Chamfered margin effects on occlusal microleakage of primary molar Class I composite resin restorations in vitro.

Recent clinical studies have suggested that composite resin may be an effective restorative material for the restoration of Class I preparation in primary molars. The primary objective of this study was to assess the effects in vitro of a chamfered margin on occlusal microleakage of class I posterior composite resin restorations in primary molars. Two cavity preparations (conventional and modified) were compared by using forty extracted primary molars. The modified class I preparation as described in this study showed no occlusal microleakage and recommended to be further studied clinically. The difference between these two groups was analyzed by using the Fisher Exact Probability Test and was statistically significant.