Experimental and numerical fatigue investigations of CAD/CAM ceramic crowns under dynamic loads

Informatics in Medicine Unlocked

Mohammad Al janaideh¹  Khaled Bataineh² 

[1] Department of Mechanical Engineering, Jordan University of Science and Technology, Irbid, Jordan;Corresponding author. Jordan University of Science and Technology, P O Box 3030, Irbid, 22110, Jordan.;

关键词: CAD/CAM ceramics;    Dental crowns;    Fatigue;    Finite element method;    Lithium disilicate;    Polymer infiltrated ceramics;   

DOI  :  

来源: DOAJ

【 摘 要 】

The purpose of this study was to estimate the fatigue life of nine new CAD/CAM ceramic materials used for the first molar restoration. This study provides a direct method for translating the laboratory fatigue data into information that can be used to predict clinical failure. Both numerical and experimental investigations were carried out to estimate the fatigue lives of restorative materials. A three-dimensional (3D) model of the first molar restored crown was constructed from the CT scan. The generated 3D solid model was transferred into commercial finite element software ANSYS 18.1 for the execution of finite element analysis (FEA). The fatigue life of nine restorative materials was estimated by the finite element method. The materials are: polycrystalline zirconia (high translucent tetragonal zirconia polycrystals doped by yttrium YZ-HT zirconia), IPS e.max ZirCAD sintered at 1450 °C, IPS e.max ZirCAD sintered at 1650 °C, IPS e.max ZirCAD sintered at 1530 °C 3Y-TZP (ZENO Zr (ZW) as received), 3Y-TZP (ZENO Zr (ZW) sandblasted); lithium disilicate (LD), and polymer infiltrated ceramic (PIC). Two types of loads were used to simulate the occlusal load: axial and oblique loads. Experimental results show that all the samples fractured at the same location, which is slightly off the symmetry fissure plane between cusps. The predicted lifetimes were longer than 10 years for the monolithic crowns made of all materials studied except for the crown made of PIC which failed in less than a week under 100 N force. Sandblasting improved the long-term fatigue resistance. 3Y-TZP sintered at 1450 °C has better fatigue resistance at the beginning and drops significantly compared to the 3Y-TZP sintered at 1650 °C. Crowns made of 3Y-TZP (sintered at 1530 °C) have superior fatigue resistance compared to other ceramic CAD/CAM materials. Finally, it was found that materials with distinct compositions, distinct treatments, and distinct post-processing have different initial fatigue strengths, and their reduction in strength when subjected to cyclic load varies significantly.

【 授权许可】

Unknown