Fracture resistance of thin-walled teeth restored with different post and core materials

Abstract

Abstract: PURPOSE: To discuss the selection of appropriate post and core materials in order to obtain better fracture resistance for thin-walled teeth. METHODS: Ninety maxillary incisors were endodontically treated and the crowns were cut off. Then they were randomly divided into 9 groups. The teeth in the first 4 groups were restored with cast (A1.3 and A1.6) and fiber (B1.3 and B1.6) posts of 1.3 and 1.7mm diameters. The teeth in the other 5 groups were enlarged to simulate the 1 mm thin-walled teeth and restored with cast (C) and fiber posts. The fiber posts were reconstructed and cemented with Unicem (D1.3 and D1.6) and ParaCore (E1.3 and E1.6). All teeth were restored with full crown, and the fracture resistance and fracture mode were analysed. Statistical analysis was carried out using SPSS 16.0 software package. RESULTS: Largest fracture resistance values (610.2±45.6) N were found in Group A1.3 of ordinary root canals, and no significant difference (P>0.05) existed between Group A1.3, A1.6 and B1.3, B1.6. Group C received the largest fracture resistance value(584.5±121.2) N in thin-walled root canals, and fiber posts reconstructed with ParaCore cement could increase fracture resistance [E1.3,(420.6±95.7) N; E1.6,(517.9±67.2) N], which was significant different compared with D1.3 and D1.6 (P<0.05), but similar to B1.3 and B1.6 in ordinary root canals. CONCLUSIONS: The root can be better preserved by fiber post and the fracture resistance is not affected by the posts with diameters of 1.3 mm and 1.6 mm. The fracture resistance of teeth can be enhanced by reconstruction of root canals with Paracore.

Key words: Thin-walled root canal, Fracture resistance, Glass fiber post, Fracture mode

CLC Number:

R783.1

ZHOU Wen-mei, HUANG Guo-wei. Fracture resistance of thin-walled teeth restored with different post and core materials[J]. Shanghai Journal of Stomatology, 2014, 23(3): 312-316.

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