Comparison of shear bond strength of three adhesive liners to nanocomposite: an in vitro study

Aim: To compare the shear bond strength of three different linersto nanocomposite restorative material. Material and method: Twenty sound human posterior teeth extracted for periodontal and orthodontic reasons were selected and sectioned mesiodistally to obtain forty samples. Class V cavities of specified dimensions were prepared on 30 samples using a straight fissure diamond bur with high speed hand piece under air water spray. After cavity preparation specimens were divided into three groups on the basis of liner used to fill the cavities, Group 1- filled with resin-modified glass ionomer, Group 2- filled with SDR liner, Group 3- filled with flowable composite liner.Remaining 10 samples were wet ground with a polishing paper to expose superficial layer of dentin and considered as control group. The prepared samples in each group were then bonded witha cylinder of nanocomposite. Shear bond strength was determined using Instron universal testing machine. The data was analyzed statistically.