Effect of Printing Direction on the Accuracy of 3D-Printed Dentures Using Stereolithography Technology.

Tamaki Hada,Ryosuke Otake,Shunsuke Minakuchi,Manabu Kanazawa,Toshio Arakida,Maiko Iwaki,Awutsadaporn Katheng,Yumika Soeda

doi:10.3390/ma13153405

Abstract

This study evaluated the effects of the differences in the printing directions of stereolithography (SLA) three-dimensional (3D)-printed dentures on accuracy (trueness and precision). The maxillary denture was designed using computer-aided design (CAD) software with an STL file (master data) as the output. Three different printing directions (0°, 45°, and 90°) were used. Photopolymer resin was 3D-printed (n = 6/group). After scanning all dentures, the scanning data were saved/output as STL files (experimental data). For trueness, the experimental data were superimposed on the master data sets. For precision, the experimental data were selected from six dentures with three different printing directions and superimposed. The root mean square error (RMSE) and color map data were obtained using a deviation analysis. The averages of the RMSE values of trueness and precision at 0°, 45°, and 90° were statistically compared. The RMSE of trueness and precision were lowest at 45°, followed by 90°; the highest occurred at 0°. The RMSE of trueness and precision were significantly different among all printing directions (p < 0.05). The highest trueness and precision and the most favorable surface adaptation occurred when the printing direction was 45°; therefore, this may be the most effective direction for manufacturing SLA 3D-printed dentures.

Highlights

With the recent and rapid advances in digital technology, new digital tools called computer-aided design (CAD) and computer-aided manufacturing (CAM) have become popular in the field of dentistry [1,2]
The root mean square error (RMSE) values of trueness were the lowest for dentures printed at 45◦ (0.086 ± 0.004 mm; p = 0.001), followed by those for dentures printed at 90◦ (0.109 ± 0.005 mm; p = 0.001) and at 0◦
There was a significant difference in the RMSE values for trueness among all printing directions (p < 0.05)

Summary

Introduction

With the recent and rapid advances in digital technology, new digital tools called computer-aided design (CAD) and computer-aided manufacturing (CAM) have become popular in the field of dentistry [1,2]. The most common method involves designing the complete denture using CAD software, milling the denture base using a denture base resin disc, and bonding the existing artificial teeth [5,6]. This method of milling a ready-made disk can be processed with high accuracy because there is no polymerization shrinkage of the material itself, it depends on the size and number

Methods

Results

Discussion

Conclusion