Institute of Biomedical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Clin Oral Investig. 2012 Dec;16(6):1679-84. doi: 10.1007/s00784-011-0658-0. Epub 2012 Jan 10.
The purpose of this study was to determine the correlation between the peak insertion torque value (ITV) of a dental implant and the bone-implant contact percentage (BIC%).
Dental implants were inserted into specimens comprising a 2-mm-thick artificial cortical shell representing cortical bone and artificial foam bone representing cancellous bone with four densities (groups 1 to 4--0.32, 0.20, 0.16, and 0.12 g/cm(3)). Each specimen with an inserted implant was subjected to micro-computed tomography (micro-CT) scanning, from which the 3D BIC% values were calculated. Pearson's correlation coefficients (r) between the ITV and BIC% were calculated.
The ITVs in groups 1 to 4 were 56.2 ± 4.6 (mean±standard deviation), 45.6 ± 0.9, 43.3 ± 4.3, and 38.5 ± 3.4 N cm, respectively, and the corresponding BIC% values were 41.5 ± 0.5%, 39.0 ± 1.0%, 30.8 ± 1.1%, and 26.2 ± 1.6%. Pearson's correlation coefficient between the ITV and BIC% was r = 0.797 (P < 0.0001).
The initial implant stability, quantified as the ITV, was strongly positively correlated with the 3D BIC% obtained from micro-CT images.
The ITV of a dental implant can be used to predict the initial BIC%; this information may provide the clinician with important information on the optimal loading time.
本研究旨在确定牙种植体的峰值植入扭矩值（ITV）与骨-种植体接触百分比（BIC%）之间的相关性。
将牙科种植体插入由 2 毫米厚的人工皮质壳代表皮质骨和人工泡沫骨代表松质骨组成的标本中，皮质骨和松质骨具有四种密度（组 1 至 4-0.32、0.20、0.16 和 0.12 g/cm³）。每个带有植入物的标本均进行微计算机断层扫描（micro-CT）扫描，从中计算出 3D BIC%值。计算 ITV 和 BIC%之间的 Pearson 相关系数（r）。
组 1 至 4 的 ITV 分别为 56.2±4.6（平均值±标准差）、45.6±0.9、43.3±4.3 和 38.5±3.4 N·cm，相应的 BIC%值分别为 41.5±0.5%、39.0±1.0%、30.8±1.1%和 26.2±1.6%。ITV 和 BIC%之间的 Pearson 相关系数为 r=0.797（P<0.0001）。
初始种植体稳定性，以 ITV 定量，与从 micro-CT 图像获得的 3D BIC%呈强烈正相关。
牙种植体的 ITV 可用于预测初始 BIC%；该信息可为临床医生提供有关最佳加载时间的重要信息。
