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Aims of the study: The aim of this study is to evaluate the effect of a flowable composite and total etch adhesive on shear bond strength of repaired composite with a different types of tooth colored restorations (microhybrid, nanohybrid, and ormocer). Materials and Methods Ninety Teflon mold (4 mm ×2mm), of Tetric® Ceram prepared then divided into two main groups 1st control ( without etching ), 2 ed etched with 37 phosphoric acid. Both groups were divided into three subgroups according to a type of adhesive applied, 1st control, 2 ed the Excite® and in 3ed the tgflow applied The second split of Teflon mold (4mm×1mm) placed onto the prepared specimen Each subgroup (1st control, 2 ed the Excite® and in 3rd the tgflow) were farther divided into three subgroups which entrain filled as fallow: 1st split filled with a Tetric® Ceram, in 2 ed split filled with Tetric N Ceram, and in 3 rd. split filled with Admira. Shear bond strength was measured by using Universal Testing Machine, and mode of failure examined by a stereomicroscope. Results: No significant difference in the surface treatment groups. For the adhesive, Tgflow showed superior shear value (32 48 MPa) comparing to other adhesives while for the composite materials, The Tetric N Ceram composite showed superior value of shear strength (28 21MPa) comparing to other materials Conclusions: Phosphoric acid has no effect on shear value of repaired composite while Tgflow and Tetric N Ceram give an improvement in its shear value All composites exhibited cohesive and adhesive type of failure.

The Effect of Various Surface Treatment Adhesives and Composite Materials on Repair Strength of Composite Resin