Microleakage of Bonded Amalgam Restorations
Aljazairy, Yousra H. . 1995
Microleakage at the amalgam restoration-dentin interface has been a major area of concern for many years. Currently, adhesive dentin bonding systems are used to bond and seal amalgam restorations to tooth structure. The purpose of this study was to evaluate quantitatively the effectiveness of two adhesive dentin bonding systems on reducing microleakage at the amalgam-dentin interface in comparison to the presently most used amalgam restoration sealing material Copalite varnish. Cylindrical occlusal cavities, 3 mm diameter and 3 mm depth, were prepared in 24 freshly extracted human third molars. Six samples were randomly assigned to each of the four following groups: unlined amalgam (UN), Copalite varnish (CO), and Amalgambond Plus (AM), All-Bond 2 (AL) adhesive systems. A fluid-under-pressure apparatus connected with the pulp chamber of each tooth was used to evaluate the permeability and marginal leakage of teeth before and after restorations at L6 Psi pressure. Following insertion of the amalgam restorations, microleakage (pl/min/cm HZO) was measured at 24hrs, 1 week, and 1, 3, 6 months. Data were analyzed by repeated measures ANOVA and showed a significant difference among the means of the groups (p<0.0001). At 24 hours all the restored teeth showed a significant reduction in microleakage compared to the unrestored teeth UN (p<0.001), Co (p<0.00L), AM (p<0.05) and AL (p<0.0001). At subsequent time intervals UN group showed a significant increase in microleakage (p<0.01). AM and AL groups at 3 and 6 months showed significantly lower microleakage than UN (p<0.01) and CO (p<0.05) groups. In this study both AM and AL adhesive systems are more effective than CO varnish in reducing the microleakage under amalgam restorations. No significant difference was found between the two adhesive systems in vitro at any intervals tested.
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