KMID : 0363020100400050244
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Journal of Korean Academy of Periodontology 2010 Volume.40 No. 5 p.244 ~ p.248
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Marginal bony changes in relation to different vertical positions of dental implants
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Yi Jung-Myung
Lee Jae-Kwan Um Heung-Sik Chang Beom-Seok Lee Min-Ku
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Abstract
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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 ¡¾ 0.68 mm; at second surgery, 0.43 ¡¾ 0.83 mm; 6 months after loading, 1.36 ¡¾ 0.56 mm; and 1 year after loading, 1.53 ¡¾ 0.51 mm (mean ¡¾ 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.
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KEYWORD
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Alveolar bone loss, Dental implants
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