The 3-dimensional evaluation of validity of sample models for department of dental technology

Objectives This study aimed to analyze and evaluate that of sample model used in the dental technique training using 3-dimesional virtual models. Methods The sample models were scanned and rendered as a virtual dental models using a 3-D scanner(optoTOP-HE, Breukmann, Germany). 4 measurements were made to determine arch size(ICW, intercanine width; IMW, intermolar width; IIC, incisor to intercanine line; and IIM, incisor to intermolar line) and three measurements were made to determine occlusal curvatures(curve of Spee, curve of Wilson, and Monson’s sphere). In addition, the distance from incisor to incisive papilla(IP) was measured to investigate the relationship between upper anterior teeth and incisive papilla. All measurement values were compared with previous studies which used the same measurement parameters. Intra-rater reliability was evaluated for all parameters using ICC, revealing excellent coefficient values(ICC = 0.999, p<.001). Results ICW/IMW(arch width) and IIC/IIM(arch length) were smaller in the both upper and lower sample models except for ICW/IMW in the upper model. Curve of Spee was shallower and the radius of Monson’s sphere were smaller in the lower sample model, as well. In addition, IP was shorter and tend to be located more anterior compared to previous studies. Conclusions These results suggested that the sample models were smaller than average sizes reported in the previous studies, and incisive papilla in the sample model was located more anterior in the palate. This finding could be used as a meaningful reference for improving sample models of dental technique training.