Fracture resistance ability of severe wedge-shaped premolar defects restored with fiber reinforced composite post by different methods

doi:10.3969/j.issn.2095-4344.2014.25.012

Abstract

Abstract:

BACKGROUND: Previous studies show that the fracture resistant force of endodontically treated teeth can be improved by post. But this idea has been controversial in recent years. Many scholars believe that the root canal preparation might weaken dental root the post increases the risk of tooth fracture.
OBJECTIVE: To evaluate the fracture resistance ability of severe wedge-shaped-defect premolar to oblique loading, which was restored with fiber reinforced composite posts by different therapy methods.
METHODS: A total of 50 human maxillary premolars were randomly divided into five groups, with ten teeth in each group. They were given following treatments: Group A: 10 untreated premolars; Rest 40 premolars of Groups B, C, D and E were prepared 1/3 bucco-lingual distance for artificial severe wedge-shaped defects at the buccal cervix. Group B: untreated severe wedge-shaped defects premolars; Group C: severe wedge-shaped defects premolars were endodontically treated, remaining dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect; Group D: severe wedge-shaped defects premolars were endodontically treated, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect, and then covered with full metal crown; Group E: severe wedge-shaped defects premolars were endodontically treated, removing dentin over
hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, restored with LuxaCore composite resin, and then covered with full metal crown. Fracture resistance of each specimen was measured in each group.
RESULTS AND CONCLUSION: The fracture strength of each group were Group A (1 002.69±147.62) N, Group B (439.28±66.34) N, Group C (958.30±101.23) N, Group D (1 207.09±143.48) N, and Group E (1 056.44±139.30) N. Group D had the highest fracture strength (P < 0.01), while Group B had the lowest fracture strength (P < 0.01). There were no significant difference among the fracture strength of Group A, Group C and Group E. Our findings indicated that the fracture resistance of the severe wedge-shaped defected premolar can be improved by fiber reinforced composite post and dentin above wedge shaped defect remained.

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

全文链接：

Key words: composite resins, bicuspid, root canal therapy

CLC Number:

R318

Shen Qing-yi, Li Guo-qiang, Zhang Qiang, Weng Bei-jun, Weng Jia-wei. Fracture resistance ability of severe wedge-shaped premolar defects restored with fiber reinforced composite post by different methods[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(25): 4004-4008.

Figures/Tables 1

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