Marginal and Internal Adaptation of Zirconium Dioxide Ceramic Copings and Crowns with Different Finish Line Designs

• KOMINE Futoshi

  Department of Fixed Prosthodontics, Nihon University School of Dentistry Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry

• IWAI Takayuki

  Department of Fixed Prosthodontics, Nihon University School of Dentistry

• KOBAYASHI Kazuhisa

  Department of Fixed Prosthodontics, Nihon University School of Dentistry

• MATSUMURA Hideo

  Department of Fixed Prosthodontics, Nihon University School of Dentistry Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry

Abstract

The present study evaluated the marginal and internal adaptation of single-tooth zirconium dioxide (ZrO₂) ceramic copings or crowns with three different finish line designs. Twenty-four steel dies were prepared for maxillary central incisor crowns with the following finish line designs: shoulder (S), rounded shoulder (RS), and chamfer (C) preparations. Twenty-four standardized ZrO₂ ceramic copings were manufactured with a CAD/CAM system (Cercon Smart Ceramics), and the crowns were finalized by veneering with a feldspathic ceramic. Measurements for marginal and internal adaptation were performed at two stages: the copings and the completed crowns. No significant differences were observed between the three groups in terms of marginal discrepancy median value: S, 73/69; RS, 61/60; C, 64/55 (μm). However, significant differences in internal adaptation were widely found among all groups: S, 117/111; RS, 72/75; C, 56/57 (μm). As for intra-group comparisons of marginal and internal adaptation values for all groups, the differences were not significant. It was found that the finish line design seemingly wielded no influence on marginal adaptation of single-tooth ZrO₂ ceramic copings and crowns. It was also observed that the marginal and internal adaptation values in the present study were all within the clinically acceptable range.

Journal

• Dental Materials Journal

  Dental Materials Journal 26 (5), 659-664, 2007

  The Japanese Society for Dental Materials and Devices

Keywords

• Adaptation
• Zirconium dioxide
• Finish line

Details

• CRID: 1390001204715465728
• NII Article ID: 110006402825
• NII Book ID: AA10443149
• DOI: 10.4012/dmj.26.659
• COI: 1:CAS:528:DC%2BD2sXhsVKns7rE
• ISSN: 18811361
• ISSN: 02874547
• Web Site: https://www.jstage.jst.go.jp/article/dmj/26/5/26_5_659/_pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10745065
• Web Site: https://search.jamas.or.jp/link/ui/2008170773
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • NDL-Digital
  • CiNii Articles
• Abstract License Flag: Disallowed