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Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots.
Braz Dent J. 2011; 22(3):230-7.BD

Abstract

Restoring flared endodontically treated teeth continues to be a challenge for clinicians. This study evaluated the effect of post types and restorative techniques on the strain, fracture resistance, and fracture mode of incisors with weakened roots. One hundred five endodontically treated bovine incisors roots (15 mm) were divided into 7 groups (n=15). The two control groups were (C) intact roots restored with Cpc (cast posts and core) or Gfp (glass fiber posts). The five experimental groups were (F) flared roots restored with GfpAp (Gfp associated with accessory glass fiber posts), GfpRc (anatomic Gfp, relined with composite resin), and GfpRcAp (anatomized Gfp with resin and accessory glass fiber posts). All teeth were restored with metal crowns. Mechanical fatigue was performed with 3x10(5)/50 N. Specimens were loaded at 45º, and the strain values (μS) were obtained on root buccal and proximal surfaces. Following that, the fracture resistance (N) was measured. One-way ANOVA and Tukey's HSD tests (α=0.05) were applied, and failure mode was checked. No significant difference in strain values among the groups was found. Cpc presented lower fracture resistance and more catastrophic failures in flared roots. Gfp associated with composite resin or accessory glass fiber posts seems to be an effective method to improve the biomechanical behavior of flared roots.

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Authors+Show Affiliations

Silva GR
Biomechanical Research Group, Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, MG, Brazil.
Santos-Filho PC
No affiliation info available
Simamoto-Júnior PC
No affiliation info available
Martins LR
No affiliation info available
Mota AS
No affiliation info available
Soares CJ
No affiliation info available

MeSH

AnimalsBiomechanical PhenomenaCattleChromium AlloysComposite ResinsCrownsDental MaterialsDental Prosthesis DesignDental Pulp CavityDental Restoration FailureDental Stress AnalysisDentinDentin-Bonding AgentsEpoxy ResinsGlassIncisorPost and Core TechniqueRandom AllocationResin CementsRoot Canal PreparationSilanesStress, MechanicalTooth FracturesTooth RootTooth, Nonvital

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21915521

Citation

Silva, Gisele Rodrigues da, et al. "Effect of Post Type and Restorative Techniques On the Strain and Fracture Resistance of Flared Incisor Roots." Brazilian Dental Journal, vol. 22, no. 3, 2011, pp. 230-7.
Silva GR, Santos-Filho PC, Simamoto-Júnior PC, et al. Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots. Braz Dent J. 2011;22(3):230-7.
Silva, G. R., Santos-Filho, P. C., Simamoto-Júnior, P. C., Martins, L. R., Mota, A. S., & Soares, C. J. (2011). Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots. Brazilian Dental Journal, 22(3), 230-7.
Silva GR, et al. Effect of Post Type and Restorative Techniques On the Strain and Fracture Resistance of Flared Incisor Roots. Braz Dent J. 2011;22(3):230-7. PubMed PMID: 21915521.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots. AU - Silva,Gisele Rodrigues da, AU - Santos-Filho,Paulo César de Freitas, AU - Simamoto-Júnior,Paulo Cézar, AU - Martins,Luis Roberto Marcondes, AU - Mota,Adérito Soares da, AU - Soares,Carlos José, PY - 2011/9/15/entrez PY - 2011/9/15/pubmed PY - 2012/1/27/medline SP - 230 EP - 7 JF - Brazilian dental journal JO - Braz Dent J VL - 22 IS - 3 N2 - Restoring flared endodontically treated teeth continues to be a challenge for clinicians. This study evaluated the effect of post types and restorative techniques on the strain, fracture resistance, and fracture mode of incisors with weakened roots. One hundred five endodontically treated bovine incisors roots (15 mm) were divided into 7 groups (n=15). The two control groups were (C) intact roots restored with Cpc (cast posts and core) or Gfp (glass fiber posts). The five experimental groups were (F) flared roots restored with GfpAp (Gfp associated with accessory glass fiber posts), GfpRc (anatomic Gfp, relined with composite resin), and GfpRcAp (anatomized Gfp with resin and accessory glass fiber posts). All teeth were restored with metal crowns. Mechanical fatigue was performed with 3x10(5)/50 N. Specimens were loaded at 45º, and the strain values (μS) were obtained on root buccal and proximal surfaces. Following that, the fracture resistance (N) was measured. One-way ANOVA and Tukey's HSD tests (α=0.05) were applied, and failure mode was checked. No significant difference in strain values among the groups was found. Cpc presented lower fracture resistance and more catastrophic failures in flared roots. Gfp associated with composite resin or accessory glass fiber posts seems to be an effective method to improve the biomechanical behavior of flared roots. SN - 1806-4760 UR - https://www.unboundmedicine.com/medline/citation/21915521/Effect_of_post_type_and_restorative_techniques_on_the_strain_and_fracture_resistance_of_flared_incisor_roots_ L2 - https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402011000300009&lng=en&nrm=iso&tlng=en DB - PRIME DP - Unbound Medicine ER -