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Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems.
J Prosthet Dent. 2005 Jan; 93(1):45-50.JP

Abstract

STATEMENT OF PROBLEM

The successful restoration of endodontically treated teeth is enhanced by a crown design employing the ferrule effect. However, it is unclear which dowel-and-core system most effectively supports successful treatment.

PURPOSE

The purpose of this study was to compare the load fatigue resistance of 3 dowel-and-core systems.

MATERIAL AND METHODS

Fifteen endodontically treated maxillary central incisors were sectioned perpendicular to the long axis at a point 1.5 mm incisal to the cemento-enamel junction (CEJ). At the level of the CEJ, specimens were then prepared for crowns with 1-mm complete shoulder finish lines and 1.5 mm of axial wall height. The prepared teeth were divided into 3 groups (n=5) and restored with 1 of the following dowel-and-core combinations: Group CG, cast gold dowels and cores; Group TA, titanium alloy dowels (ParaPost XH) with composite cores; or Group FR, fiber-reinforced resin dowels (ParaPost FiberWhite) with composite cores. A dentin bonding agent (OptiBond Solo) was placed prior to the composite cores. Dowel-and-core castings and titanium alloy dowels were cemented with zinc phosphate cement. The fiber-reinforced dowels were cemented with a resin cement (ParaPost Cement). The crowns for all specimens were cast with an incisal notch for applying the fatigue load. The independent variable measured was the number of load fatigue cycles required to cause luting cement failure. The data were subjected to 1-way analysis of variance and the Student-Newman-Keuls test for 3 subsets (alpha=.05).

RESULTS

The mean value+/-standard deviation for the cycles to failure for each group was: Group CG: 11,897+/-4080 load cycles, Group TA: 24,384+/-8231 load cycles, and Group FR: 50,696+/-7063 load cycles. Significant differences were found between all groups (P<.05).

CONCLUSIONS

Fiber-reinforced resin dowels and bonded composite cores under fatigue loading provided significantly stronger crown retention than cast gold dowels and cores and titanium alloy dowels with composite cores under fatigue loading.

Authors+Show Affiliations

University of Washington, Seattle, WA, USA. ygoto@usc.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

15623997

Citation

Goto, Yoshihiro, et al. "Fatigue Resistance of Endodontically Treated Teeth Restored With Three Dowel-and-core Systems." The Journal of Prosthetic Dentistry, vol. 93, no. 1, 2005, pp. 45-50.
Goto Y, Nicholls JI, Phillips KM, et al. Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems. J Prosthet Dent. 2005;93(1):45-50.
Goto, Y., Nicholls, J. I., Phillips, K. M., & Junge, T. (2005). Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems. The Journal of Prosthetic Dentistry, 93(1), 45-50.
Goto Y, et al. Fatigue Resistance of Endodontically Treated Teeth Restored With Three Dowel-and-core Systems. J Prosthet Dent. 2005;93(1):45-50. PubMed PMID: 15623997.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems. AU - Goto,Yoshihiro, AU - Nicholls,Jack I, AU - Phillips,Keith M, AU - Junge,Thomas, PY - 2004/12/30/pubmed PY - 2005/4/1/medline PY - 2004/12/30/entrez SP - 45 EP - 50 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 93 IS - 1 N2 - STATEMENT OF PROBLEM: The successful restoration of endodontically treated teeth is enhanced by a crown design employing the ferrule effect. However, it is unclear which dowel-and-core system most effectively supports successful treatment. PURPOSE: The purpose of this study was to compare the load fatigue resistance of 3 dowel-and-core systems. MATERIAL AND METHODS: Fifteen endodontically treated maxillary central incisors were sectioned perpendicular to the long axis at a point 1.5 mm incisal to the cemento-enamel junction (CEJ). At the level of the CEJ, specimens were then prepared for crowns with 1-mm complete shoulder finish lines and 1.5 mm of axial wall height. The prepared teeth were divided into 3 groups (n=5) and restored with 1 of the following dowel-and-core combinations: Group CG, cast gold dowels and cores; Group TA, titanium alloy dowels (ParaPost XH) with composite cores; or Group FR, fiber-reinforced resin dowels (ParaPost FiberWhite) with composite cores. A dentin bonding agent (OptiBond Solo) was placed prior to the composite cores. Dowel-and-core castings and titanium alloy dowels were cemented with zinc phosphate cement. The fiber-reinforced dowels were cemented with a resin cement (ParaPost Cement). The crowns for all specimens were cast with an incisal notch for applying the fatigue load. The independent variable measured was the number of load fatigue cycles required to cause luting cement failure. The data were subjected to 1-way analysis of variance and the Student-Newman-Keuls test for 3 subsets (alpha=.05). RESULTS: The mean value+/-standard deviation for the cycles to failure for each group was: Group CG: 11,897+/-4080 load cycles, Group TA: 24,384+/-8231 load cycles, and Group FR: 50,696+/-7063 load cycles. Significant differences were found between all groups (P<.05). CONCLUSIONS: Fiber-reinforced resin dowels and bonded composite cores under fatigue loading provided significantly stronger crown retention than cast gold dowels and cores and titanium alloy dowels with composite cores under fatigue loading. SN - 0022-3913 UR - https://www.unboundmedicine.com/medline/citation/15623997/Fatigue_resistance_of_endodontically_treated_teeth_restored_with_three_dowel_and_core_systems_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022391304006262 DB - PRIME DP - Unbound Medicine ER -