 174 %, до 572 000 случаев в год, по сравнению с 2002 годом, а спрос на ревизионное ТЭТС увеличится на 137 % до 2030 года.

Lateral ridge augmentation in the posterior part of the mandible with an autogenous bone block graft harvested from the ascending mandibular ramus. A 10-year retrospective study

PurposeThe objective of the present retrospective study was to assess the long-term implant treatment outcome and patient satisfaction after lateral ridge augmentation in the posterior mandible with autogenous bone block graft harvested from the ascending mandibular ramus. Materials and methodsSeventy-four lateral ridge augmentation procedures in the posterior mandible with an autogenous bone block graft harvested from the ascending mandibular ramus and delayed placement of 87 implants was conducted in 46 consecutive patients from 2002–2006. Records and radiographs were retrospectively analyzed. Twenty-four patients responded to a 10-years follow-up examination including 39 lateral ridge augmentation procedures and 48 implants. Survival of suprastructures and implants, peri-implant marginal bone loss, patient perception and professional evaluation of the final implant treatment was assessed after 10 years. ResultsThe 10-year survival of suprastructures and implants was 100% as all the implants and suprastructures were present with limited peri-implant marginal bone loss. The patients were highly satisfied with the esthetic and implant treatment outcome. ConclusionLateral ridge augmentation in the posterior mandible with autogenous bone block graft from the ascending mandibular ramus is characterized by high long-term implant survival rate and patient satisfaction.

Long-term clinical performance of flapless implant surgery compared to the conventional approach with flap elevation: A systematic review and meta-analysis.

BACKGROUNDThe conventional implant approach involves flap elevation, which may result in increased soft tissue and bone loss and postoperative morbidity. The flapless surgical technique, aided by three-dimensional medical imaging equipment, is regarded as a possible alternative to the conventional approach to alleviate the above issues. Several studies have been performed regarding the role of flapless implant surgery. However, the results are inconsistent and there is no robust synthesis of long-term evidence to better inform surgeons regarding which type of surgical technique is more beneficial to the long-term prognosis of patients in need of implant insertion.AIMTo compare the long-term clinical performance after flapless implant surgery to that after the conventional approach with flap elevation.METHODSPubMed, EMBASE, Cochrane Central Register of Controlled Trials, and grey literature databases were searched from inception to 23 September 2019. Randomised controlled trials (RCTs) and cohort studies comparing the long-term clinical performance after flapless implant surgery to that after the conventional approach over a follow-up of three years or more were included. Meta-analyses were conducted to estimate the odds ratios (ORs) or mean differences (MDs) and their 95% confidence intervals (CIs) between the long-term implant survival rate, marginal bone loss, and complication rate of the flapless and conventional groups. Subgroup analyses were carried out to account for the possible effects of the guided or free-hand method during flapless surgery.RESULTSTen articles, including four RCTs and six cohort studies, satisfied the eligibility criteria and nine of them were included in the meta-analysis. There was no significant difference between the long-term implant survival rate [OR = 1.30, 95%CI (0.37, 4.54), P = 0.68], marginal bone loss [MD = 0.01, 95%CI (-0.42, 0.44), P = 0.97], and complication rate [OR = 1.44, 95%CI (0.77, 2.68), P = 0.25] after flapless implant surgery and the conventional approach. Moreover, subgroup analyses revealed that there was no statistically significant difference between the implant survival rate [guided: OR = 1.52, 95%CI (0.19, 12.35), P = 0.70]; free-hand: n = 1, could not be estimated), marginal bone loss [guided: MD = 0.22, 95%CI (-0.14, 0.59), P = 0.23; free-hand: MD = -0.27, 95%CI (-1.10, 0.57), P = 0.53], or complication rate [guided: OR = 1.16, 95%CI (0.52, 2.63), P = 0.71; free-hand: OR = 1.75, 95%CI (0.66, 4.63), P = 0.26] in the flapless and conventional groups either with use of the surgical guide or by the free-hand method.CONCLUSIONThe flapless surgery and conventional approach had comparable clinical performance over three years or more. The guided or free-hand technique does not significantly affect the long-term outcomes of flapless surgery.

