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Analyses of cementation and bond strength of two different type of glass fiber post in teeth with simulated internal root resorption

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Author(s):
Ricardo Toledo Abreu
Total Authors: 1
Document type: Master's Dissertation
Press: São José dos Campos. 2019-01-23.
Institution: Universidade Estadual Paulista (Unesp). Instituto de Ciência e Tecnologia. São José dos Campos
Defense date:
Advisor: Cláudio Antonio Talge Carvalho
Abstract

This study analyzed the adhesion interface and bond strength of Rebilda Post (RP) (VOCO) and Rebilda Post GT (GT) (VOCO) glass fibers after cementation in teeth with simulated Internal Root Resorption (IRR). Forty-five roots of lower human premolars were standardized at 16 mm and included in acrylic resin.The root canals (RC) were prepared biomechanically, the roots were sectioned and the IRR was simulated.The segments were returned to original position with the aid of screws. A Ca(OH)2 paste remained as MIC for 15 days.The removal was done by PUI and the quality of the cleaning was evaluated by stereomicroscopy. The RC of the samples were filled and the preparation was done in standardized way. The specimens were divided into 2 groups (n=20), according to the type of cemented post. The bond strength was evaluated at the cervical and RRI levels by the push-out test. For the statistical analysis only adhesive and predominantly adhesive failures were included. The results were submitted to Kruskal-Wallis test, Mann Whitney test and Dunn test (α =.05). SEM was used to analyze the bond interface between cement and dentin root (n=1) and Microcomputed tomography (micro-CT) analysis of the GT post (n=3). PUI was not able to clear completely the majority of RRI (62.5%). There was alteration of the adhesive resistance between all groups (p <.05). The values of bond strength for both groups in the cervical region were higher in relation to the groups in the RRI region.The SEM showed formation of resin tags at the bond interface between resin cement and root dentin for both groups. In micro-CT analysis, the presence of bubbles in the cement and spaces in the bond interface between cement are visible. The adhesion of both posts was affected negatively by the level of cementation, post adaptation in the root canal and presence of IRR. Rebilda Post presented better results of adhesive resistance at the cervical level while that Rebilda Post GT presented better results at RRI level. (AU)

FAPESP's process: 17/14203-1 - Analysis of cementation and bond strength of two different types of glass fiber pins in simulations of internal radial resorptions
Grantee:Ricardo Toledo Abreu
Support Opportunities: Scholarships in Brazil - Master