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KMID : 1023820200120040225
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The Journal of Advanced Prosthodontics
2020 Volume.12 No. 4 p.225 ~ p.232
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Marginal and internal fit of 3D printed provisional crowns according to build directions
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Ryu Ji-Eun
Kim Yu-Lee
Kong Hyun-Jun
Chang Hoon-Sang
Jung Ji-Hye
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Abstract
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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°.
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KEYWORD
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Crowns, Printing, Three-dimensional, Dental marginal adaptation, Dental internal fit
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