Long-Term Survival and Peri-Implant Health of Titanium Implants with Zirconia Abutments: A Systematic Review and Meta-Analysis.

To evaluate the long-term implant survival rate of titanium implants with zirconia abutments, and the effects of implants with zirconia abutments on marginal bone loss (MBL) and pocket probing depth (PPD) compared with all-titanium implants. The searched electronic database included the Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, and the Chinese Biomedical Literature Database. Two types of studies were included: clinical studies reporting the survival rate of titanium implants with zirconia abutments with at least a mean/median 5-year follow-up, and clinical trials reporting the effects of implants with zirconia abutments on MBL and PPD compared with all-titanium implants. Two reviewers screened and selected the records, assessed quality, and extracted data of included studies independently. This review included 16 studies from 18 publications. None of the comparative studies was assessed at a low risk of bias. The overall implant survival rate of implants with zirconia abutments was estimated to be 96% (confidence intervals [CIs] [94%, 98%], I2 = 0%). For the comparison between implants with zirconia abutments and all-titanium implants, the results significantly favored implants with zirconia abutments (for MBL, mean difference [MD] = -0.09, CIs [-0.17, 0.00], p = 0.05, I2 = 40%; for PPD, MD = -0.18, CIs [-0.32, -0.05], p = 0.008, I2 = 0%). Zirconia abutments were favored more when the prosthesis was an implant-supported overdenture rather than a single crown. Implants with zirconia abutments may have an acceptable performance on peri-implant health compared with all-titanium implants; however, the implant survival rate of implants with zirconia abutments is slightly lower than all-titanium implants in the long-term follow-up. Additional studies are needed to explain this dichotomy.

Maxillary Sinus Floor Augmentation With Autogenous Bone Graft From the Ascending Mandibular Ramus.

The objective of the present study was to assess patient satisfaction and esthetic implant outcome 10 years after maxillary sinus floor augmentation with autogenous bone graft from the mandibular ramus. Maxillary sinus floor augmentation with autogenous bone graft from the mandibular ramus was conducted in 48 consecutive patients from 2002 to 2006. Records and radiographs were retrospectively analyzed. Twenty-four patients including 34 sinus augmentation procedures and 37 implants were evaluated after 10 years. Subjective and professional evaluations of the final periimplant soft tissue, implant crown, and total implant treatment were conducted. The 10-year survival of suprastructures and implants was 84% and 100%, respectively. The patients were highly satisfied with the esthetic and implant treatment outcome expressed by scores >90 on the visual analog scale. Most implants were characterized by scores of 1 or 2, resulting in a mean pink esthetic score of 9 (maximum 14) and a white esthetic score of 8 (maximum 10). Maxillary sinus floor augmentation with autogenous bone graft is characterized by high long-term implant survival rate and patient satisfaction.

Effect of supportive periodontal therapy on long-term implant survival rate

Effect of supportive periodontal therapy on long-term implant survival rate

The Effect of Moderately Controlled Type 2 Diabetes on Dental Implant Survival and Peri-implant Bone Loss: A Long-Term Retrospective Study.

