Avaliação in vitro da microinfiltração em restaurações de molares decíduos, com a utilização de adesivos monocomponentes

Resumo (EN)

Introduction – The purpose of this study was to evaluate the marginal microleakage in interfaces between the gingival edges of the proximal box of Class II cavities and several adhesive monocomponent systems. So that, five different single bottle systems were applied on deciduous molars restored with a light-cured composite resin (Z100™, 3M Corporation), as follows: Prime & Bond® 2.1 (Dentsply International Inc.), One Step® (Bisco Inc.), Optibond® AIO (Kerr Corporation), Single Bond (3M Corporation), Bond-1® (Pentron Clinical Technologies, LLC). A conventional system with separate bottles (Scotchbond™ Multi-Purpose Plus, 3M Corporation) was used as the control group. Material and Methods – Samples comprised 24 deciduous molars divided in six groups of four teeth, in which 48 Class II cavity preparations (MO-OD) were made. Two different adhesives bonded to dentin were applied in the respective cavity of each tooth (MOOD). The teeth were restored with a composite resin and stored in distilled water. Subsequently, they were thermocycled (700 times of 5°C and 55°C), waterproofed by staining solution (50% silver nitrate), and sliced. Microleakage evaluation was performed by a morphometric analysis system in the Laboratory of Dentistry Computer Science (LDCS) at School of Dentistry at São Paulo University, using the software Image Lab. Results – The following microleakage values (mean) were observed for the adhesive systems evaluated: 0.13 mm (One Step®), 2.1 to 0.27 mm (Prime & Bond®), 0.28 mm (Scotchbond™ Multi Purpose Plus), 0.29 mm (Single Bond), 0.34 mm (Bond-1®), and 0.37 mm (Optibond® AIO). Conclusions – After the statistical analysis (Kruskal-Wallis), it was concluded that all groups showed low microleakage values, despite no statistically significant differences (p < 0.05) were detected among the materials evaluated.