Cervical microleakage in composite restorations of primary teeth - in vitro study

Objective: The purpose of this study is to evaluate in vitro the cervical microleakage of two bonding systems (Group 1: Scotchbond Multi-Purpose-3M; Group 2: Clearfil Mega Bond-Kuraray) in occluso-proximal composite restorations of primary molars. Methods: Two occluso-proximat standard cavities preparations (vertical slots) were made in each one of the 11 primary molars. The cavities were fitted using adhesive systems (one for each cavity) and hybrid composite (Fittek Z250-3M) by incremental technique. The first increment was inserted horizontally at the cervical wall and light-cured with 100 mW/cm(2) intensity for 60 s (VIP (TM) -Bisco). Other two increments were inserted diagonally on the buccal and lingual portion and each one tight-cured with 200 mW/cm(2) intensity for 60 s. The restorations were finished and polished, and then partially seated and embedded in 0.5% methylene blue solution for 24 h. The specimens were sectioned mesio-distally and the dye penetration was evaluated (score from 0 to 3) under a stereomicroscope. Results: The statistical analysis (Qui square and Mann-Whitney non-parametric test) revealed no statistical difference (p=0.193) between the two adhesive systems tested. Conclusions: Both bonding systems provided small early cervical microleakage in occluso- proximal restorations of primary molars. (c) 2005 Elsevier Ltd. All rights reserved.