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The effect of glass fiber-reinforced epoxy resin dowel diameter on the fracture resistance of endodontically treated teeth.
J Prosthodont. 2014 Oct; 23(7):572-81.JP

Abstract

PURPOSE

To determine the effect of glass fiber-reinforced epoxy resin (FRC) dowels of different diameters on the failure load of endodontically treated teeth with different remaining dentine and reinforcing resin composite (RRC) thicknesses and the mode of failure in each group.

MATERIALS AND METHODS

Fifty extracted intact human maxillary central incisors were decoronated 2 mm incisal to the buccal cementoenamel junction and endodontically treated. The teeth were randomly assigned to one of five groups (n = 10): group B, dowel space prepared with size 0 dowel drill/size 0 FRC dowel/no RRC; group W, size 1 dowel space/size 1 FRC dowel/no RRC; group R, size 3 dowel space/size 3 FRC dowel/no RRC; group WR, size 3 dowel space/size 1 FRC dowel/RRC; group BR, size 3 dowel space/size 0 FRC dowel/RRC. Ferrules of 2 and 0.5 mm were prepared at the facio-lingual and proximal margin respectively. All specimens were restored with a Ni-Cr crown, thermocycled and loaded at 135° from the long axis in a universal testing machine at a 0.5 mm/min crosshead speed until fracture. Data were analyzed using ANOVA followed by post hoc comparisons (Bonferroni) with α = 0.05.

RESULTS

Mean failure loads (N) for groups B, W, R, WR, and BR were as follows: 1406 (SD = 376), 1259 (379), 1085 (528), 959 (200), and 816 (298). Significant differences were found between groups B and BR. Group B had the highest favorable failure mode.

CONCLUSION

Within the limitations of this study, the use of a smaller FRC dowel and RRC is recommended rather than enlargement of dowel spaces to accurately fit larger FRC dowels, as the enlargement of dowel space may increase the risk of unfavorable failure.

Authors+Show Affiliations

Department of Conservative Dentistry, University of Malaya, Kuala Lumpur, Malaysia.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

24750324

Citation

Tey, Kuan Chuan, and Joo Loon Lui. "The Effect of Glass Fiber-reinforced Epoxy Resin Dowel Diameter On the Fracture Resistance of Endodontically Treated Teeth." Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, vol. 23, no. 7, 2014, pp. 572-81.
Tey KC, Lui JL. The effect of glass fiber-reinforced epoxy resin dowel diameter on the fracture resistance of endodontically treated teeth. J Prosthodont. 2014;23(7):572-81.
Tey, K. C., & Lui, J. L. (2014). The effect of glass fiber-reinforced epoxy resin dowel diameter on the fracture resistance of endodontically treated teeth. Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, 23(7), 572-81. https://doi.org/10.1111/jopr.12146
Tey KC, Lui JL. The Effect of Glass Fiber-reinforced Epoxy Resin Dowel Diameter On the Fracture Resistance of Endodontically Treated Teeth. J Prosthodont. 2014;23(7):572-81. PubMed PMID: 24750324.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effect of glass fiber-reinforced epoxy resin dowel diameter on the fracture resistance of endodontically treated teeth. AU - Tey,Kuan Chuan, AU - Lui,Joo Loon, Y1 - 2014/04/18/ PY - 2013/09/24/accepted PY - 2014/4/23/entrez PY - 2014/4/23/pubmed PY - 2016/9/14/medline KW - Glass fiber dowel KW - diameter KW - dowel and core KW - endodontically treated teeth KW - fracture resistance KW - reinforcing resin composite SP - 572 EP - 81 JF - Journal of prosthodontics : official journal of the American College of Prosthodontists JO - J Prosthodont VL - 23 IS - 7 N2 - PURPOSE: To determine the effect of glass fiber-reinforced epoxy resin (FRC) dowels of different diameters on the failure load of endodontically treated teeth with different remaining dentine and reinforcing resin composite (RRC) thicknesses and the mode of failure in each group. MATERIALS AND METHODS: Fifty extracted intact human maxillary central incisors were decoronated 2 mm incisal to the buccal cementoenamel junction and endodontically treated. The teeth were randomly assigned to one of five groups (n = 10): group B, dowel space prepared with size 0 dowel drill/size 0 FRC dowel/no RRC; group W, size 1 dowel space/size 1 FRC dowel/no RRC; group R, size 3 dowel space/size 3 FRC dowel/no RRC; group WR, size 3 dowel space/size 1 FRC dowel/RRC; group BR, size 3 dowel space/size 0 FRC dowel/RRC. Ferrules of 2 and 0.5 mm were prepared at the facio-lingual and proximal margin respectively. All specimens were restored with a Ni-Cr crown, thermocycled and loaded at 135° from the long axis in a universal testing machine at a 0.5 mm/min crosshead speed until fracture. Data were analyzed using ANOVA followed by post hoc comparisons (Bonferroni) with α = 0.05. RESULTS: Mean failure loads (N) for groups B, W, R, WR, and BR were as follows: 1406 (SD = 376), 1259 (379), 1085 (528), 959 (200), and 816 (298). Significant differences were found between groups B and BR. Group B had the highest favorable failure mode. CONCLUSION: Within the limitations of this study, the use of a smaller FRC dowel and RRC is recommended rather than enlargement of dowel spaces to accurately fit larger FRC dowels, as the enlargement of dowel space may increase the risk of unfavorable failure. SN - 1532-849X UR - https://www.unboundmedicine.com/medline/citation/24750324/The_effect_of_glass_fiber_reinforced_epoxy_resin_dowel_diameter_on_the_fracture_resistance_of_endodontically_treated_teeth_ L2 - https://doi.org/10.1111/jopr.12146 DB - PRIME DP - Unbound Medicine ER -