Dermaut L R, Goeffers K R, De Smit A A
Am J Orthod Dentofacial Orthop. 1986 Sep;90(3):204-10. doi: 10.1016/0889-5406(86)90067-3.
Two groups of patients were selected from the State University Dental School in Ghent--an experimental group with tooth agenesis and a control group with complete dentitions. Skeletal anomalies were diagnosed by means of lateral cephalograms according to the Sassouni analysis. The amount of crowding was measured on standardized photographs by Little's Irregularity Index. The prevalence of Class I skeletal relationship appeared to be significantly higher in the agenesis group than in the control group. Skeletal deep- and normal-bite cases occurred more often in patients with hypodontia than in the control group. As far as crowding was concerned, it was less pronounced in the hypodontia group (lateral segments) than in the control group. This conclusion held true only when the "amount" of crowding was not taken into account.
从根特州立大学牙科学院选取了两组患者——一组为牙发育不全的实验组，另一组为牙列完整的对照组。根据萨苏尼分析法，通过头颅侧位片诊断骨骼异常。采用利特尔不规则指数在标准化照片上测量牙列拥挤程度。结果显示，牙发育不全组I类骨骼关系的患病率显著高于对照组。与对照组相比，牙列缺损患者中骨骼深覆合和正常覆合病例更为常见。就牙列拥挤而言，牙列缺损组（侧段）的拥挤程度低于对照组。仅在不考虑拥挤“量”的情况下，这一结论才成立。
