Yi Jung-Myung, Lee Jae-Kwan, Um Heung-Sik, Chang Beom-Seok, Lee Min-Ku
Department of Periodontology and Research Institute of Oral Sciences, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.
J Periodontal Implant Sci. 2010 Oct;40(5):244-8. doi: 10.5051/jpis.2010.40.5.244. Epub 2010 Oct 31.
The purpose of this study was to radiographically evaluate marginal bony changes in relation to different vertical positions of dental implants.
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).
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.
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.
本研究旨在通过影像学评估牙种植体不同垂直位置相关的边缘骨变化。
对107例患者植入的200枚种植体进行检查。根据种植体基台连接（微间隙）的垂直位置将种植体分类为：“骨水平”、“骨水平以上”或“骨水平以下”。在种植体植入后即刻、二期手术后即刻、义齿植入后6个月以及义齿植入后1年拍摄的X线片上检查边缘骨水平。通过测量微间隙与最冠方骨-种植体接触（BIC）之间的距离进行影像学评估。
种植体植入后即刻，微间隙与最冠方BIC之间的距离为0.06±0.68mm；二期手术时为0.43±0.83mm；负载后6个月为1.36±0.56mm；负载后1年为1.53±0.51mm（平均值±标准差）。所有骨变化均具有统计学意义，但二期手术与负载后6个月之间的差异大于其他时期。在“骨水平以下”组中，种植体植入至负载后1年的边缘骨变化约为2.25mm，“骨水平”组为1.47mm，“骨水平以上”组为0.89mm。因此，“骨水平以上”组的边缘骨变化小于其他组，“骨水平以下”组大于其他组。
我们的结果表明，种植体植入后愈合早期会发生边缘骨变化。这些变化取决于种植体的垂直位置。
