A Novel Dentin Push-out Bond Strength Model That Uses Micro-Computed Tomography

Author(s)

Brito-Junior, Manoel ^[1] ; Leoni, Graziela Bianchi ^[2] ; Pereira, Rodrigo Dantas ^[2] ; Faria-e-Silva, Andre Luis ^[3] ; Gomes, Erica Alves ^[4] ; Silva-Sousa, Yara Teresinha ^[4] ; Sousa-Neto, Manoel Damiao ^[2]

Affiliation

^[1] State Univ Montes Claros Unimontes, Dept Dent, Montes Claros, MG - Brazil

^[2] Univ Sao Paulo, Dent Sch Ribeirao Preto, Dept Restorat Dent, BR-14049 Ribeirao Preto - Brazil

^[3] Univ Fed Sergipe, Sch Dent, Dept Dent, Aracaju, Sergipe - Brazil

^[4] Univ Ribeirao Preto UNAERP, Fac Dent, Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF ENDODONTICS; v. 41, n. 12, p. 2058-2063, DEC 2015.
• Web of Science Citations: 5

Abstract

Introduction: Current push-out experimental methods used in endodontic research should be improved. This study introduced a novel dentin push-out bond strength model that uses micro computed tomography (mu CT). Methods: Roots filled with gutta-percha cones and different resin-based sealers (n = 10) were sectioned transversely to obtain two 2-mm-thick slices per root third. The first slice was subjected to a push-out test by using a material testing stage fitted inside a mu CT scanner. The apparatus was scanned before and after the test to evaluate areas of filling material ruptures. The images provided by mu CT were also used to generate models for a 3-dimensional finite element analysis. Confocal laser scanning microscopy was used to assess failure modes after the test and to measure interfacial gaps in slices not subjected to push-out. Bond-strength and gap data were statistically analyzed (P < .05). Results: Proper coefficients of variation (average less than 30%) were observed for all the experimental conditions. The finite element analysis helped explain the results of bond strength and root-filling ruptures. A significant, moderate, indirect correlation was observed between the bond strength and gaps. Conclusions: The micromechanical model with the mu CT images resulted in a consistent root-filling bond strength evaluation. (AU)

• FAPESP's process: 09/09989-0 - Evaluation of biomechanical preparation, root canal obturation, retrofilling cavity, post space preparation, and quality of apical trabecular bone of teeth subjected to different treatment protocols, by means of micro-computed tomography
• Grantee: Manoel Damiao de Sousa Neto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/10151-6 - Evaluation of the adhesivity of the resin sealer to the intraradicular dentin by computed microtomography during the push-out test
• Grantee: Manoel Damiao de Sousa Neto
• Support Opportunities: Regular Research Grants