ANÁLISE IN VITRO E IN VIVO DE DIFERENTES FORMAS DE APLICAÇÃO DE SISTEMAS ADESIVOS AUTOCONDICIONANTES

• Autor(a) principal: Amaral, Roberto César do
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UEPG
• Texto Completo: http://tede2.uepg.br/jspui/handle/prefix/1744
• topic: adesivo dentinário; tração; dentina; avaliação clínica; dentin adhesive; tensile; dentin; clinical evaluation; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The objective of this study was to evaluate the effect of different modes of application (active vs. inactive) of one step self-etch adhesives under in vitro conditions (resindentin bond strength [BS] and nanoleakage under Scaning Electron Microscopy [SEM]) and in vivo conditions (in non carious class V restorations) in the immediate [IM] and 6 month period [6M]. For the in vitro test, 32 human third molars (20 for BS and 12 for SEM) had their occlusal dentin exposed by wet abrasion with 600-grit SiC paper. The following adhesives Adper Prompt [AP] and Xeno II [XE] were applied under inactive [I] or following vigorous application mode [V] in two coats, which were then ligh-cured for the recommended time. Composite “crowns” were incrementally constructed and the after storage (37C/24 h) the specimens were sectioned in both “x” and “y” direction to obtain bonded sticks (0.8 mm2) to be tested in tension (0.5 mm/min). Half of the specimens were tested I or after 6M of water storage. A threeway ANOVA and Tukey test was used to statistically evaluate the data (0,05). For the clinical study, 120 restorations were placed in non carious cervical lesions in 30 patients, in a way that all four experimental conditions were placed in the same patient. The restorations were evaluated according the modified USPHS. The differences for each adhesive at baseline and 6 months were analysed Fisher’s (0,05) and the performance of each mode of application for each adhesive at each period of evaluation was evaluated by Mc Nemar’s test ( 0,05). In the immediate time, an increase in the BS and lower nanoleakage was observed when both adhesive were applied under A mode. However, after 6 months, the BS were reduced ad a higher nanoleakage occurred for both adhesives regardless the mode of application. Under the in vitro part of the study, 29 patients attended the 6 month recall. Only one AP restoration debonded after 6 months in the inactive mode. Based on the results of the present investigation one can conclude that: 1) although the vigorous application improves the immediate performance of the adhesive systems tested, no improvement was observed after 6 months of water storage. 2) After the short-term evaluation of 6 months no significant difference was observed in none of the USPHS items for the experimental conditions.