The Influence of Dental Virtualization, Restoration Types, and Placement Angles on the Trueness and Contact Space in 3D-Printed Crowns: A Comprehensive Exploration
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Published:2023-12-19
Issue:1
Volume:12
Page:2
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ISSN:2304-6767
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Container-title:Dentistry Journal
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language:en
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Short-container-title:Dentistry Journal
Author:
Lu Tsung-Yueh1, Lin Wei-Chun234ORCID, Yang Tzu-Hsuan2, Sahrir Citra Dewi1ORCID, Shen Yung-Kang2ORCID, Feng Sheng-Wei15ORCID
Affiliation:
1. School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan 2. School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan 3. Department of Dentistry, Wan-Fang Hospital, Taipei Medical University, Taipei 116, Taiwan 4. Center for Tooth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei 110, Taiwan 5. Division of Prosthodontics, Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
Abstract
The current digital dentistry workflow has streamlined dental restoration production, but the effectiveness of digital virtual design and 3D printing for restorations still needs evaluation. This study explores the impact of model-free digital design and 3D-printing placement angles on restorations, including single crowns and long bridges produced with and without casts. The restorations are 3D printed using resin at placement angles of 0°, 60°, and 90°. Each group of samples was replicated ten times, resulting in a total of 120 restorations. The Root Mean Square Error (RMSE) value was used to evaluate the surface integrity of the restoration. In addition, the contact space, edge gap, and occlusal space of restorations produced by different processes were recorded. The results indicate that there was no significant difference in the RMSE value of the crown group (p > 0.05). Changing the bridge restoration angle from 0° to 90° resulted in RMSE values increasing by 2.02 times (without casts) and 2.39 times (with casts). Furthermore, the marginal gaps in the crown group were all less than 60 μm, indicating good adaptation. In contrast, the bridge group showed a significant increase in marginal gaps at higher placement angles (p > 0.05). Based on the findings, virtual fabrication without casts does not compromise the accuracy of dental restorations. When the position of the long bridge exceeds 60 degrees, the error will increase. Therefore, designs without casts and parallel placement result in higher accuracy for dental restorations.
Subject
General Dentistry
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