Evaluation of Marginal adaptation at Interfaces Using Composite Resin to Different Setting Amalgam Filling in Class II Cavity Preparation

Abstract

Aim: The objective of the present study was to evaluate the microleakage of composite restorations alone or
with amalgam base in proximal box of class ? cavity preparation.
Methode: Eighty proximal cavities (Mesio-occlusal and disto-occlusal) were prepared in 40 premolars
with carbide bur and randomly divided into four groups. Group A restored with composite resin; the other
three groups restored with combined amalgam-composite restoration as follows. Group B the composite
inserted immediately after insertion of amalgam, group C the composite inserted after 5 minutes of amalgam
insertion while in group D the composite inserted after two days of amalgam insertion. Marginal adaptation
was evaluated at the following interfaces: tooth-amalgam(T-A), tooth-composite resin (T-C) and amalgamcomposite (A-C). Microleakage was evaluated by means of methylene blue infiltration after 21 days water
storage and thermocycling aging. Microleakage was assessed by measuring the depth of horizontal dye
penetration. Image J analysis software was used to measure the penetration of dye in the tooth- filling
interface and in the amalgam- composite interface. One-way ANOVA and post-hoc Tukey HSD tests (?
=0.05) were used statistically for analyzing gather data.
Results: There were a significant statically showed by ANOVA test between teeth -fillings interface,
according to Tukey’s test there were a significant difference between teeth-composite interface and teethamalgam interface (p<0.05), while between composite- amalgam interface, ANOVA test showed a significant
difference between groups and Tukey’s test showed a significant difference between groups according to
time of placement of composite on amalgam filling (p<0.05).
Conclusion: Using of amalgam at the cervical base of the box in Class II combined amalgam-composite
restoration has better result than using of composite from marginal leakage view.