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Abutment Junction (abutment + junction)
Selected AbstractsA Clinical, Radiographic, and Microbiologic Comparison of Astra Tech and Brånemark Single Tooth ImplantsCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 2 2000Lorena Puchades-Roman BDS, M Clin Dent ABSTRACT Background: The soft tissues around single tooth implants differ fundamentally from the gingiva around natural teeth. There are very limited data comparing soft tissues around different implant systems. Aim: To assess whether the design characteristics of dental implants, particularly the implant-abutment junction, may affect the dimensions and health of the peri-implant soft tissues and radiographic bone levels. Subjects and Method: Fifteen Astra Tech and 15 Brånemark single tooth implants that had been in function for a minimum of 2 years in 30 partially dentate subjects were examined for plaque accumulation, probing depth, and bleeding on probing and compared to contralateral healthy teeth. Standardized radiographs were taken to measure the most coronal bone to implant contact on the mesial and distal surfaces. In addition, samples of subgingival plaque were taken on paper points and examined by darkfield microscopy. Results: Significantly higher mean probing depths (p < .001) and higher mean percentage of spirochetes (p= .003) were found at implants compared to teeth. In this sample, the Brånemark implants had significantly higher probing depths than the Astra Tech implants (median and interquartile range: Astra Tech 2.7 mm [2,3], Brånemark 3.3 mm [3,3.7] p= .026) and the most coronal bone to implant contact was closer to the implant,abutment junction in the Astra Tech implants (Astra Tech 0.6 mm [0.2,0.9], Brånemark 1.6 mm [1.4,2.0]. p < .001). Conclusion: Although there were statistically significant differences between the two implant systems, the clinical differences were small and probably reflect differences in the biologic width in relation to the location and design of the implant-abutment junction. [source] A randomized-controlled clinical trial evaluating clinical and radiological outcomes after 3 and 5 years of dental implants placed in bone regenerated by means of GBR techniques with or without the addition of BMP-2CLINICAL ORAL IMPLANTS RESEARCH, Issue 7 2009Ronald E. Jung Abstract Objective: The aim of this randomized-controlled clinical trial was to evaluate the long-term outcome of implants placed in bone augmented with a xenogenic bone substitute material and a collagen membrane with or without the addition of recombinant human bone morphogenetic protein-2 (rhBMP-2). Material and methods: Eleven patients received a total of 34 implants placed into sites exhibiting lateral bone defects. In a split mouth design, the defects were randomly treated with the graft material and the collagen membrane either with (test) or without (control) rhBMP-2. The patients were examined 3 and 5 years after insertion of the prosthetic restoration. Student's paired t -test was performed to detect differences between the two groups. Results: The survival rate at 3 and 5 years was 100% for both groups. The peri-implant soft tissues were stable and healthy without any difference between the two groups. The prosthetic reevaluation demonstrated four loose prosthetic screws during the first 3 years and seven ceramic chippings after 3 and 5 years. The mean distance between the first bone to implant contact to implant abutment junction at 3 years was 1.37 mm (test), 1.22 mm (control), and 1.38 mm (test), and 1.23 mm (control) at 5 years. The difference of <0.2 mm between test and control implants was not statistically significant. The mean change of the marginal bone level between baseline and 5 years ranged from ,0.07 mm (mesial, test), ,0.11 mm (distal, test), ,0.03 mm (mesial, control), to +0.13 mm (distal, control). No statistically significant differences were observed between test and control sites. Conclusion: Implants placed in bone augmented with and without rhBMP-2 revealed excellent clinical and radiological outcomes after 3 and 5 years. [source] Long-term effects of magnetron-sputtered calcium phosphate coating on osseointegration of dental implants in non-human primatesCLINICAL ORAL IMPLANTS RESEARCH, Issue 2 2009Fügl Alexander Abstract Objectives: To determine the effect of magnetron-sputtered calcium phosphate coating of implants on the later stages of osseointegration in a non-human primate model. Material and methods: Eighteen and 20 implants with a 0.1 ,m amorphous calcium phosphate coating and a turned surface, respectively, were inserted in the anterior upper and lower jaw of adult non-human primates. Following a 7.5 months healing period, one part of the implants remained in the