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目的:分析建立上牙颌模型的锥形束CT和激光快速成型技术的可靠性。方法:收集20例正畸患者的牙颌石膏模型和锥形束CT数据,将CT数据重建成三维数字模型(即3-D模型),并应用激光快速成型技术加工出牙颌树脂模型(即RP模型)。对石膏、3-D和RP模型分别进行牙冠宽度、牙弓宽度、牙弓长度等测量,利用SPSS17.0软件包进行统计学分析。结果:3种模型之间,除牙弓宽度外,其余大部分指标具有显著差异(P<0.05);3-D模型值普遍小于石膏模型和RP模型(P<0.05);RP模型与石膏模型之间大部分指标不具有显著差异(P>0.05);RP、3-D模型与石膏模型之间的回归系数均具有显著差异(P<0.01),且前者普遍大于后者。结论:3种模型之间具有高度一致性,存在可为临床所接受的差异,提示3-D模型和RP模型具备替代石膏模型的可能性,从而节约存储空间,提高工作效率。
OBJECTIVE: To analyze the reliability of the cone beam CT and laser rapid prototyping technique for the establishment of maxillary maxilla model. Methods: Tooth and mandibular casts and cone beam CT data of 20 orthodontic patients were collected. The CT data were reconstructed into three-dimensional digital model (ie, 3-D model) and processed by laser rapid prototyping RP model). The plaster, 3-D and RP models were used to measure the crown width, dental arch width and dental arch length, respectively. The data were analyzed by SPSS17.0 software package. Results: The 3-D model values were generally less than those of gypsum model and RP model (P <0.05) except for the width of dental arch between the three models (P <0.05) (P> 0.05). The regression coefficients between RP, 3-D model and gypsum model had significant difference (P <0.01), and the former was generally higher than the latter. CONCLUSIONS: There is a high degree of agreement among the three models, with clinically acceptable differences, suggesting that 3-D models and RP models have the potential to replace gypsum models, saving storage space and increasing productivity.