J Adv Prosthodont.  2014 Jun;6(3):200-206. 10.4047/jap.2014.6.3.200.

Fracture resistance of endodontically treated maxillary premolars restored by silorane-based composite with or without fiber or nano-ionomer

• Shafiei F
• Tavangar M
• Ghahramani Y
• Fattah Z

• KMID: 2118231
• DOI: http://doi.org/10.4047/jap.2014.6.3.200

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 (alpha=0.05).
RESULTS
Mean fracture resistance for the eight groups (in Newton) were G1: 1200 +/- 169a, G2: 360 +/- 93b, G3: 632 +/- 196c, G4: 692 +/- 195c, G5: 917 +/- 159d, G6: 1013 +/- 125ad, G7: 959 +/- 148d, G8: 947 +/- 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

MeSH Terms

Aging
Bicuspid*
Dental Pulp Cavity
Polyethylene
Prevalence
Silorane Resins
Tooth
Polyethylene
Silorane Resins

Figure

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  Fig. 1 Descriptive diagram of the eight groups.

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  Fig. 2 Mode of restorable fracture.

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  Fig. 3 Mode of unrestorable fracture.

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