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http://dx.doi.org/10.4047/jap.2020.12.4.225

Marginal and internal fit of 3D printed provisional crowns according to build directions  

Ryu, Ji-Eun (Department of Prosthodontics, School of Dentistry, Wonkwang University)
Kim, Yu-Lee (Department of Prosthodontics, School of Dentistry, Wonkwang University)
Kong, Hyun-Jun (Department of Prosthodontics, School of Dentistry, Wonkwang University)
Chang, Hoon-Sang (Department of Conservative Dentistry, School of Dentistry, Chonnam National University)
Jung, Ji-Hye (Department of Prosthodontics, School of Dentistry, Wonkwang University)
Publication Information
The Journal of Advanced Prosthodontics / v.12, no.4, 2020 , pp. 225-232 More about this Journal
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 using a 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°.
Keywords
Crowns; Printing; Three-dimensional; Dental marginal adaptation; Dental internal fit;
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