腭裂术后裂隙内骨桥长度与牙He横向发育

目的 研究腭裂术后腭裂隙内骨桥形成现象对牙He横向生长发育的影响。方法 随机选取13-28岁单侧完全性唇腭裂术后患者31例。行冠状位CT检查确定腭裂隙内骨桥形成长度后，在牙He石膏模型上分别定点测量牙弓宽度、骨基宽度和牙弓协调度，计算各项测量指标的均值，分析骨桥形成长度与牙He生长发育的关系，并行统计学检验。结果 在腭裂术后骨桥形成长度8mm以上组，其骨基宽度，尤其是牙弓后份的骨基宽度发育明显优于骨桥形成量小于8mm组。在双尖牙区，有效长度的骨桥形成组的牙弓宽度明显大于对照组，而在磨牙区，两组均值间差异无显著性。在双尖牙区，骨桥形成不良者出现较为明显的反He倾向；在磨牙区，骨桥形成不良者并不因此而发生咬合关系紊乱。结论 腭裂术后腭裂隙内骨桥形成的现象明显影响牙He生长发育，对骨基宽度、牙弓宽度和牙弓协调度的发育均有支持作用。骨桥形成影响牙He生长发育的临界长度为4mm，有效长度为8mm。

The influence of the osteogenesis in cleft palate after palatal surgery to the transverse growth of dental occlusion]

OBJECTIVE: To compare the transverse growth of the dental cast following palatal surgery with or without osteogenesis in palatal gap. METHODS: 31 patients at 13 - 28 years old with repaired palate were selected to take the dental cast, the width of the dental arch, alveolar base and the matching degree between arches were measured and the average was calculated. After the length of the bone bridge in palate was measured through CT scan, the relationship between the osteogenesis in palatal gap and the transfers growth of dental cast was studied. RESULTS: The critical length of the bone regeneration in palatal gap to affect the dental growth is 4 mm, mean while the sufficient length is 8 mm. The group of sufficient bone bridge has a better development in both the width of dental alveolar base and that of dental arch and the matching degree than the group of unsurficience. And this intendance was more obvious in premolar region than in molar region. CONCLUSIONS: The osteogenesis in palatal gap following palatal surgery can strongly support the transfers growth in the width of dental arch, the width of alveolar base and the matching degree between upper and lower dental arch.