Compressive strength of three all-ceramic chairside CAD/CAM onlays

doi:10.3969/j.issn.2095-4344.0747

Abstract

Abstract:

BACKGROUND: The use of chairside computer aided design/computer aided manufacture (CAD/CAM) system is a convenient way to fabricate porcelain onlays that have been widely used in clinical practice. Different chairside CAD/CAM all-ceramic materials have different physical and chemical properties, which make a certain difficulty in clinical selection. There are few studies on compressive strength of chairside CAD/CAM porcelain onlays at home and abroad.

OBJECTIVE: To investigate the fracture strength of onlay restorations with different chairside CAD/CAM all-ceramic materials.

METHODS: Thirty onlay specimens of isolated teeth were prepared in the study. These specimens were randomly divided into three groups: CEREC Blocs group, IPS e.max CAD group and Lava Ultimate group. In each group, 10 specimens were randomized into two subgroups: bonding group (dual-curing resin adhesive) and unbonded group. Afterwards, these specimens were subjected to vertical compressive loading; the maximum force at fracture and patterns of failure were recorded.

RESULTS AND CONCLUSION: (1) In these groups, the maximum fracture strength was (313.22±56.00) MPa for IPS e.max CAD bonding group; the minimum fracture strength was (15.85±5.20) MPa for CEREC Blocs unbonded group. The fracture strength of IPS e.max CAD was higher than that of the other five groups (P < 0.05). The fracture strength of the bonding group was greater than that of the unbonded group (P < 0.05). There was no significant difference in the fracture strength of the Lava Ultimate and CEREC Blocs groups. (2) In the unbonded group, only fractured porcelain pieces were detected. In the bonding group, fracture of porcelain pieces was often accompanied by tooth fractures. The tooth fracture rate of the bonding group was greater than that of the unbonded group (P < 0.05). There was no significant difference in the failure mode between all-ceramic materials (P > 0.05). (3) Under the condition of this study, the highest fracture strength was found with the IPS e.max CAD material in the three kinds of CAD/CAM all ceramic materials.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Dental Porcelain, Inlays, Compressive Strength, Tissue Engineering

CLC Number:

R318

Yu Lu-lu, Gu Wei-ping. Compressive strength of three all-ceramic chairside CAD/CAM onlays[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(26): 4128-4132.

Figures/Tables 3

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