A COMPARISON OF THE BOND STRENGTH TO ENAMEL AND DENTIN OF 2 COMPOMERS- AN IN-VITRO STUDY

The aim of this study was to evaluate the bond strength of two resin-r einforced glass ionomer cements to etched and unetched enamel and to d entin. Thirty-six noncarious human premolar teeth were used. Flat bucc al and lingual surfaces were prepared. Dyract and Compoglass were used . The teeth were distributed at random into six groups of six teeth ea ch. The materials were handled according to manufacturers' instruction s. In groups 1 and 3 the enamel was etched with 37 percent phosphoric acid. All samples were sheared with an Autograph AG5 machine at a cros shead speed of 0.5mm/min. Two way ANOVA and comparison with the Tukey test were used to evaluate the results. These showed that on etched en amel Dyract had a significantly higher bond strength (p=0.02); on unet ched enamel Compoglass had a statistically higher bond strength (p=0.0 03) and on dentin the materials provided the same bond strength. Overa ll, disregarding surfaces, there was no difference between the two mat erials.