Effect of thickness and CAD-CAM material on fatigue resistance of endodontically treated molars restored with occlusal veneers

Autor(es)

Noronha, Mayara dos Santos ; de Carvalho, Marco Aurelio ; Anh Quynh Do ; de Araujo Neto, Vitaliano Gomes ; Campos, Camila Heitor ; Giannini, Marcelo ; Magne, Pascal

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY; v. 32, n. 2, p. 11-pg., 2022-10-02.

Resumo

Purpose To evaluate the influence of the thickness and type of computer-aided design and computer-aided manufacturing (CAD-CAM) material on the fatigue resistance and failure mode of endodontically treated teeth (ETT) restored with occlusal veneers (OV). Materials and methods Seventy-five (N = 75) ETT were restored with Herculite XRV in the endodontic access. Five experimental groups (n = 15) were tested. Four groups had two different thicknesses (0.6-0.7 mm or 1.4-1.6 mm) and two different CAD-CAM materials: zirconia-reinforced lithium-silicate (LS/Celtra Duo) and composite resin (RC/Cerasmart). The fifth group (control) did not have occlusal veneers. All the specimens were subjected to accelerated fatigue (5 Hz frequency) with an occlusal load increasing up to 1800 N and 131,000 cycles. The number of cycles was recorded when the machine stopped or at the completion of the test. Fatigue resistance was analyzed using the Kaplan-Meier survival test (95% significance level, log-rank post hoc pairwise comparisons). The samples were categorized according to failure mode. The CAD-CAM materials were examined through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Results No differences were found between the thicknesses, regardless of the type of the CAD-CAM material. The thick LS OV outperformed the RC and control groups. The thin RC OV and control groups showed a higher percentage of repairable and possibly repairable failures than the other groups. LS was more homogeneous under SEM, and the EDS analysis detected Si and Zr, but not Li. Conclusions A larger thickness did not improve the resistance of the CAD-CAM materials. Thick LS showed a higher cumulative survival rate to fatigue than the RC and control groups. The direct composite alone (control) survived similarly to the experimental groups, except for the thick LS. (AU)

• Processo FAPESP: 17/04257-7 - Efeito da espessura e do tipo de material protético na resistência à fadiga e à carga máxima suportada por restaurações indiretas de coroas totais e overlays confeccionadas com sistema CAD/CAM
• Beneficiário: Mayara dos Santos Noronha
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/02461-0 - Resistência à fadiga e à carga máxima suportada por restaurações indiretas confeccionadas com sistema CAD/CAM: avaliação de materiais protéticos e procedimentos adesivos de cimentação
• Beneficiário: Marcelo Giannini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/11658-3 - Efeito da Espessura e do Tipo de Material Protético na Resistência à Carga Máxima e Fadiga de Molares Tratados Endodonticamente Restaurados com Overlays do tipo CAD/CAM
• Beneficiário: Mayara dos Santos Noronha
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado