Effects of different post-core materials with different angles on fracture resistant ability of the maxillary central incisor

doi:10.3969/j.issn.2095-4344.2017.22.011

Abstract

Abstract:

BACKGROUND: In clinical practice, there are some patients with labial inclined anterior teeth which influence their appearance, but they refuse orthodontic treatment because of many factors such as long-term treatment. Alternatively, these patients can receive aesthetics restoration with re-directional post-core and crown.

OBJECTIVE: To investigate the influence of three kinds of post-core materials on fracture resistant ability of labial inclined maxillary central incisor with different changed angles.

METHODS: Seventy-five maxillary central incisors were randomly divided into three groups: group I was restored with Co-Cr post-core and porcelain-fused-to-metal (PFM) crown, group II was restored with 50% gold alloy post-core and PFM crown, group III was restored with everStick fiber post and composite resin core and PFM crowns. Each group then was divided into five subgroups based on angles between the post-core and long axis of the tooth (0°, 10°, 20°, 30°, 40°). All specimens were embedded in acrylic resin and fixed in electronic universal testing machine. Force was loaded to each specimen until fracture occurred, and the maximum load values of fracture and the fracture mode were recorded.

RESULTS AND CONCLUSION: The fracture resistance of group III was superior to groups I and II (P < 0. 05), but there was no significant difference between group I and group II (P > 0.05). The maximum load value of the three groups decreased as the changed angle increased. The fracture of group III mostly appeared on the 1/3 of the root neck, while the fracture of groups I and II mostly appeared on the 1/3 of root central or the 1/3 of the root neck. So, the fracture resistance and fracture mode of central incisor under changed angles restored with everStick fiber post were superior to that with cast metal post-core. During re-directional restoration of labial inclined maxillary anterior teeth, everStick fiber post is recommended as a better choice to reduce the risk of catastrophic fractures. Also it suggests that excessive changed angle should be avoided to prevent root fracture.

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: Incisor, Post and Core Technique, Biomechanics, Tissue Engineering

CLC Number:

R318

Qian Yu-mei, Zhong Qun, Chen Shuang, Tie Si-jiu.

Effects of different post-core materials with different angles on fracture resistant ability of the maxillary central incisor

[J]. Chinese Journal of Tissue Engineering Research, 2017, 21(22): 3507-3512.

Figures/Tables 4

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