Effect of firing procedures and layering thickness of porcelain on internal adaptation of zirconia cantilever resin-bonded fixed dental prostheses
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- Kitani Jin
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan
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- Komine Futoshi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan
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- Kusaba Kosuke
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan
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- Nakase Daishi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan
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- Ito Keigo
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan
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- Matsumura Hideo
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan
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Abstract
<p>Purpose: This study evaluated the influence of firing procedures and layering thickness of porcelain on internal adaptation of maxillary anterior cantilever zirconia resin-bonded fixed dental prostheses (RBFDPs).</p><p>Methods: The maxillary right central incisor on a model was prepared for a single-retainer zirconia RBFDP. A total of 36 frameworks of cantilever zirconia RBFDPs were classified into three groups (CB0.5, CB1.0, and CB2.0 groups) based on the thickness of the cut-back on the facial surface (0.5 mm, 1.0 mm, and 2.0 mm, respectively). Feldspathic porcelain was layered onto the facial surface of the zirconia RBFDP frameworks. Internal space widths between the abutment tooth and the framework were measured before and after porcelain firing by a replica technique. The internal space values before and after porcelain firings were compared using the paired t-test within the same group (α = 0.05). Differences in internal space values (distortion) between before and after porcelain firing were compared using one-way analysis of variance and Tukey multiple comparison tests.</p><p>Results: For all framework designs, internal space values after porcelain firing were significantly higher than those before firing. Among all groups, the CB0.5 group showed the lowest internal distortion values for the whole measured area. The CB2.0 group showed higher distortion values than the CB1.0 group.</p><p>Conclusion: Porcelain firing procedures negatively impacted the internal space in cantilever zirconia RBFDPs. In addition, the increased volume of layering porcelain had a negative effect on the internal distortion of maxillary anterior cantilever zirconia RBFDPs.</p>
Journal
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- Journal of Prosthodontic Research
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Journal of Prosthodontic Research 66 (2), 333-338, 2022
Japan Prosthodontic Society