FRACTOGRAPHIC ANALYSIS OF LITHIUM DISILICATE CERAMICS AND MONOLITHIC ZIRCONIA CERAMICS

Author:

ZHOU SHANYU1,YOU YUEHUA1,HU CHEN2,SUN TING3,SHAO LONGQUAN2

Affiliation:

1. Department of Stomatology, Affiliated Longhua People’s Hospital, Southern Medical University, Shenzhen, Guangdong 518109, P. R. China

2. Department of Stomatology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, P. R. China

3. The Affiliated Stomatology Hospital, Foshan University, Foshan, Guangdong 528000, P. R. China

Abstract

Objective: To compare the fracture mode of lithium disilicate ceramics and zirconia ceramics through a single-load-to-failure test, and reveal the cause of failure through the fractographic analysis of fracture morphology. Methods: Based on the standardized preparations, 10 IPS e.max disilicate ceramic crowns (IPCs) and 10 monolithic zirconia ceramic crowns (MZCs) were designed and fabricated. All the specimens were placed on a universal material testing machine for a single-load-to-failure test. The fracture load was recorded, and two independent sample [Formula: see text]-tests were performed. Additionally, the type of fracture under a stereo-microscope was observed, and the morphological characteristics of the fracture with a scanning electron microscope (SEM) were investigated. Results: The fracture load of the IPC group was [Formula: see text][Formula: see text]N, and that of the MZC group was [Formula: see text][Formula: see text]N, with a statistically significant difference ([Formula: see text], [Formula: see text]). The fracture types of the IPC group and the MZC group were similar, namely, types II and III. The fracture modes of the two groups were all ceramic layer fracture. Through SEM, the origin of the crack on the occlusal surface could be traced back. The crystal fracture of IPC group had a rock sugar-like pattern, and the crystal distribution of MZC group was uniform. Conclusions: Zirconia ceramics have higher fracture load and a denser crystal structure compared to lithium disilicate. Fractographic analysis method could be a better way to analyze the failure mode of single-layer porcelain materials and reveal the origin of fracture.

Funder

the Science and Technology Innovation Foundation of Longhua District of Shenzhen China

the Science and Technology Planning Project of Shenzhen China

the Medical Scientific Research Foundation of Guangdong Province of China

the National Natural Science Foundation of China

the Clinical Research Program of Nanfang Hospital, Southern Medical University

Key Projects of Science and Technology Innovation Project Fund of Longhua District of Shenzhen China

the Financial Support for the Construction of Medical Key Disciplines of Longhua District of Shenzhen China

Publisher

World Scientific Pub Co Pte Ltd

Subject

Biomedical Engineering

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