Microleakage between two filling restorative techniques using glass ionomer cement in primary molars: comparative "in vitro " study

Abstract

This study evaluate the marginal microleakage in deciduous molars cavities restored with ionomer cement modified by resin (Vitremer, 3 M) comparing two different techniques: the conventional (according to manufacturer instructions) and with the hybridization technique (acid phosphoric 37% and adhesive system Scotchbond Multi Pourpose , 3M). Proximal cavities were prepared in 20 sound deciduous molars, right after extraction. The samples were randomly divided in two groups. Group 1 consisted in teeth prepared with the conventional technique and in the group 2 teeth with etching by phosphoric acid and adhesive system. The teeth were submitted to termical cycle process (100 cycles, each one of 3 sub cycles of 5o C, 37o C and 55o C - by 60 Sec of bath immersion each one), after restorations. After that, the teeth were impermeable with nail polish and wax #7 keeping 2mm of area in the junction of the cervical restoration margin, and them immersed in methylen blue solution to 0,5% , seccionated and evaluated by one examiner, who established the microleakage degree. The data reveal the both techniques show the micro infiltration in different degree, but it has no statistical difference between techniques.