Steffensen B, Webert H P
Department of Periodontics, University of Texas Health Science Center, San Antonio.
J Periodontol. 1989 May;60(5):248-54. doi: 10.1902/jop.1989.60.5.248.
This study radiographically evaluated the correlation between the changes in alveolar bone level occurring in bony defects after periodontal therapy and the corresponding pretreatment defect angles. The defect angle was defined by the bony defect surface and the root surface. The changes were determined from identically exposed and processed radiographs obtained just prior to surgery and 15 to 18 months later. The defect angle was clearly correlated to the radiographic changes in alveolar bone level. Most defects with an angle less than 45 degree showed a gain of bone while defects with the largest defect angles showed a loss. In addition, defects on root surfaces without furcations showed better healing than defects associated with furcations.
本研究通过影像学评估了牙周治疗后骨缺损处牙槽骨水平的变化与相应治疗前缺损角度之间的相关性。缺损角度由骨缺损表面和牙根表面确定。变化情况是根据手术前及15至18个月后获取的曝光和处理条件相同的X光片来确定的。缺损角度与牙槽骨水平的影像学变化明显相关。大多数角度小于45度的缺损显示有骨量增加，而缺损角度最大的缺损则显示有骨量丧失。此外，无根分叉牙根表面的缺损比与根分叉相关的缺损愈合情况更好。
