Degradação da interface de união utilizando diferentes sistemas adesivos em dentes deciduos e permanentes tratados endodonticamente : estudo in vitro / Bonding degradation in endodontic treated permanent and primary teeth using different adhesive systems : an in vitro study

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

During the endodontic treatment irrigant substances with the purpose of assisting the disinfection of the ducts are used, being the most used the sodium hypochlorite. These substances modify the teeth substrata, which is used in the formation of the hybrid layer and bonding of the adhesive systems to the dentine. The studies are controversial of the shear bond strength in cavities previously treated with irrigants substances used in endodontic treatment Objective: To evaluate, by microtensile bond strength (µTBS) and the resin/dentin interface morphology, the 90-day-bonding degradation of primary and permanent dentin after simulating the irrigation procedure during endodontics, using different adhesive systems. Methods: Ninety sound third molars and ninety sound primary molars were divided into eighteen permanent and eighteen primary dentin groups, according to: adhesive systems (Adper Single Bond 2-SB, Clearfil Protect Bond-CP, Adper Prompt L-Pop-APL); dentin treatment (with or no 0.5% NaOCl irrigation) and storage time (24h, 45 days, 90 days). The middle dentin was exposed; NaOCl irrigation was accomplished according to the group, and restored with composite (Charisma-Shade-A3.5). Sticks with 1mm2 section area were obtained and submitted to µTBS test and obtained data were submitted to ANOVA and Tukey tests (p<0.05). The failure mode, resin tags presence and the resin/dentin interface were evaluated by Scanning Electron Microscopy (SEM) and obtained data were submitted to Chi-square test (p<0.05). Results: For primary dentin, APL showed the lowest µTBS values, regardless irrigation and storage time. For permanent dentin, µTBS values of APL decreased when NaOCl was used, and CP and SB showed similar values. There was significant decrease in µTBS at 90-day storage when primary and permanent dentin was not irrigated with NaOCl, however until 45-day storage did not affect µTBS values. The often failure mode was the mixed for both permanent and primary dentin. At 90-day storage, the resin tags presence generally decreased, except for SB in primary dentin that it remains almost 100%. Conclusions: concerning permanent and primary teeth, NaOCl irrigation did not affect the bonding strength after 90-day storage, except when APL was used in permanent dentin; in addition, for primary teeth the most important factor in adhesion is the adhesive system used, while for permanent teeth the interaction between adhesive system and NaOCl irrigation is significant.

ASSUNTO(S)

dentina dentin sodium hypochlorite endodontia endodontics hipoclorito de sodio

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