Effects of dental tissue substructure and size on fracture strengths of lithium disilicate and zirconia ceramics

Xin Luo; Ting Zhang; Xing Shen; Haifeng Wang; Jianfu Qi; Peifeng Zhou

doi:10.14393/BJ-v40n0a2024-68127

Authors

Xin Luo The Third People's Hospital of Yuhang District
Ting Zhang Fudan University
Xing Shen The Third People's Hospital of Yuhang District
Haifeng Wang Zhuji Affiliated Hospital of Wenzhou Medical University
Jianfu Qi Zhuji Affiliated Hospital of Wenzhou Medical University
Peifeng Zhou Zhuji Affiliated Hospital of Wenzhou Medical University

DOI:

https://doi.org/10.14393/BJ-v40n0a2024-68127

Keywords:

Ceramics, Fracture strength, Glass, Lithium, Tooth tissue.

Abstract

We aimed to assess the effects of standard resin preparation models with five different thicknesses of occlusal surface on the fracture strengths of zirconia (ZrO2) and lithium disilicate glass ceramics. The specimens of 10 first maxillary molars collected between January 2019 and January 2020 were selected. Standard mathematical models were formed after scanning the resin matrices using software. The full crowns with five different thicknesses of occlusal surface were established, among which the molar specimens prepared by ZrO2 glass ceramic composites alone were assigned into ZrO2 group (n=5, 40 specimens) while those prepared using ZrO2-lithium disilicate glass ceramic composites were allocated into ZTCLDC group (n=5, 40 specimens). When the thickness of glass-ceramic full crowns was 0.5, 0.8, 1.0, 1.2 and 1.5 mm, the fracture load of the specimens in ZTCLDC group was not significantly different from that in ZrO2 group, and there was no significant difference in the three-point flexural strength between ZTCLDC group and ZrO2 group (P>0.05). The fracture toughness was not significantly different between the two groups in the case of the thickness of glass-ceramic full crown at 0.5, 0.8, 1.0, 1.2 and 1.5 mm (P>0.05). The thickness was positively correlated with fracture load, three-point flexural strength and fracture toughness (P<0.05). The fracture strength of lithium disilicate and ZrO₂ ceramics is directly proportional to the thickness of ZrO₂ and ZTCLDC crowns.

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