ความแม่นของแบบจำลองฟันจากการพิมพ์สามมิติชนิดแอลซีดีในรูปแบบกลวงที่มีความหนาและการมีตะแกรงแตกต่างกัน

Abstract

Liquid crystal display (LCD) printing is the new technology applied in dentistry for dental model fabrication. Printing dental models with hollow design can reduce resin usage, but the accuracy must be considered. The purpose of this study was to evaluate the accuracy of hollow models manufactured by LCD printer with differences in thickness and the presence of a grid. The 1l different designs of hollow models consisted of solid group (control group), hollow with grid (group G) and hollow without grid (group H), and group G and group H were divided by thickness (1.0, 1.5, 2.0, 2.5, and 3.0 mm). Trueness and precision were evaluated by superimposition of 3D images of printed models in Geomagic control X software. The root-mean-square error (RMSE) and average were used in statistical analysis. The interaction of two factors was investigated by two-way ANOVA. One-way ANOVA with Dunnett's T3 multiple comparison was used to compare deviation among the groups at 95% confident interval (p<0.05). The results showed that models with thickness of 3 mm showed highest accuracy. Thickness affected both trueness and precision (F = 63.792, p = 0.000 and F = 99.082, p = 0.000 respectively), but the presence of grid affected only trueness of models (F = 447.932, p = 0.000). The trueness of hollow with grid with thickness of 1.0 - 3.0 mm and non-grid hollow with thickness of3 mm design were significantly higher than other models and comparable to solid (p<0.05). The precision of hollow models with thickness of 3 mm was significantly higher than others and comparable to solid (p<0.05).