The effect of various surface treatment adhesives and composite materials on repair strength of composite resin

Abstract EN

Aims of the study: The aim of this study is to evaluate the effect of a flow able composite and total etch adhesive on shear bond strength of repaired composite with a different types of tooth colored restorations (micro hybrid, Nano hybrid, and roomer).

Materials and Methods Ninety Teflon mold (4 mm × 2mm), of Tetric Ceram prepared then divided into two main groups 1st control ( without etching ), 2ed etched with 37 phosphoric acid.

Both to a type of groups were divided into three subgroups according adhesive applied, 1st control, 2ed the Excite® and in 3ed the glow applied The second split of Teflon mold (4mm × 1mm)placed onto the prepared specimen Each subgroup (1st control, 2ed the Excite® and in 3rd the glow) were farther divided into three subgroups which entrain filled as fallow : 1st split filled with a Tetric® Ceram, in 2ed split filled with Tetric Ceram, and in 3 rd.

split filled with Admire.

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, Glow showed superior shear value (3248 MPa) comparing to other adhesives while for the composite materials, The Tetric Ceram composite showed superior value of shear strength (2821MPa) comparing to other materials Conclusions : phosphoric acid has no effect on shear value of repaired composite while Glow and Tetric Ceram give an improvement in its shear value All composites exhibited cohesive and adhesive type of failure.