Abstract
The aim of this study was to compare the microleakage of total-etch and self-etch adhesives by three methods including dye extraction, dye penetration and fluid filtration with determining the correlation value among these techniques. Seventy-two premolar teeth were selected for this in vitro study and Class 5 cavities were prepared on the buccal surface of these at the cementoenamel junction area. It was applied for half of these cavities, Optibond Solo Plus (OSP) (two-step etch & rinse) and another half, Optibond All-in-One (OA) (one-step self-etch) and then all of them were restored with a light cure resin composite; Herculite XRV. Then samples were divided randomly into three subgroups based on the method of microleakage measurement (n = 12). In the first pair group, leakage was assessed by the dye extraction method. Dye penetration and fluid filtration methods were used in the second and third pair groups for the same purpose respectively. Data were analyzed by Paired t-test and Wilcoxon test and correlation coefficients (α = 0.05). There was no significant difference in the dye extraction (P = 0.657) and dye penetration (P = 0.732) methods between the microleakage of total-etch and self-etch adhesives. Microleakage of self-etch adhesive in fluid filtration technique was significantly more than total-etch adhesive (P = 0.012). No significant correlation was found among the results obtained with the three methods of microleakage evaluation. Adhesive systems showed variously behave in different methods of microleakage assessment.
Highlights
One of the esthetic materials which are used for restoration of Class V caries lesions is a resin composite with various dentine bonding systems which adhering the resin composite to tooth [1]
Seventy-two premolar teeth were selected for this in vitro study and Class 5 cavities were prepared on the buccal surface of these at the cemento-enamel junction area. It was applied for half of these cavities, Optibond Solo Plus (OSP) and another half, Optibond All-inOne (OA) and all of them were restored with a light cure resin composite; Herculite XRV
The evaluation of microleakage is performed by different methods, such as air pressure, bacterial assessment, radioisotope studies, scanning electron microscopy, chemical identifiers, electrochemical studies, and measurement of dye penetration [11,22,23]
Summary
One of the esthetic materials which are used for restoration of Class V caries lesions is a resin composite with various dentine bonding systems which adhering the resin composite to tooth [1]. An important factor in the success of the RC restorations is the properties of adhesive bonding agents. The key advantages of SE adhesives are their easy and fast application procedures [5]. The cavity extends below the cementoenamel junction (CEJ) with the margins in dentin; microleakage, gap formation, and inappropriate adhesion to dentin remain considerable problems [10]. An adhesive restoration may not attach properly to the etched dentineand forming marginal gap and microleakage [13].
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