Int J Oral Maxillofac Implants. 2014 Jan-Feb;29(1):178-84. doi: 10.11607/jomi.3236.
The purpose of this study was to evaluate the three-dimensional radiographic changes of 100% anorganic bovine bone xenograft volume in a grafted maxillary sinus, based on a computerized analysis of cone-beam computed tomography (CBCT) scan.
A maxillary sinus augmentation procedure done with a lateral approach using 100% anorganic bovine bone was performed in 20 patients. A CBCT scan of the grafted area was taken immediately after the procedure (T1) and 8 to 9 months later (T2). CBCT scan data were analyzed with image processing software to evaluate differences in the volume of grafted material between T1 and T2. Residual ridge height and width were also measured at T1.
The mean residual bone height and width at the implant sites was 4.40±0.87 mm and 7.9±2.22 mm, respectively. The mean graft volume was 1,432±539 mm³ and 1,287±498 mm³ at T1 and T2, respectively. A significant difference in graft volume was found between T1 and T2 data by paired t test (P=.01). The mean ratio between the volume at T2 and the volume at T1 was 0.90±0.12, meaning a graft volume contraction of 10%.
Within the limits of the present investigation, good stability of anorganic bovine bone graft volume up to 8 months after the grafting procedure was demonstrated. Three-dimensional computed tomographic volumetric assessment seems to be a promising approach to quantify long-term changes in the regenerated area.
本研究旨在通过计算机化分析锥形束 CT（CBCT）扫描，评估上颌窦中 100%牛骨同种异体移植物体积的三维放射影像学变化。
对 20 例患者进行了经外侧入路的上颌窦提升术，使用 100%牛骨同种异体移植物。在手术后即刻（T1）和 8-9 个月后（T2），对移植区域进行 CBCT 扫描。使用图像处理软件对 CBCT 扫描数据进行分析，以评估 T1 和 T2 之间移植材料体积的差异。在 T1 时还测量了剩余牙槽嵴的高度和宽度。
种植部位的平均剩余骨高度和宽度分别为 4.40±0.87mm 和 7.9±2.22mm。T1 和 T2 时的平均移植物体积分别为 1432±539mm³和 1287±498mm³。配对 t 检验显示 T1 和 T2 数据之间的移植物体积有显著差异（P=.01）。T2 时的体积与 T1 时的体积之比的平均值为 0.90±0.12，这意味着移植物体积收缩了 10%。
在本研究范围内，证明了在移植手术后 8 个月内牛骨同种异体移植物体积具有良好的稳定性。三维 CT 容积评估似乎是一种很有前途的方法，可以定量评估再生区域的长期变化。