The objective of this study was to assess whether long-term implant survival rates and bone loss in patients with moderately controlled type 2 diabetes is similar to the rates reported in the nondiabetic population. This retrospective observational study utilized patient medical records from a general practitioner's dental office. The records of patients who had moderately controlled type 2 diabetes with hemoglobin A1C (HbA1c) up to 8% and glucose level below 150 mg/dL were reviewed, as patients with HbA1c up to 7% are considered to be well-controlled type 2 diabetes. Follow-up data were recorded and analyzed. Inclusion criteria were as follows: partially edentulous patients with missing teeth who were subsequently treated with implant-supported prosthetic restorations; patients were at least 18 years of age and demonstrated the ability to maintain oral hygiene. Exclusion criteria were as follows: patients did not present for annual follow-up visits; patients presented with a neglected periodontal status; patient records had incomplete surgical or restorative data or nondiagnostic radiographs; implants with external hexagonal and machined surfaces. All the restorations were cement-retained. Three different implant insertion/placement methods were used: (1) implants immediately inserted following tooth extraction; (2) implants inserted 6 to 8 weeks after tooth extraction to allow for primary healing; and (3) implants inserted 4 to 6 months after tooth extraction. After review of more than 3,256 medical records, 169 patients were identified (with 1,112 implants) who met the inclusion criteria. The mean follow-up time was 8.7 years, with a minimum of 4.9 years. Sixty-seven implants failed, yielding a 94% overall implant survival rate. The overall mean bone loss around the implants was 1.98 (± 1.81) mm. Comparable to data published earlier, no statistical significance in survival rate was found between the nondiabetic and diabetic population. The delayed insertion protocol presented the least bone loss, compared with immediate insertion (P = .06), and compared with early insertion (P = .046). The results show that implant survival and bone loss levels were comparable to reported outcomes in the nondiabetic population. The delayed insertion protocol presented less bone loss compared with other insertion methods. Likewise, less bone loss was found in implants placed in the posterior region.

Long-term Survival of Straumann Dental Implants with TPS Surfaces: A Retrospective Study with a Follow-up of 12 to 23 Years.

The aim of this study was to evaluate the long-term dental implant survival rates of Straumann dental implants in a university hospital environment over 12 to 23 years. A total of 388 Straumann dental implants with titanium-sprayed surfaces (TPS) were inserted in 92 patients between 1988 and 1999 in the Department of Oral and Maxillofacial Surgery of the University Hospital Schleswig-Holstein in Kiel, and they were reevaluated with standardized clinical and radiological exams. Kaplan-Meier analyses were performed for individual factors. Cox proportional hazard regression analysis was used to detect the factors influencing long-term implant failure. The long-term implant survival rate was 88.03% after an observation time of 12.2 to 23.5 years. Cox regression revealed statistically significant influences of the International Team for Implantology (ITI) implantation type (p = .00354) and tobacco smoking (p = .01264) on implant failure. A proportion 82.8% of the patients with implant losses had a medical history of periodontitis. Peri-implantitis was diagnosed in 9.7% of the remaining implants in the long-term survey. This study emphasized the long-term rehabilitation capabilities of Straumann dental implants in complex cases. The survival rates after several years constitute important information for patients, as well as for clinicians, in deciding about different concepts of tooth replacement. Patient-related and technical factors - determined before implant placement - could help to predict the risk of implant loss.

Limitations of spinal cord stimulation for pain management.

Limitations of spinal cord stimulation for pain management.

S412: Sinus Floor Augmentation With Simultaneous Implant Placement in the Severely Atrophic Posterior Maxilla

Background: One-stage maxillary sinus grafting and implant placement has been traditionally limited to patients with at least 4-5 mm of residual bone to ensure that the implant is completely stabilized. This is considered to be one of the most crucial factors for primary implant stability and parallelism and, subsequently, osseointegration. Improved initial implant stability provided by new surgical techniques and roughened implant surfaces has led some clinicians to advocate extending this treatment option to patients with <3 mm of residual bone height, despite the lack of long-term data on the survival of such implants. The aim of this presentation is to review the surgical technique and to determine the long-term survival rates of implants with roughened surfaces immediately placed into maxillary sinus grafts in patients with 1-5 mm of residual bone. Discussion: Initial implant stability and parallelism was achieved by meticulous condensation of the particulate bone graft material around the implants, and was augmented by the frictional interface between the roughened implant surfaces and the host tissues and selection of an appropriate graft material. Conclusions: Simultaneous implant placement into sinus floor grafts can be performed in patients with at least 1-2 mm of vertical residual bone height when careful case planning and surgical techniques are used.

