Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

Thiago Soares Porto; Renato Cassio Roperto; Sorin Theodor Teich; Fady Fouad Faddoul; Fabio Antonio Piolla Rizzante; Sizenando de Toledo Porto-Neto; Edson Alves de Campos

doi:10.1590/1807-3107bor-2019.vol33.0026

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Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

Journal article

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Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

Thiago Soares Porto, Renato Cassio Roperto, Sorin Theodor Teich, Fady Fouad Faddoul, Fabio Antonio Piolla Rizzante, Sizenando de Toledo Porto-Neto and Edson Alves de Campos

Brazilian oral research, Vol.33(1), pp.e026-e026

01/01/2019

DOI: 10.1590/1807-3107bor-2019.vol33.0026

PMID: 30970090

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Abstract

The aim of this study is to evaluate the machinability of four CAD/CAM materials (n = 13) assessed by brittleness index, Vickers hardness, and fracture toughness and interaction among such mechanical properties. The materials selected in this in vitro study are Feldspathic ceramic [FC], Lithium-disilicate glass ceramic [LD], leucite-reinforced glass ceramic [LR], and nanofilled resin material [RN]. Slices were made from the blocks following original dimensions 14 × 12 × 3 mm (L × W × H), using a precision slow-speed saw device and then surfaces were regularized through a polishing device. Brittleness index and fracture toughness were calculated by the use of specific equations for each one of the properties. The Vickers hardness was calculated automated software in the microhardness device. One-way Anova and Pearson's correlation were applied to data evaluation. LD obtained the highest values for brittleness index and was not significantly different from FC. LR presented statistically significant difference compared with RN, which had the lowest mean. Vickers hardness showed LD with the highest average, and no statistical difference was found between FC and LR. RN presented the lowest average. Fracture toughness showed FC and LR not statistically different from each other, likewise LD and RN. The brittleness index, considered also as the machinability of a material, showed within this study as positively dependent on Vickers hardness, which leads to conclusion that hardness of ceramics is related to its milling capacity. In addition, fracture toughness of pre-sintered ceramics is compared to polymer-based materials.

Materials Testing

Aluminum Silicates - chemistry

Analysis of Variance

Ceramics - chemistry

Computer-Aided Design

Dental Porcelain - chemistry

Hardness Tests

Polymers - chemistry

Reference Values

Reproducibility of Results

Resin Cements - chemistry

Statistics, Nonparametric

Surface Properties

Details

Title: Subtitle: Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials
Creators: Thiago Soares Porto - Case Western Reserve University
Renato Cassio Roperto - Case Western Reserve University
Sorin Theodor Teich - Medical University of South Carolina
Fady Fouad Faddoul - Case Western Reserve University
Fabio Antonio Piolla Rizzante - Case Western Reserve University
Sizenando de Toledo Porto-Neto - Universidade Estadual Paulista (Unesp)
Edson Alves de Campos - Universidade Estadual Paulista (Unesp)
Resource Type: Journal article
Publication Details: Brazilian oral research, Vol.33(1), pp.e026-e026
DOI: 10.1590/1807-3107bor-2019.vol33.0026
PMID: 30970090
NLM abbreviation: Braz Oral Res
ISSN: 1806-8324
eISSN: 1807-3107
Language: English
Date published: 01/01/2019
Academic Unit: Operative Dentistry
Record Identifier: 9984420843102771

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