Ye Hongqiang, Ning Jing, Li Man, Niu Li, Yang Jian, Sun Yuchun, Zhou Yongsheng
Int J Prosthodont. 2017 Jul/Aug;30(4):348-353. doi: 10.11607/ijp.5270.
The aim of this study was to explore the application of computer-aided design and rapid prototyping (CAD/RP) for removable partial denture (RPD) frameworks and evaluate the fitness of the technique for clinical application.
Three-dimensional (3D) images of dentition defects were obtained using a lab scanner. The RPD frameworks were designed using commercial dental software and manufactured using selective laser melting (SLM). A total of 15 cases of RPD prostheses were selected, wherein each patient received two types of RPD frameworks, prepared by CAD/RP and investment casting. Primary evaluation of the CAD/RP framework was performed by visual inspection. The gap between the occlusal rest and the relevant rest seat was then replaced using silicone, and the specimens were observed and measured. Paired t test was used to compare the average thickness and distributed thickness between the CAD/RP and investment casting frameworks. Analysis of variance test was used to compare the difference in thickness among different zones.
The RPD framework was designed and directly manufactured using the SLM technique. CAD/RP frameworks may meet the clinical requirements with satisfactory retention and stability and no undesired rotation. Although the average gap between the occlusal rest and the corresponding rest seat of the CAD/RP frameworks was slightly larger than that of the investment casting frameworks (P < .05), it was acceptable for clinical application.
RPD frameworks can be designed and fabricated directly using digital techniques with acceptable results in clinical application.
本研究旨在探讨计算机辅助设计与快速成型（CAD/RP）技术在可摘局部义齿（RPD）支架中的应用，并评估该技术在临床应用中的适用性。
使用实验室扫描仪获取牙列缺损的三维（3D）图像。采用商用牙科软件设计RPD支架，并使用选择性激光熔化（SLM）技术制造。共选取15例RPD修复体病例，每位患者均接受两种类型的RPD支架，分别由CAD/RP技术和熔模铸造法制备。通过目视检查对CAD/RP支架进行初步评估。然后用硅橡胶填充咬合支托与相应支托窝之间间隙，对标本进行观察和测量。采用配对t检验比较CAD/RP支架与熔模铸造支架的平均厚度和厚度分布。采用方差分析检验比较不同区域厚度的差异。
采用SLM技术直接设计并制造了RPD支架。CAD/RP支架可满足临床要求，固位和稳定性良好，无不良旋转。虽然CAD/RP支架的咬合支托与相应支托窝之间的平均间隙略大于熔模铸造支架（P <.05），但在临床应用中是可以接受的。
RPD支架可直接采用数字技术设计和制造，临床应用效果可接受。