submerged position. The other part of implants was connected to healing abutments to allow peri-implant inflammation to occur. After another 20 months, histologic and histomorphometric analysis of the peri-implant area was performed. Results: Submerged implants with a calcium phosphate coating and a turned surface showed no signs of an inflammatory reaction. The histomorphometric parameters ,bone volume per tissue volume' (BV/TV) and ,bone-to-implant contacts' (BIC) were not affected by calcium phosphate coating. Non-submerged implants of both groups showed occasionally signs of inflammation at the implant,abutment junction. Histomorphometric analysis revealed that the distance between the implant,abutment junction and the most coronal level (where bone was attached to the implant) as well as BV/TV and BIC were independent from the surface modification. Conclusion: Our results show that dental implants with calcium phosphate coating behave similar to turned implants independently whether they are connected to healing abutments or remain submerged. Ultra-thin calcium phosphate coating can combine the positive effects of calcium phosphate during the early stage of osseointegration without causing impairment of the later stages. [source] Marginal Bone Loss at Implants: A Retrospective, Long-Term Follow-Up of Turned Brånemark System® ImplantsCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 1 2009Odont Lic, Solweig Sundén Pikner DDS ABSTRACT Background: Lately, presence of progressive bone loss around oral implants has been discussed. Purpose: The aim of this study was to report in a large patient group with different prosthetic restorations marginal bone level and its change as measured in radiographs obtained from prosthesis insertion up to a maximum 20 years in service. Further, it also aimed to study the impact of gender, age, jaw, prosthetic restoration, and calendar year of surgery. Materials and Methods: Out of 1,716 patients recorded for clinical examination during 1999, 1,346 patients (78.4%) could be identified. A total of 640 patients (3,462 originally installed Brånemark System® implants, Nobel Biocare, Göteborg, Sweden) with a follow-up of ,5 years were included in the study, while patients with continuous overdentures and augmentation procedures were not. Distance between the fixture/abutment junction (FAJ) and the marginal bone level was recorded. Results: The number of implants with a mean bone level of ,3 mm below FAJ increased from 2.8% at prosthesis insertion to 5.6% at year 1, and 10.8% after 5 years. Corresponding values after 10, 15, and 20 years were 15.2, 17.2, and 23.5%, respectively. Implant-based bone loss was as a mean 0.8 mm (SD 0.8) after 5 years, followed by only minor average changes. Mean bone loss on patient level followed a similar pattern. Disregarding follow-up time, altogether 183 implants (107 patients) showed a bone loss ,3 mm from prosthesis insertion to last examination. Significantly larger bone loss was found the older the patient was at surgery and for lower jaw implants. Conclusions: Marginal bone support at Brånemark implants was with few exceptions stable over years. [source] Clinical characteristics at implants with a history of progressive bone lossCLINICAL ORAL IMPLANTS RESEARCH, Issue 2 2008Christer Fransson Abstract Objective: The aim of the present study was to describe the clinical characteristics at implants with a history of progressive bone loss. Material and methods: Eighty-two out of 184 previously identified subjects with a history of progressive bone loss volunteered for the study. Clinical assessments of plaque, bleeding on probing (BoP), probing pocket depth (PPD), suppuration following probing (Pus), presence of calculus on implants surfaces (Calc) and ,recession' i.e. the mucosal margin in level with or apical of the fixture/abutment junction were performed at the mesial, distal, buccal and lingual aspects of each implant and without removing the bridge constructions. Results: It was demonstrated that the frequencies of BoP, Pus, ,recession' and PPD,6 mm were higher at implants with than without ,progressive' bone loss. In addition, smokers had larger numbers of affected implants than non-smokers, and the proportion of affected implants that exhibited Pus and PPD,6 mm was higher in smokers than in non-smokers. The logistic regression analysis revealed that the findings of Pus, ,recession' and PPD,6 mm at an implant in a smoking subject had a 69% accuracy in identifying the history of progressive bone loss. Conclusion: The results from this study demonstrate an association between clinical signs of pathology and bone loss at implants. It is recommended to include clinical assessments in the evaluation of implant therapy. [source] | ||||||||||