Grinding of composite cores using diamond burs with different grit sizes

the effects on the retentive strength of zirconia crowns

Keywords: Composite resin, Dental bonding, Dental retention, Surface properties, Zirconium

Abstract

Aim: To evaluate the retention of Y-TZP crowns cemented in aged composite cores ground with burs of different grit sizes. Methods: Sixty composite resin simplified full-crown preparations were scanned, while 60 Y-TZP crowns with occlusal retentions were milled. The composite preparations were stored for 120 days (wet environment-37°C) and randomly distributed into three groups (n=20) according to the type of composite core surface treatment. The groups were defined as: CTRL (control: No treatment), EFB (extra-fine diamond bur [25μm]), and CB (coarse diamond bur [107μm]). The grinding was performed with an adapted surveyor standardizing the speed and pressure of the grinding. The intaglio surfaces on the crowns were air-abraded with silica-coated alumina particles (30 μm) and then a silane was applied. The crowns were cemented with self-adhesive resin cement, thermocycled (12,000 cycles; 5/55°C), stored (120 days) and submitted to a
retention test (0.5mm/min). The retentive strength data (MPa) were analyzed using one-way analysis of variance and Tukey test, as well as Weibull analysis. Failures were classified as 50C (above 50% of cement in the crown), 50S (above 50% of cement in the substrate) and COE (composite core cohesive failure). Results: No statistical difference was observed among the retention values (p=0.975). However, a higher Weibull modulus was observed in the CTRL group. The predominant type of failure was 50S (above 50% of cement in the substrate composite). Conclusion: The retention of zirconia crowns was not affected by grinding using diamond burs with different grit sizes (coarse/extra-fine) or when no grinding was performed.

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Author Biographies

Vinicius Felipe Wandscher, Franciscan University

Prosthodontic Unit of the Faculty of Odontology, Franciscan University, Santa Maria, Rio Grande do Sul, Brazil.

Ana Maria Estivalete Marchionatti, CNEC Faculty of Santo Angelo

Prosthodontic Unit of the Faculty of Odontology, CNEC Faculty of Santo Angelo, Santo Angelo, Rio Grande do Sul, Brazil.

Damiano Lodi Giuliani, University of Bologna

Department of Biomedical Sciences and Neuromotor, Division of Prosthodontics, Alma Mater Studiorum of the University of Bologna, Italy.

Roberto Scotti, University of Bologna

Department of Biomedical Sciences and Neuromotor, Division of Prosthodontics, Alma Mater Studiorum of the University of Bologna, Italy.

Paolo Baldissara, University of Bologna

Department of Biomedical Sciences and Neuromotor, Division of Prosthodontics, Alma Mater Studiorum of the University of Bologna, Italy.

Luiz Felipe Valandro, Federal University of Santa Maria

Department of Restorative Dentistry of the Faculty of Odontology, Federal University of Santa Maria, Rio Grande do Sul, Brazil.

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Published
2020-03-09
How to Cite
Wandscher, V. F., Marchionatti, A. M. E., Giuliani, D. L., Scotti, R., Baldissara, P., & Valandro, L. F. (2020). Grinding of composite cores using diamond burs with different grit sizes. Brazilian Journal of Oral Sciences, 19, e201574. https://doi.org/10.20396/bjos.v19i0.8658335

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