In the present study, we evaluated the difference between the conventional impression method using impression material and the IEOS technique in reproducing the morphology of the surface of the pontic of a definitive FPD. The intra- and extra-oral scanning (IEOS) technique, a method for accurately reproducing the submucosal morphology of the superstructure of an implant, has been reported using an intraoral scanner. When taking the final impression for a three-unit fixed partial denture (FPD), the intaglio surface of the pontic of provisional restoration cannot be transferred accurately to that of definitive restoration. In the manufacturing process of interim dental crowns, 3D printing technologies showed superior and uniform manufacturing accuracy than milling technology. In the milling group, there was a significant difference in trueness according to the location of the intaglio surface (p < 0.001). There were significant differences in intaglio surface trueness between the three different fabrication technologies, and high trueness values were observed in the milling group (p < 0.05). Statistical analysis was validated using one-way analysis of variance and Tukey HSD test (α = 0.05). The alignment and 3D comparison of CRM and CTM were performed based on the intaglio surface using a 3D inspection software program (Geomagic Control X). The fabricated interim dental crowns were obtained via 3D modeling of the intaglio surface using a laboratory scanner and designated as CAD test models (CTMs). Interim dental crowns were fabricated based on CRM using two types of 3D printer technologies (stereolithography apparatus and digital light processing) and one type of milling machine (n = 15 per technology). Dental crown was designated and assigned as a computer-aided design (CAD) reference model (CRM). All rights reserved.This study aimed to evaluate the intaglio surface trueness of interim dental crowns fabricated with three 3-dimensional (3D) printing and milling technologies. The tooth type affected the margin quality according to the build angle, except in the case of first premolars.Ĭopyright © 2020 Editorial Council for the Journal of Prosthetic Dentistry. The recommended build angle for interim crowns fabricated using 3D printing is between 150 and 210 degrees. In 3D printing, the build angle affected the intaglio surface trueness of the interim crown. The worst margin quality observed in all teeth was at 180 degrees. The margin quality was significantly different as per the build angle in the central incisor and the first molar (P<.05). The central incisor and first premolar showed the lowest RMS value at 180 degrees, and the first molar showed the lowest RMS value at 210 degrees. The RMS value showed significant differences in the various types of tooth as per the build angles (P<.001). Statistical analysis was performed using 1-way ANOVA, 2-way ANOVA, and the Tukey honestly significant difference post hoc test (α=.05). In addition, a grading system was developed to evaluate the margin quality, which was assessed visually. CRM and CTM used 3D inspection software to analyze the intaglio surface superimposition and root mean square (RMS). The intaglio surface of the printed interim crown was digitized. ![]() For CAD test model (CTM) production, 3D printing was performed in accordance with the type of tooth (maxillary central incisor, first premolar, and first molar) and the build angles (90, 120, 135, 150, 180, 210, 225, 240, and 270 degrees) (n=17). The purpose of this in vitro study was to evaluate the effects of intaglio surface trueness and margin quality in accordance with the type of tooth and the build angles of interim crowns fabricated by SLA 3D printing.Ī definitive cast was digitized for computer-aided design (CAD) reference model (CRM) production, and the interim crown was designed by using a CAD software program and saved as a standard tessellation language (STL) file. ![]() Studies on the intaglio surface trueness and margin quality of interim crowns fabricated using stereolithography apparatus (SLA) 3D printing depending on the type of tooth and the build angle are lacking.
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