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Effect of CAD/CAM glass fiber post-core on cement micromorphology and fracture resistance of endodontically treated roots.
Am J Dent. 2017 02; 30(1):3-8.AJ

Abstract

PURPOSE

To investigate the fracture resistance of weakened roots restored with prefabricated or CAD/CAM-customized posts and cores as well as the thickness of the cement film and the presence of voids in the cement.

METHODS

The roots of 40 human premolars were weakened by removing internal dentin with a diamond bur (2.5 mm in the coronal third and 1.5 mm in the apical third) and restored with prefabricated posts (PPs) or customized posts (CPs) with or without a zirconia crown (n= 10). Posts and crowns were cemented with resin cement. Microtomography was used to determine the thickness of the cement film and whether voids were present. After fatigue testing (1 million cycles, 50 N, 5 Hz, 36.5°C), the specimens underwent compression testing with an oblique load (30°, 1 mm/minute) and fracture strengths were recorded (N). Fracture strength and film thickness were analyzed with ANOVA and the Games-Howell test; the variable presence of voids was analyzed with the Mann-Whitney test (α= 5%).

RESULTS

Mean fracture strengths varied between 640.4 and 792.9 N and did not differ significantly between groups. The CP group had a thinner cement film and fewer voids than the PP group. There was a positive, statistically significant correlation (Spearman, R=0.488, P= 0.029) between these variables.

CLINICAL SIGNIFICANCE

CAD/CAM-manufactured glass-fiber posts and cores do not affect the fracture strength of flared root canals or cause catastrophic failure of the root when used with zirconia crowns.

Authors+Show Affiliations

da Costa RG
Dental Prosthesis, Federal Institute for Science and Technology of Parana, Curitiba, PR, Brazil.
Freire A
Graduate Program in Dentistry, School of Life Sciences, Pontifícia Universidade Católica do Parana, Curitiba, Parana, Brazil.
Caregnatto de Morais EC
Department of Prosthodontics, Federal Institute for Science and Technology of Parana, Curitiba, PR, Brazil.
Machado de Souza E
Graduate Program in Dentistry, School of Life Sciences, Pontifícia Universidade Católica do Parana, Curitiba, Parana, Brazil.
Correr GM
Graduate Program in Clinical Dentistry, University of Positivo, Curitiba, Parana, Brazil.
Rached RN
Graduate Program in Dentistry, School of Life Sciences, Pontifícia Universidade Católica do Parana, Curitiba, Parana, Brazil.

MeSH

Computer-Aided DesignCrownsDental CementsDental MaterialsDental Stress AnalysisGlassHumansIn Vitro TechniquesMolarPost and Core TechniqueRoot Canal TherapyTooth FracturesTooth RootZirconium

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29178707

Citation

da Costa, Rogério Goulart, et al. "Effect of CAD/CAM Glass Fiber Post-core On Cement Micromorphology and Fracture Resistance of Endodontically Treated Roots." American Journal of Dentistry, vol. 30, no. 1, 2017, pp. 3-8.
da Costa RG, Freire A, Caregnatto de Morais EC, et al. Effect of CAD/CAM glass fiber post-core on cement micromorphology and fracture resistance of endodontically treated roots. Am J Dent. 2017;30(1):3-8.
da Costa, R. G., Freire, A., Caregnatto de Morais, E. C., Machado de Souza, E., Correr, G. M., & Rached, R. N. (2017). Effect of CAD/CAM glass fiber post-core on cement micromorphology and fracture resistance of endodontically treated roots. American Journal of Dentistry, 30(1), 3-8.
da Costa RG, et al. Effect of CAD/CAM Glass Fiber Post-core On Cement Micromorphology and Fracture Resistance of Endodontically Treated Roots. Am J Dent. 2017;30(1):3-8. PubMed PMID: 29178707.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of CAD/CAM glass fiber post-core on cement micromorphology and fracture resistance of endodontically treated roots. AU - da Costa,Rogério Goulart, AU - Freire,Andrea, AU - Caregnatto de Morais,Eduardo Christiano, AU - Machado de Souza,Evelise, AU - Correr,Giselle Maria, AU - Rached,Rodrigo Nunes, PY - 2017/11/28/entrez PY - 2017/11/28/pubmed PY - 2018/4/25/medline SP - 3 EP - 8 JF - American journal of dentistry JO - Am J Dent VL - 30 IS - 1 N2 - PURPOSE: To investigate the fracture resistance of weakened roots restored with prefabricated or CAD/CAM-customized posts and cores as well as the thickness of the cement film and the presence of voids in the cement. METHODS: The roots of 40 human premolars were weakened by removing internal dentin with a diamond bur (2.5 mm in the coronal third and 1.5 mm in the apical third) and restored with prefabricated posts (PPs) or customized posts (CPs) with or without a zirconia crown (n= 10). Posts and crowns were cemented with resin cement. Microtomography was used to determine the thickness of the cement film and whether voids were present. After fatigue testing (1 million cycles, 50 N, 5 Hz, 36.5°C), the specimens underwent compression testing with an oblique load (30°, 1 mm/minute) and fracture strengths were recorded (N). Fracture strength and film thickness were analyzed with ANOVA and the Games-Howell test; the variable presence of voids was analyzed with the Mann-Whitney test (α= 5%). RESULTS: Mean fracture strengths varied between 640.4 and 792.9 N and did not differ significantly between groups. The CP group had a thinner cement film and fewer voids than the PP group. There was a positive, statistically significant correlation (Spearman, R=0.488, P= 0.029) between these variables. CLINICAL SIGNIFICANCE: CAD/CAM-manufactured glass-fiber posts and cores do not affect the fracture strength of flared root canals or cause catastrophic failure of the root when used with zirconia crowns. SN - 0894-8275 UR - https://www.unboundmedicine.com/medline/citation/29178707/Effect_of_CAD/CAM_glass_fiber_post_core_on_cement_micromorphology_and_fracture_resistance_of_endodontically_treated_roots_ DB - PRIME DP - Unbound Medicine ER -