Mechanical Behavior of Ceramic Monolithic Systems With Different Thicknesses

Autor(es)

Longhini, D. ^[1] ; Rocha, C. O. M. ^[1] ; de Oliveira, L. T. ^[1] ; Olenscki, N. G. ^[1] ; Bonfante, E. A. ^[2] ; Adabo, G. L. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, Araraquara - Brazil

^[2] Univ Sao Paulo, Dept Prosthodont & Periodontol, Bauru - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 44, n. 5, p. E244-E253, SEP-OCT 2019.
• Citações Web of Science: 0

Resumo

Objectives: This study assessed the fully stabilized zirconia (FSZ) Prettau Anterior, the partially stabilized zirconia (PSZ) Prettau, and the lithium disilicate IPS e.max CAD (LD) through microstructural and mechanical characterization and effect of thickness on fracture load of the ceramics. Methods and Materials: Disk-shaped specimens (12 mm diameter and 1.2 mm thickness) were prepared for biaxial flexural strength (BFS) and Weibull statistics (n=30). For the fracture load static test (FLST) and Weibull statistics (n=30), disk-shaped specimens 12 mm in diameter and thicknesses of 0.5 mm, 1 mm, and 1.5 mm were cemented on an epoxy-resin substrate. Results: BFS (MPa) results were PSZ: 683.0 +/- 70.23; FSZ: 438.6 +/- 64.1; and LD: 248.6 +/- 37.3. One-way analysis of variance (ANOVA) for BFS was significant (p<0.001), and the Tukey post hoc test showed differences among all ceramics. There was difference in characteristic strength, but there was no difference in Weibull modulus. Two-way ANOVA for FLST was significant for ceramic (p<0001), thickness (p<0001), and interaction (p<0001). There was no difference among all ceramics at the 0.5 mm thickness. PSZ had higher values for the 1.0 mm and 1.5 mm thicknesses. LD of 1.5 mm thickness exhibited a higher FLST than FSZ. Conclusions: PSZ had the highest BFS, but when cemented on a substrate, all ceramics with 0.5 mm thickness behaved similarly. Despite the lower BFS, LD had a fracture load similar or superior to FSZ when cemented on a substrate. (AU)

• Processo FAPESP: 16/09640-0 - Caracterização mecânica e microestrutural de zircônias monolíticas e di-silicato de lítio e estudo de fadiga acelerada progressiva de coroas com diferentes espessuras de cerâmica
• Beneficiário: Gelson Luis Adabo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/16927-7 - Propriedades ópticas e resistência à fratura de zircônias monolíticas e dissilicato de lítio com diferentes espessuras
• Beneficiário: Nicole Grigolatto Olenscki
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 17/08411-0 - Caracterização mecânica, microestrutural e influência da espessura nas propriedades ópticas de zircônias monolíticas e dissilicato de lítio
• Beneficiário: Lucas Torres de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica