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KMID : 1023820140060030200
The Journal of Advanced Prosthodontics
2014 Volume.6 No. 3 p.200 ~ p.206
Fracture resistance of endodontically treated maxillary premolars restored by silorane-based composite with or without fiber or nano-ionomer
Fereshteh Shafiei

Maryam Sadat Tavangar
Yasamin Ghahramani
Zahra Fattah
Abstract
PURPOSE : This in vitro study investigated the fracture resistance of endodontically treated premolars restored using silorane- or methacrylate-based composite along with or without fiber or nano-ionomer base.

MATERIALS AND METHODS : Ninety-six intact maxillary premolars were randomly divided into eight groups (n = 12). G1 (negative control) was the intact teeth. In Groups 2-8, root canal treatment with mesio-occlusodistal preparation was performed. G2 (positive control) was kept unrestored. The other groups were restored using composite resin as follows: G3, methacrylate-based composite (Z250); G4, methacrylate composite (Z250) with polyethylene fiber; G5 and G6, silorane-based composite (Filtek P90) without and with the fiber, respectively; G7 and G8, methacrylate- and silorane-based composite with nano-ionomer base, respectively. After aging period and thermocycling for 1000 cycles, fracture strength was tested and fracture patterns were inspected. The results were analyzed using ANOVA and Tukey HSD tests (¥á=0.05).

RESULTS : Mean fracture resistance for the eight groups (in Newton) were G1: 1200 ¡¾ 169a, G2: 360 ¡¾ 93b, G3: 632 ¡¾ 196c, G4: 692 ¡¾ 195c, G5: 917 ¡¾ 159d, G6: 1013 ¡¾ 125ad, G7: 959 ¡¾ 148d, G8: 947 ¡¾ 105d (different superscript letters revealed significant difference among groups). Most of the fractures in all the groups were restorable, except Group 3.

CONCLUSION : Silorane-based composite revealed significantly higher strength of the restored premolars compared to that of methacrylate one. Fiber insertion demonstrated no additional effect on the strength of both composite restorations; however, it increased the prevalence of restorable fracture of methacrylate-based composite restored teeth. Using nano-ionomer base under methacrylate-based composite had a positive effect on fracture resistance and pattern. Only fiber-reinforced silorane composite restoration resulted in a strength similar to that of the intact teeth.
KEYWORD
Endodontically treated premolar, Intracoronal direct restoration, Silorane-based composite, Polyethylene fiber, Nano-ionomer, Fracture resistance
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