Microleakage Comparison of Adhesive Systems in Class V Composite Restorations
The development of adhesive systems continue to progress towards a reduction in micro leakage at cavity margins. The objective of this study was to compare the microleakage in class V composite restorations using several self-etch bond agents and a standard total-etch control. Class V cavities were prepared on the buccal and lingual surfaces of 20 third molars previously stored in 0.2% sodium azide. Ten preparations for each of the three self-etch bonding systems (AdheSE, SE bond, UniFil) and one total etch control (Excite) were all restored with resin composite ( 4-Seasons ). Restored teeth were finished, placed in distilled water for 24 hours, and thermocycled between water baths of 5 and 55°C with a 1-minute dwell time for 1000 cycles. Apices were then sealed with epoxy resin and two coats of varnish applied to within lmm of the cavity margin. Teeth were placed in 0.5% basic fuschin dye for 24 hours, rinsed and embedded in self-curing resin. A slow speed diamond saw was used to cut embedded teeth buccal-lingually to produce multiple sections for each restoration. Under a light microscope ( 40X) micro leakage was ranked (0-4 ordinal scale) with the consensus of two evaluators at the occlusal and cervical margins. Data were analyzed with Kruskal-Wallis One-Way Analysis ofVariance and a Pairwise Sign Test (confidence interval= 0.05). A statistically significant difference was determined between the cervical and occlusal margins that was material-dependent at p<0.05. At the occlusal margin the total-etch system (Excite) provided a superior seal compared to 2 (AdheSE and Unifil) of the 3 self-etch systems (SE bond, AdheSE and Unifil). At the cervical (dentin) margin each of the 3 self-etch systems demonstrated less microleakage compared to the total-etch control.