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Type: Artigo de periódico
Title: Ultimate Tensile Strength Of Tooth Structures.
Author: Giannini, Marcelo
Soares, Carlos José
de Carvalho, Ricardo Marins
Abstract: This study determined the ultimate tensile strength (UTS) of enamel (E), dentin (D) and dentin-enamel junction (DEJ) using the microtensile technique. It was hypothesized that the UTS of dental structures varies according to location and nature. Intact occlusal enamel surfaces from extracted human third molars were etched with 37% phosphoric acid and bonded with a one-bottle adhesive system. The bonded occlusal surfaces received a resin composite build-up and teeth were serially, vertically sectioned into several 0.7 mm thick slabs. Each slab was then trimmed to a dumbbell-shaped specimen with irrigated diamond burs to reduce the cross-sectional area to approximately 0.5 mm2 at E, D or DEJ. E was tested according to its prismatic orientation (parallel, EP; and transversally, ET) and D as function of depth (superficial, DS; middle, DM and deep, DD). Specimens were tested in tension in an Instron testing machine at 0.5 mm/min. Results were analyzed by one-way ANOVA and Duncan's Multiple Range test. UTS mean values (N = 20) were, MPa (SD): DEJ, 46.9 (13.7)b; EP, 42.1 (11.9)b; ET, 11.5 (4.7)d; DS, 61.6 (16.2)a; DM, 48.7 (16.6)b and DD, 33.9 (7.9)c. Enamel stressed transversally to its prismatic orientation was significantly weaker (p < 0.05) Dentin depth significantly affected its UTS (p < 0.05) DEJ presented UTS that was similar to EP and DM (p > 0.05) The UTS of dental structures varies according to its nature and location.
Subject: Analysis Of Variance
Dental Enamel
Dental Stress Analysis
Materials Testing
Microscopy, Electron, Scanning
Statistics, Nonparametric
Tensile Strength
Tooth Cervix
Citation: Dental Materials : Official Publication Of The Academy Of Dental Materials. v. 20, n. 4, p. 322-9, 2004-May.
Rights: fechado
Identifier DOI: 10.1016/S0109-5641(03)00110-6
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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