Effect of initial placement level and wall thickness on maintenance of the marginal bone level in implants with a conical implant-abutment interface: a 5-year retrospective study
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Purpose: Implant wall thickness and the height of the implant-abutment interface are known as factors that affect the distribution of stress on the marginal bone around the implant. The goal of this study was to evaluate the long-term effects of supracrestal implant placement and implant wall thickness on maintenance of the marginal bone level. Methods: In this retrospective study, 101 patients with a single implant were divided into the following 4 groups according to the thickness of the implant wall and the initial implant placement level immediately after surgery: 0.75 mm wall thickness, epicrestal position; 0.95 mm wall thickness, epicrestal position; 0.75 mm wall thickness, supracrestal position; 0.95 mm wall thickness, supracrestal position. The marginal bone level change was assessed 1 day after implant placement, immediately after functional loading, and 1 to 5 years after prosthesis delivery. To compare the marginal bone level change, repeated-measures analysis of variance was used to evaluate the statistical significance of differences within groups and between groups over time. Pearson correlation coefficients were also calculated to analyze the correlation between implant placement level and bone loss. Results: Statistically significant differences in bone loss among the 4 groups (P<0.01) and within each group over time (P<0.01) were observed. There was no significant difference between the groups with a wall thickness of 0.75 mm and 0.95 mm. In a multiple comparison, the groups with a supracrestal placement level showed greater bone loss than the epicrestal placement groups. In addition, a significant correlation between implant placement level and marginal bone loss was observed. Conclusions: The degree of bone resorption was significantly higher for implants with a supracrestal placement compared to those with an epicrestal placement.
Abstract
Purpose: Implant wall thickness and the height of the implant-abutment interface are known as factors that affect the distribution of stress on the marginal bone around the implant. The goal of this study was to evaluate the long-term effects of supracrestal implant placement and implant wall thickness on maintenance of the marginal bone level. Methods: In this retrospective study, 101 patients with a single implant were divided into the following 4 groups according to the thickness of the implant wall and the initial implant placement level immediately after surgery: 0.75 mm wall thickness, epicrestal position; 0.95 mm wall thickness, epicrestal position; 0.75 mm wall thickness, supracrestal position; 0.95 mm wall thickness, supracrestal position. The marginal bone level change was assessed 1 day after implant placement, immediately after functional loading, and 1 to 5 years after prosthesis delivery. To compare the marginal bone level change, repeated-measures analysis of variance was used to evaluate the statistical significance of differences within groups and between groups over time. Pearson correlation coefficients were also calculated to analyze the correlation between implant placement level and bone loss. Results: Statistically significant differences in bone loss among the 4 groups (P<0.01) and within each group over time (P<0.01) were observed. There was no significant difference between the groups with a wall thickness of 0.75 mm and 0.95 mm. In a multiple comparison, the groups with a supracrestal placement level showed greater bone loss than the epicrestal placement groups. In addition, a significant correlation between implant placement level and marginal bone loss was observed. Conclusions: The degree of bone resorption was significantly higher for implants with a supracrestal placement compared to those with an epicrestal placement.
참고문헌 (12)
- Oh TJ, "The causes of early implant bone loss: myth or science?", J Periodontol, 73, pp.322~333 (2002)
- Hansson S, "A conical implant-abutment interface at the level of the marginal bone improves the distribution of stresses in the supporting bone. An axisymmetric finite element analysis", Clin Oral Implants Res, 14, pp.286~293 (2003)
- Hansson S, "The implant neck: smooth or provided with retention elements. A biomechanical approach", Clin Oral Implants Res, 10, pp.394~405 (1999)
- Mailth G, "Bone resorption at the entry of osseointegrated implants--a biomechanical phenomenon. Finite element study", Z Stomatol, 86, pp.207~216 (1989)
- Qian L, "Effects of implant diameter, insertion depth, and loading angle on stress", strain fields in implant, Int J Oral Maxillofac Implants, pp.2009, 24[DOI]
- Froum SJ, "Epicrestal and subcrestal placement of platformswitched implants: 18 month-result of a randomized, controlled, split-mouth, prospective clinical trial", Clin Oral Implants Res, 29, pp.353~366 (2018)
- Geramy A, "Finite element analysis of three designs of an implant-supported molar crown", J Prosthet Dent, 92, pp.434~440 (2004)
- Petrie CS, "Comparative evaluation of implant designs: influence of diameter, length, and taper on strains in the alveolar crest. A three-dimensional finite-element analysis", Clin Oral Implants Res, 16, pp.486~494 (2005)
- Geng JP, "Application of finite element analysis in implant dentistry: a review of the literature", J Prosthet Dent, 85, pp.585~598 (2001)
- Moriwaki H, "Influence of implant length and diameter, bicortical anchorage, and sinus augmentation on bone stress distribution: three-dimensional finite element analysis", Int J Oral Maxillofac Implants, 31, pp.e84~e91 (2016)
- Schwarz F, "Impact of implant-abutment connection, positioning of the machined collar", microgap, and platform switching on crestal bone level changes. Camlog Foundation Consensus Report, 2014, pp.25, 1301~1303
- Moergel M, "Radiographic evaluation of conical tapered platform-switched implants in the posterior mandible: 1-year results of a two-center prospective study", Clin Oral Implants Res, 27, pp.686~693 (2016)