BOND STRENGTH OF VARIOUS RESTORATIVE MATERIALS BONDED TO HUMAN DENTIN USING DIFFERENT ADHESIVE SYSTEMS

Abstract

This present investigation was carried on ninty freshly I extracted human molars free from caries and previous restorations, collected from patient's clinic faculty of I dentistry, Tanta University. The teeth were stored in normal saline solution at 4°C to prevent their dehydration untill preparation and bonding phases. The occlusal surfaces of all I teeth were ground flat on a model trimmer to obtain a smooth planned sufaces • of occlusal dentin available for subsequent I bonding. The teeth were equally devided into two main tested groups (of 45 of each) relative to the two adhesive I bonding agents used; Scotchbond Multi-purpose plus and All-Bond2. Each group was then devided equally into 3 subgroups of (15 teeth of each) relative to the different I restorative materials applied amalgam, composite resin and ceramic according to the manufacturer's instructions. The I bonding agents were applied to dentin surfaces of the teeth which were•' holded by special designed cupper cylinder, followed by the application of different restorative materials I to• the bonded dentin surfaces. The specimens were then stored for one week in 100% relative humidity at 37C0 to I allow the complete setting and bond stabilization. All samples were sheared off in a dynamic universal testometric I universal machine, then the data of mean shear bond strength.