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research-article

Evaluation of wear resistance of dental chairside CAD/CAM glass ceramics reinforced by different crystalline phases

[+] Author and Article Information
Qianqian Zhang

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
zhangqianqian8729@163.com

Shanshan Gao

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
yhyang6812@scu.edu.cn

Chunxu Liu

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
534328906@qq.com

Yuqing Lu

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
lyqhxkq@163.com

Xin Chen

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
920057818@qq.com

Haiyang Yu

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
18215614621@163.com

1Corresponding author.

ASME doi:10.1115/1.4041536 History: Received April 18, 2018; Revised September 16, 2018

Abstract

The mechanical properties of crystalline phase of glass ceramics are critical. This study aimed to evaluate wear resistance of different crystalline reinforced dental chairside CAD/CAM glass ceramics. Materials of feldspar (Vita Mark II, VM), leucite (IPS Empress CAD, EC), lithium disilicate (IPS e.max CAD, EX), lithium silicate enriched with zirconia (Vita Suprinity, VS) and enamel were embedded, grounded and polished, respectively. Samples were indented with a Vickers hardness tester to test the fracture resistance (KIC). Two-body wear tests were performed in a reciprocal ball-on-flat configuration under artificial saliva. The parameters of load force (50N), reciprocating amplitude (500µm), frequency (2Hz) and the test cycle (10000 cycles) were selected. Specimen microstructure, indentation morphology and wear scars were observed by scanning electron microscope (SEM), optical microscopy (OM) and 3-D profile microscopy. EX, VS and EC demonstrated significantly higher KIC values than the enamel, while ceramic materials showed smaller wear depth results. Cracks, massive delamination and shallow plough were seen on the enamel worn scar. Long deep plough, delamination and brittle cracks are more common for VM and EC, and short shallow plough and smooth subsurface are the characteristics of EX and VS. Greater fracture toughness values indicated higher wear resistances of the materials for the test glass ceramics. The CAD/CAM glass ceramics performed greater wear resistance than enamel. Feldspar and leucite reinforced glass ceramics illustrated better wear resistance similar to enamel than lithium disilicate glass ceramics, providing amicable matching with the opposite teeth.

Copyright (c) 2018 by ASME
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