Accuracy of LCD Printed Hollow Models with Differences in Thickness and the Presence of Grid

Abstract

Printing dental models with hollow design can reduce resin usage, but the accuracy I must be considered. The purpose of this study was to evaluate the accuracy of hollow I models manufactured by a liquid crystal display (LCD) printer with differences in thickness I and the presence of a grid. The 10 different designs of hollow models consisted of hollow with grid (group G) and I hollow without grid (group H), and each group was divided by thickness (1.0, 1.5, 2.0, 2.5, I and 3.0 mm). Including solid design as control, all models were printed by LCD printer. I Trueness and precision were evaluated. The root-mean-square error (RMSE) and average I were used in statistical analysis. The interaction of two factors was investigated by two-way I ANOVA. One-way ANOVA with Dunnett T3 was used to compare deviation among the I groups (α=0.05). The results showed that thickness affected both trueness and precision, but the I presence of grid affected only trueness of models. The trueness of hollow with grid or nongrid hollow with thickness of 3 mm design were significantly higher than other models and I comparable to solid (p<0.05). The precision of hollow models with thickness of 3 mm was I significantly higher than others and comparable to solid (p<0.05).