الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The improvement of adhesive restorations is continous to improve their clinical durabilities, and reduce their drawbacks.The adhesive materials routinely used among dental professional. But their inferior reinforcement of tooth structure, and their microleakage with subsequent secondary caries, pulp irritation and discolouration. Many studies concerned with studing cuspal difflection with different restorative materials. But fewer studies evaluated cuspal deflection with adhesive materials. While other studies evaluated microleakage incidence with these adhesive restorative materials. ?This study aimed to evaluate cuspal deflection of MOD cavities in upper premolars restored with Alloybond & SDI amalgam capsules, Tetric Ceram with Syntac and Tetric Ceram with Excit during setting reaction and after functional loading. And evaluate mucroleakage incidence after TCML test of these adhesive materials. Then correlate cuspal deflection records and microleakage scores. In this study : one hundared and forty human maxillary premolars were collected. MOD cavities prepared wit ismuth width equals to 1/3, 1/4 I.C.D respectively with pulpal floor depth 3 mm from cavosurface angle. These cavities restored with SDI amalgam capsules and Alloybond, Tetric Ceram with Syntac and Tetric Ceram with Excit. Two element straingages attached buccal and palatal surface of premolar. where small flexible jumper wires, curved to form strainrelief loops to connect gauges to bendable terminal, to form wheatstone bridge.Then microstrain reading were registred (opposite to lateral displacement of cusps due to residual stresses and functional stresses. MOD cavities resotored wirth these restorations, were subjected to TCML, to evaluate effect of this test in microleakage incidence of these adhesive restorations.The results of this study was that, Alloybond and SDI amalgam reduce incidence of cuspal deflection over Tetric Ceram either with Syntac or Excit.Alloybond and SDI amalgam represent lowest microleakage scores, than those with Tetric Ceram either with Syntac or Excit. There was highly significant correlation between cuspal deflection records and microleakage of the adhesiverestorations used.