S325: Sinus Floor Augmentation With Simultaneous Implant Placement in the Severely Atrophic Posterior Maxilla

One-stage maxillary sinus grafting and implant placement has been traditionally limited to patients with at least 4-5 mm of residual bone to ensure that the implant is completely stabilized. This is considered to be one of the most crucial factors for primary implant stability, parallelism, and subsequently osseointegration. Improved initial implant stability provided by new surgical techniques and roughened implant surfaces has led some clinicians to advocate extending this treatment option to patients with <3 mm of residual bone height, despite the lack of long-term data on the survival of such implants. The aim of this presentation is to review the surgical technique and to determine the long-term survival rates of implants with roughened surfaces immediately placed into maxillary sinus grafts in patients with 1-5 mm of residual bone.Initial implant stability and parallelism was achieved by meticulous condensation of the particulate bone graft material around the implants, and was augmented by the frictional interface between the roughened implant surfaces and the host tissues and selection of an appropriate graft material.Simultaneous implant placement into sinus floor grafts can be performed in patients with at least 1-2 mm of vertical residual bone height when careful case planning and surgical techniques are used. One-stage maxillary sinus grafting and implant placement has been traditionally limited to patients with at least 4-5 mm of residual bone to ensure that the implant is completely stabilized. This is considered to be one of the most crucial factors for primary implant stability, parallelism, and subsequently osseointegration. Improved initial implant stability provided by new surgical techniques and roughened implant surfaces has led some clinicians to advocate extending this treatment option to patients with <3 mm of residual bone height, despite the lack of long-term data on the survival of such implants. The aim of this presentation is to review the surgical technique and to determine the long-term survival rates of implants with roughened surfaces immediately placed into maxillary sinus grafts in patients with 1-5 mm of residual bone. Initial implant stability and parallelism was achieved by meticulous condensation of the particulate bone graft material around the implants, and was augmented by the frictional interface between the roughened implant surfaces and the host tissues and selection of an appropriate graft material. Simultaneous implant placement into sinus floor grafts can be performed in patients with at least 1-2 mm of vertical residual bone height when careful case planning and surgical techniques are used.

Short Implants Placed One‐Stage in Maxillae and Mandibles: A Retrospective Clinical Study with 1 to 9 Years of Follow‐Up

The use of short implants (7-8.5 mm) has historically been associated with lower survival rates than for longer implants. However, recent clinical studies indicate that short implants may support most prosthetic restorations quite adequately, but still clinical documentation is sparse. The purpose of this study was to report on the placement of short Brånemark implants, testing the hypothesis that short implants in atrophied jaws might give similar long-term implant survival rates as longer implants used in larger bone volumes. This retrospective clinical study included 237 consecutively treated patients with 408 short Brånemark implants supporting 151 fixed prostheses. One hundred thirty-one of the implants were 7-mm long, and 277 were 8.5-mm long. Final abutments were delivered at the time of surgery, and final prostheses were delivered 4 to 6 months later. One hundred and twenty six of the 7-mm implants (96%) have passed the 1-year follow-up; 110 (84%), the 2-year follow-up; and 88 (67%), the 5-year follow-up. Five implants failed in four patients before the 6-month follow-up, giving a cumulative survival rate of 96.2% at 5 years. The average bone resorption was 1 mm (SD=0.6 mm) after the first year and 1.8 mm (SD=0.8 mm) after the fifth year of function. Two hundred sixty nine of the 8.5-mm implants (97%) have passed the 1-year follow-up; 220 (79%), the 2-year follow-up; and 142 (51%), the 5-year follow-up. Eight implants failed in seven patients before the 6-month follow-up, giving a cumulative survival rate of 97.1% at 5 years. The average bone resorption was 1.3 mm (SD=0.8 mm) after the first year and 2.2 mm (SD=0.9 mm) after the fifth year of function. The cumulative survival rates of 96.2 and 97.1% at 5 years for implants of 7.0- and 8.5-mm length, respectively, indicate that one-stage short Brånemark implants used in both jaws is a viable concept.

