Marginal bony changes in relation to different vertical positions of dental implants.
10.5051/jpis.2010.40.5.244
- Author:
Jung Myung YI
1
;
Jae Kwan LEE
;
Heung Sik UM
;
Beom Seok CHANG
;
Min Ku LEE
Author Information
1. Department of Periodontology and Research Institute of Oral Sciences, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea. dentist@gwnu.ac.kr
- Publication Type:Original Article
- Keywords:
Alveolar bone loss;
Dental implants
- MeSH:
Alveolar Bone Loss;
Dental Implants;
Humans;
Nitrogen Mustard Compounds;
Prostheses and Implants
- From:Journal of Periodontal & Implant Science
2010;40(5):244-248
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The purpose of this study was to radiographically evaluate marginal bony changes in relation to different vertical positions of dental implants. METHODS: Two hundred implants placed in 107 patients were examined. The implants were classified by the vertical positions of the fixture-abutment connection (microgap): 'bone level,' 'above bone level,' or 'below bone level.' Marginal bone levels were examined in the radiographs taken immediately after fixture insertion, immediately after second-stage surgery, 6 months after prosthesis insertion, and 1 year after prosthesis insertion. Radiographic evaluation was carried out by measuring the distance between the microgap and the most coronal bone-to-implant contact (BIC). RESULTS: Immediately after fixture insertion, the distance between the microgap and most coronal BIC was 0.06 +/- 0.68 mm; at second surgery, 0.43 +/- 0.83 mm; 6 months after loading, 1.36 +/- 0.56 mm; and 1 year after loading, 1.53 +/- 0.51 mm (mean +/- SD). All bony changes were statistically significant but the difference between the second surgery and the 6-month loading was greater than between other periods. In the 'below bone level' group, the marginal bony change between fixture insertion and 1 year after loading was about 2.25 mm, and in the 'bone level' group, 1.47 mm, and in 'above bone level' group, 0.89 mm. Therefore, the marginal bony change was smaller than other groups in the 'above bone level' group and larger than other groups in the 'below bone level' group. CONCLUSIONS: Our results demonstrated that marginal bony changes occur during the early phase of healing after implant placement. These changes are dependent on the vertical positions of implants.
