Shear Strength Cacao Pulp Extract as Etching Material in Composite Resin Fillings

Abstract

Background: Bonding principle of composite restoration is mechanical-interlocking that resin tags on microporosity etched enamel surface. Acid etching material commonly used is 37% phosphoric acid. Cacao pulp is white slimy membrane that surrounds the cacao bean. Cacao pulp contains various weak acid compounds. Shear strength is maximum resistance of material to withstand loads that cause shear movement on material before released. Purpose: This research is doing on purpose to analysis about shear strength composite resin restoration using etching material of cacao pulp extract. Methods: This research is an experimental laboratory research with Post Test Only Group Design research. 4 groups sampel is EA group with phosphoric acid etching 37%, EPK group 100% with cacao pulp extract 100%, EPK group 50% with cacao pulp extract 50%, and EPK group 25% with 25% cacao pulp extract. After etching, sample was bonded then filled with composite resin. After filling, sample was cutten, then planted in acrylic resin with labial side facing up, then shear strength test carried out. Results: Mean of shear strength EA is 15,4MPa, EPK 100% is 5,86MPa, EPK 50% is 6,76MPa and EPK 25% is 5,13MPa. Data were analyzed using Anova parametric statistical test, which obtained significance value (p<0.05), means all treatment groups had significant differences. Furthermore, LSD follow-up test carried out to find which groups had significant differences. Conclusions: Cacao pulp extract can increase shear strength of composite resin even though mean of shear strength EPK 50% group is lower than 37% phosphoric acid etching group.