计算机辅助设计在单侧完全性唇腭裂婴儿术前矫治中的应用

目的:评价计算机辅助设计在单侧完全性唇腭裂患儿术前矫治中的应用价值。方法:对10例单侧完全性唇腭裂新生儿取模,通过三维激光扫描仪对模型进行扫描并实现三维重建,三维诊断设计软件模拟整个错位上颌骨各骨段的矫正过程,并输出用于矫治器加工的数字模型。快速激光成型技术恢复矫治过程的模型并制作一系列矫治器,临床应用于单侧完全性唇腭裂患儿的术前矫正治疗。结果:经过3～4个月的术前矫正,错位牙槽骨排列成较为规则的弧形;唇部裂隙宽度减小,鼻翼塌陷畸形得到改善,鼻小柱偏斜得到纠正。结论:计算机辅助设计的单侧完全性唇腭裂患儿术前矫治能实现精确、量化的矫治目标,同时减少复诊次数,是一种高效、简洁的术前矫治方法。

Presurgical alveolar molding using computer aided design in infants with unilateral complete cleft lip and palate

PURPOSE: To establish a new method of presurgical alveolar molding using computer aided design(CAD) in infants with complete unilateral cleft lip and palate(UCLP).METHODS: Ten infants with complete UCLP were recruited.A maxillary impression was taken at the first examination after birth.The study model was scanned by a non-contact three-dimensional laser scanner and a digital model was constructed and analyzed to simulate the alveolar molding procedure with reverse engineering software(RapidForm 2006).The digital geometrical data were exported to produce a scale model using rapid prototyping technology.The whole set of appliances was fabricated based on these solid models.RESULTS: The digital model could be viewed and measured from any direction by the software.By the end of the NAM treatment before surgical lip repair,the cleft was narrowed and the malformation of alveolar segments was aligned normally,significantly improving nasal symmetry and nostril shape.CONCLUSIONS: Presurgical NAM using CAD could simplify the treatment procedure and estimate the treatment objective,which enabled precise control of the force and direction of the alveolar segments movement.