composite resin bond strength to zirconia and base metal alloys using two types of intraoral porcelain repair systems

Objectives: this study aimed to evaluate the shear bond strength (sbs) of two repair composites (crea.lign vs. permaflo) to a base metal alloy and zirconia ceramic.materials and methods: sixty-four discs (12mm diameter, 1mm thickness) were fabricated using wirobond base metal alloy and zirconia. they were then bonded with their respective composite resins (n=16) in each of the two porcelain chipping repair kit subgroups consisting of permaflo and crea.lign. all specimens were stored in 37°c distilled water for 24 hours. half of them were subjected to 10,000 thermal cycles (5-55°c, 30s). all specimens were tested for sbs with a universal testing machine. failure types were analyzed using a digital camera. analysis of the data was done by two-way anova and bonferroni post-hoc tests.results: sbs was significantly affected by the type of composite resin. permaflo had a significantly higher sbs than crea.lign to base metal alloy (p<0.001) and zirconia ceramic (p<0.001). thermocycling decreased the sbs of both composites to base metal alloy (p<0.001) and zirconia (p<0.001).conclusion: a universal adhesive could provide higher shear bond strength of zirconia and base metal alloy to composite resin than crea.lign composite and the mkz primer supplied by its manufacturer.