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The effect of post material on the characteristic strength of fatigued endodontically treated teeth.
J Prosthet Dent. 2014 Nov; 112(5):1225-30.JP

Abstract

STATEMENT OF PROBLEM

The biomechanical properties of post systems may become more important as the amount of remaining tooth structure decreases, thus different materials may influence the characteristic strength of fatigued endodontically treated teeth.

PURPOSE

The purpose of this study was to assess the characteristic strength and probability of survival of endodontically treated teeth restored with different intraradicular post systems.

MATERIAL AND METHODS

Forty human maxillary canines with similar root lengths were randomly divided into 4 groups (n=10): cast post and core, stainless-steel prefabricated post, carbon-fiber post, and glass-fiber post. Cores and metallic crowns were fabricated for all specimens. Restored teeth were exposed to mechanical fatigue (250,000 cycles) in a controlled chewing simulator. Each intact specimen was mounted in a special device and aligned at a 45-degree angle to the long axis of the tooth. A universal testing machine was used to apply a static load at a crosshead speed of 0.5 mm/min until specimen failure. The maximum value was recorded in newtons (N). Probability Weibull curves (2-sided 90% confidence bounds) were calculated for each group, and a probability of survival as a function of load at failure was plotted for the groups.

RESULTS

A significantly higher characteristic strength was observed for groups carbon-fiber post (755.82 N) and cast post and core (750.6 N) (P<.05) compared with glass-fiber post (461.35 N) and stainless-steel prefabricated post (524.78 N) groups. All the roots in the cast post and core group demonstrated catastrophic fracture, whereas the remaining groups had no root fractures.

CONCLUSIONS

Prefabricated posts made of glass fiber and stainless steel showed significantly lower characteristic strength and probability of survival than cast post and core, whereas crowns with carbon-fiber posts presented a single load similar to the fracture values of cast posts.

Authors+Show Affiliations

Associate Clinical Professor and Researcher Coordinator, Department of Prosthodontics, Dental School, University of Southern Santa Catarina, Tubarão, Brazil. Electronic address: jeffripe@rocketmail.com.Associated Clinical Professor, Department of Prosthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.Private practice, Itu, São Paulo, Brazil.Associate Clinical Professor and Researcher Coordinator, Department of Prosthodontics, Dental School, University of Southern Santa Catarina, Tubarão, Brazil.Associate Clinical Professor, Department of Prosthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

24836285

Citation

Pereira, Jefferson Ricardo, et al. "The Effect of Post Material On the Characteristic Strength of Fatigued Endodontically Treated Teeth." The Journal of Prosthetic Dentistry, vol. 112, no. 5, 2014, pp. 1225-30.
Pereira JR, do Valle AL, Shiratori FK, et al. The effect of post material on the characteristic strength of fatigued endodontically treated teeth. J Prosthet Dent. 2014;112(5):1225-30.
Pereira, J. R., do Valle, A. L., Shiratori, F. K., Ghizoni, J. S., & Bonfante, E. A. (2014). The effect of post material on the characteristic strength of fatigued endodontically treated teeth. The Journal of Prosthetic Dentistry, 112(5), 1225-30. https://doi.org/10.1016/j.prosdent.2014.03.014
Pereira JR, et al. The Effect of Post Material On the Characteristic Strength of Fatigued Endodontically Treated Teeth. J Prosthet Dent. 2014;112(5):1225-30. PubMed PMID: 24836285.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effect of post material on the characteristic strength of fatigued endodontically treated teeth. AU - Pereira,Jefferson Ricardo, AU - do Valle,Accácio Lins, AU - Shiratori,Fabio Kenji, AU - Ghizoni,Janaina Salomon, AU - Bonfante,Estevam Augusto, Y1 - 2014/05/14/ PY - 2013/08/02/received PY - 2014/03/25/revised PY - 2014/03/26/accepted PY - 2014/5/20/entrez PY - 2014/5/20/pubmed PY - 2016/2/3/medline SP - 1225 EP - 30 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 112 IS - 5 N2 - STATEMENT OF PROBLEM: The biomechanical properties of post systems may become more important as the amount of remaining tooth structure decreases, thus different materials may influence the characteristic strength of fatigued endodontically treated teeth. PURPOSE: The purpose of this study was to assess the characteristic strength and probability of survival of endodontically treated teeth restored with different intraradicular post systems. MATERIAL AND METHODS: Forty human maxillary canines with similar root lengths were randomly divided into 4 groups (n=10): cast post and core, stainless-steel prefabricated post, carbon-fiber post, and glass-fiber post. Cores and metallic crowns were fabricated for all specimens. Restored teeth were exposed to mechanical fatigue (250,000 cycles) in a controlled chewing simulator. Each intact specimen was mounted in a special device and aligned at a 45-degree angle to the long axis of the tooth. A universal testing machine was used to apply a static load at a crosshead speed of 0.5 mm/min until specimen failure. The maximum value was recorded in newtons (N). Probability Weibull curves (2-sided 90% confidence bounds) were calculated for each group, and a probability of survival as a function of load at failure was plotted for the groups. RESULTS: A significantly higher characteristic strength was observed for groups carbon-fiber post (755.82 N) and cast post and core (750.6 N) (P<.05) compared with glass-fiber post (461.35 N) and stainless-steel prefabricated post (524.78 N) groups. All the roots in the cast post and core group demonstrated catastrophic fracture, whereas the remaining groups had no root fractures. CONCLUSIONS: Prefabricated posts made of glass fiber and stainless steel showed significantly lower characteristic strength and probability of survival than cast post and core, whereas crowns with carbon-fiber posts presented a single load similar to the fracture values of cast posts. SN - 1097-6841 UR - https://www.unboundmedicine.com/medline/citation/24836285/The_effect_of_post_material_on_the_characteristic_strength_of_fatigued_endodontically_treated_teeth_ DB - PRIME DP - Unbound Medicine ER -