Methods:Occluso-proximal standard cavity preparations were made in 30 non-carious human primary molars. The cavities were restorated using two self etching bonding systems (AdheSE One +Tetric EvoCeram, Adper SE Plus+Filtek Z250) and a total etching bonding systems (Adper Single Bond2+Filtek Z250) by incrementally technique and polymerized with LED curing unit. The restored teeth were thermocycled 1000cycles between 5 and 55 degreesC with a dwell time of 10 s in each water bath. After thermocycling, teeth were isolated with nail varnish and immersed in % 0.5 basic fucsion for 24h for microleakage test. The specimens were sectioned mesiodistally into slabs with a diomand saw under water lubrication. The extend of dye penetration along the cavity walls were measured with digital image analysis (mm). Microleakage data of each restorations in each slaps was recorded indiviually. The data were analyzed with two-way ANOVA, Kruskal-Wallis and Mann Whitney U.
Results:The statistical analysis revealed that microleakage of Adper Single Bond 2 was significantly lower than that of Adper SE Plus and AdheSE One (p<0.05). No significant difference was found between Adper SE Plus and AdheSE One (p>0.05).
Conclusion: Neither of the three adhesive systems was able to completely prevent leakage in occluso-proximal cavity of primary molars. However, the lowest microleakage value was obtained with total etching bonding system-Adper Single Bond 2.