An assessment of fracture resistance of endodontically treated maxillary premolars restored with resin composite
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2010-11-03
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Khon Kaen University Dental Journal
Abstract
This study was to compare fracture resistance and fracture pattern of endodontically treated maxillary premolars restored with hybrid, nanofilled and nanohybrid resin composites in MOD cavity preparation. Ninety-six sound maxillary premolar teeth were randomly divided into 4 groups of 24 samples each : the intact teeth, the endodontically treated premolars restored with hybrid, nanofilled and nanohybrid \ resin composite groups respectively. The samples were thermocycled in the condition of 5 ○c and 55 ○c for 500 cycles (60 seconds per cycle). The resistance to fracture, under continuous compressive force at speed of 5 mm/minute, was applied by a universal testing machine until complete fracture. The means of forces in each groups was analyzed using one-way ANOVA and Bonferroni multiple comparisons. The result showed that the fracture resistance of intact group (1348.80 + 332.70 N.) was significantly different from the endodontically treated maxillary premolars restored with hybrid (1015.19+ 250.21 N), nanofilled (1068.13 + 308.9 N.) and nanohybrid (1054.66 + 219.06 N.) resin composite groups (p-value \< 0.001). While the fracture resistance of endodontically treated maxillary premolars restored with 3 resin composites were not statistically significantly different (p-value \> 0.05). The most fracture of all groups occurred at lingual cusp (93 of 96), at the conjunction between dentine and resin composite restoration (65 of 72) and at the same level and below of cementoenamel junction.
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Khon Kaen University Dental Journal; Vo.12 No. 1 Jan - June 2009