Avaliação da tenacidade à fratura de diferentes sistemas cerâmicos
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Data
2003
Autores
Pagani, Clovis [UNESP]
Miranda, Carolina Baptista
Bottino, Marco Cícero
Título da Revista
ISSN da Revista
Título de Volume
Editor
Journal Of Applied Oral Science : Revista Fob
Resumo
Although ceramics present high compressive strength, they are brittle materials due to their low tensile strength so they have lower capacity to absorb shocks. This study evaluated the fracture toughness of different ceramic systems, which refers to the ability of a friable material to absorb defformation energy. Three ceramic systems were investigated. Ten cylindrical samples (5,0mm x 3,0mm), were obtained from each ceramic material as follows: G1- 10 samples of Vitadur Alpha (Vita-Zahnfabrik); G2- 10 samples of IPS Empress2 (Ivoclar-Vivadent); G3- 10 samples of In-Ceram Alumina (Vita-Zahnfabrik). Fracture toughness values were collected upon indentation tests that were performed under a heavy load. A microhardness tester (Digital Microhardness Tester FM) utilized a 500gf load cell during 10seconds to perform four impressions on each sample. Statistically significant results were observed (ANOVA and Kruskal-Wallis tests). In-Ceram Alumina presented the highest median toughness values (2,96N/m3/2), followed by Vitadur Alpha (2,08N/m3/2) and IPS Empress2 (1,05N/m3/2). It may be concluded that different ceramic systems present distinct fracture toughness values, thus In-Ceram is capable of absorbing superior stress when compared to Vitadur Alpha and IPS Empress2.
Descrição
Palavras-chave
Dental ceramics, Fracture toughness, and Indentation method, Cerâmicas odontológicas, Tenacidade à fratura, Método da indentação
Como citar
Journal Of Applied Oral Science : Revista Fob, v. 11, n. 1, p. 69-75, 2003.