Marginal and internal fit of 3D printed provisional crowns according to build directions
10.4047/jap.2020.12.4.225
- Author:
Ji-Eun RYU
1
;
Yu-Lee KIM
;
Hyun-Jun KONG
;
Hoon-Sang CHANG
;
Ji-Hye JUNG
Author Information
1. Department of Prosthodontics, School of Dentistry, Wonkwang University, Iksan, Republic of Korea
- Publication Type:Original Article
- From:The Journal of Advanced Prosthodontics
2020;12(4):225-232
- CountryRepublic of Korea
-
Abstract:
PURPOSE:. This study aimed to fabricate provisional crowns at varying build directions using the digital light processing (DLP)-based 3D printing and evaluate the marginal and internal fit of the provisional crowns using the silicone replica technique (SRT). MATERIALS AND METHODS. The prepared resin tooth was scanned and a single crown was designed using computer-aided design (CAD) software. Provisional crowns were printed usinga DLP-based 3D printer at 6 directions (120°, 135°, 150°, 180°, 210°, 225°) with 10 crowns in each direction. In total, sixty crowns were printed. To measure the marginal and internal fit, a silicone replica was fabricated and the thickness of the silicone impression material was measured using a digital microscope. Sixteen reference points were set and divided into the following 4 groups: marginal gap (MG), cervical gap (CG), axial gap (AG),and occlusal gap (OG). The measurements were statistically analyzed using one-way ANOVA and Dunnett T3.
RESULTS:MG, CG, and OG were significantly different by build angle groups (P<.05). The MG and CG were significantly larger in the 120° group than in other groups. OG was the smallest in the 150° and 180° and the largest in the 120° and 135° groups.
CONCLUSION:The marginal and internal fit of the 3D-printed provisional crowns can vary depending on the build angle and the best fit was achieved with build angles of 150°and 180°
