Mechanical Properties and Precision Analysis of Zirconia Toughened Alumina Crowns Fabricated by Stereolithography Method

doi:10.13701/j.cnki.kqyxyj.2021.06.016

Abstract

Abstract: Objective: To evaluate the mechanical properties and precision of zirconia toughened alumina (ZTA) crowns fabricated by stereolithography (SLA) method. Methods: ZTA specimens (group SL) were made by SLA technology and zirconia specimens (group CM) were made by CAD/CAM milling technology. The flexural strength, Vickers hardness, fracture toughness, and brittleness index were compared. Ten ZTA crowns were made by SLA technology and ten zirconia crowns were made by CAD/CAM milling technology. The precision was evaluated. Results: Although the flexural strength of group SL was lower than that of group CM (P＞0.05), it satisfied the clinical requirement (579.01±43.24) MPa. The Vickers hardness and brittleness index of group SL were higher than group CM, and the fracture toughness of group SL was lower than group CM (P＜0.05). There was no significant difference on the precision between two all-ceramic crown groups in the outer surface (P＞0.05), however, significant difference in the inner surface (P＜0.05). Conclusion: Although in the clinical acceptable range, the mechanical properties and precision of ZTA crowns made by SLA method are still less than those of crowns made by CAD/CAM milling technology. It needs further optimization

Key words: zirconia toughened alumina, stereolithography, CAD/CAM, all-ceramic crown, precision

CHEN Huanhuan, ZHU Li, SONG Yiting, CAI Mengzhe, XU Yidi, HUANG Shengbin, MA Jianfeng. Mechanical Properties and Precision Analysis of Zirconia Toughened Alumina Crowns Fabricated by Stereolithography Method[J]. Journal of Oral Science Research, 2021, 37(6): 554-558.

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