Predictability of simultaneous implant placement in the severely atrophic posterior maxilla: A 9-year longitudinal experience study of 2,132 implants placed into 731 human sinus grafts

Purpose One-stage implant placement in the grafted maxillary sinus has traditionally been limited to patients with at least 5 mm of residual bone to ensure complete implant stabilization. The aim of this prospective study was to determine the long-term survival rates of implants with roughened surfaces placed immediately into maxillary sinus grafts in patients with 1 to 5 mm of residual bone. Materials and Methods A total of 2,132 microtextured screw-type (n=1,374) or hydroxyapatite-coated cylinder-type (n=758) implants were immediately placed into the grafted sinuses of 731 patients. The implants were restored and monitored for up to 9 years of clinical follow-up. Results Cumulative survival at 9 years was 97.9% (n=2,091 implants); 20.4% of the implants were placed in 1 to 2 mm of residual bone. Discussion Initial implant stability and parallelism were achieved through a combination of meticulous condensation of the particulate bone graft material around the implants, the frictional interface of the roughened implant surfaces and the host tissues, and selection of an appropriate graft material. Conclusions Simultaneous implant placement into sinus floor grafts can be a predictable treatment option for patients with at least 1 to 2 mm of vertical residual bone height when careful case planning and meticulous surgical techniques are used.—Reprinted with permission of Quintessence Publishing. One-stage implant placement in the grafted maxillary sinus has traditionally been limited to patients with at least 5 mm of residual bone to ensure complete implant stabilization. The aim of this prospective study was to determine the long-term survival rates of implants with roughened surfaces placed immediately into maxillary sinus grafts in patients with 1 to 5 mm of residual bone. A total of 2,132 microtextured screw-type (n=1,374) or hydroxyapatite-coated cylinder-type (n=758) implants were immediately placed into the grafted sinuses of 731 patients. The implants were restored and monitored for up to 9 years of clinical follow-up. Cumulative survival at 9 years was 97.9% (n=2,091 implants); 20.4% of the implants were placed in 1 to 2 mm of residual bone. Initial implant stability and parallelism were achieved through a combination of meticulous condensation of the particulate bone graft material around the implants, the frictional interface of the roughened implant surfaces and the host tissues, and selection of an appropriate graft material. Simultaneous implant placement into sinus floor grafts can be a predictable treatment option for patients with at least 1 to 2 mm of vertical residual bone height when careful case planning and meticulous surgical techniques are used.—Reprinted with permission of Quintessence Publishing.

The Burch-Schneider antiprotrusio cage in acetabular revision surgery: A mean follow-up of 12 years

A total of 38 acetabular revisions using a Burch-Schneider antiprotrusio cage in 37 patients (18 women and 19 men), with a mean age at surgery of 75 years (range, 55–88 years), were evaluated retrospectively with a mean follow-up of 12 years (range, 8–21 years). In 2 cases with total hip dislocation and in 1 case with a deep infection, revision of the antiprotrusio cages was required. Defining every revision of the antiprotrusio cage as the endpoint of survivorship, the antiprotrusio cage showed a survival rate of 92% after 21 years. Clinical evaluation of the surviving patients showed a mean Harris hip score of 76 points (range, 20–96). Radiologic evaluation revealed that 1 antiprotrusio cage was loose and that 4 femoral stems were loose. The Burch-Schneider antiprotrusio cage compares favorably with other devices with regard to long-term implant survival rate.

Long-term results following mandibular alveolar ridge augmentation using calvarial bone in combination with enosseous implants

The objective of the present retrospective study was to assess the long-term implant treatment outcome and patient satisfaction after lateral ridge augmentation in the posterior mandible with autogenous bone block graft harvested from the ascending mandibular ramus.Seventy-four lateral ridge augmentation procedures in the posterior mandible with an autogenous bone block graft harvested from the ascending mandibular ramus and delayed placement of 87 implants was conducted in 46 consecutive patients from 2002–2006. Records and radiographs were retrospectively analyzed. Twenty-four patients responded to a 10-years follow-up examination including 39 lateral ridge augmentation procedures and 48 implants. Survival of suprastructures and implants, peri-implant marginal bone loss, patient perception and professional evaluation of the final implant treatment was assessed after 10 years.The 10-year survival of suprastructures and implants was 100% as all the implants and suprastructures were present with limited peri-implant marginal bone loss. The patients were highly satisfied with the esthetic and implant treatment outcome.Lateral ridge augmentation in the posterior mandible with autogenous bone block graft from the ascending mandibular ramus is characterized by high long-term implant survival rate and patient satisfaction.