Fit of metal-ceramic crowns

effect of coping fabrication method and veneering ceramic application

Authors

DOI:

https://doi.org/10.20396/bjos.v21i00.8665136

Keywords:

Dental marginal adaptation, Crowns, Metal ceramic alloys, Ceramics

Abstract

Aim: To evaluate the influence of cobalt-chromium (Co-Cr) coping fabrication methods and ceramic application on the marginal and internal fit of metal-ceramic crowns. Methods: Co-Cr copings for metal-ceramic crowns were prepared by lost wax casting or CAD-CAM machining of sintered blocks. The fit was analyzed using the silicone replica technique at four assessment points: marginal gap (MG), axial wall (AW), axio-occlusal (AO) angle, and central occlusal (CO) wall. After the initial analysis, the copings were ceramic-veneered with the layering technique, and the fit was again determined. Data were statistically analyzed by paired and unpaired Student’s-t test (α=0.05). Results: Marginal and internal fit before ceramic application according to the coping manufacturing method showed significant differences only at CO (p < 0.001), with milled copings (137.98±16.71 μm) showing higher gap values than cast copings (112.86±8.57 μm). For cast copings, there were significant differences at MG (before 109.13±8.79 μm; after 102.78±7.18 μm) and CO (before 112.86±8.57 μm; after 104.07±10.63 μm) when comparing the fit before and after ceramic firing. For milled copings, there was significant difference only at AO (before 116.39±9.64 μm; after 108.54±9.26 μm). Conclusion: This study demonstrated that the coping fabrication method influenced the internal fit. Ceramic firing maintained or improved the fit of the metal-ceramic crowns. The marginal discrepancy of all restorations, before and after ceramic firing, can be considered clinically acceptable.

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Author Biographies

Patrícia Valéria Manozzo Kunz, Positivo University

School of Health Sciences, Graduate Program in Dentistry, Positivo University, Curitiba, Brazil.

Gabriela Andrade Serpa, Positivo University

School of Health Sciences, Graduate Program in Dentistry, Positivo University, Curitiba, Brazil.

Leonardo Fernandes da Cunha, University of Brasilia

Department of Dentistry, School of Health Sciences, University of Brasilia, Brasilia, Brazil.

Gisele Maria Correr, Positivo University

School of Health Sciences, Graduate Program in Dentistry, Positivo University, Curitiba, Brazil.

Carla Castiglia Gonzaga, Positivo University

School of Health Sciences, Graduate Program in Dentistry, Positivo University, Curitiba, Brazil.

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Published

2021-08-27

How to Cite

1.
Manozzo Kunz PV, Serpa GA, Cunha LF da, Correr GM, Gonzaga CC. Fit of metal-ceramic crowns: effect of coping fabrication method and veneering ceramic application. Braz. J. Oral Sci. [Internet]. 2021Aug.27 [cited 2021Nov.30];21(00):e225136. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8665136

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