Hasanreisoğlu, UfukErakman, Tansu2022-06-222022-06-222011http://hdl.handle.net/20.500.12575/82206In this study, microtensile bond strengths of a self adhesive luting cement applied to dentinalone or in combination with two bonding agents having different adhesion strategies werecompared with those of two different bonding agent/composite luting cement systems appliedusing conventional adhesive cementation technology. Furhermore, effect of simulated pulpalpressure and mechanical loading on microtensile bond strength of these approaches wereinvestigated. For this purpose mid-coronal occlusal surfaces of 75 sound human molar teethwere used.Teeth were randomly divided into three groups according to different experimental conditionswith each group having 25 teeth. First group was selected as control. Simulated pulpalpressure was applied during cementation process (20cm H2O) in the second group (PB). Testsspecimens were subjected to mechanical loading after cementation procedure in the thirdgroup (MY). Each group was divided into five subgroups with five teeth each, according tothe bonding agent and/or luting cement combinations; 1. RelyX Unicem (RU) 2. RelyXUnicem + Clearfil SE Bond (RUSE) 3. RelyX Unicem + Adper Single Bond Plus (RUSB) 4.Panavia F 2.0 + Clearfil SE Bond (PFSE) 5. RelyX ARC + Adper Single Bond Plus (RXSB).Pre-built composite blocks were luted to the prepared teeth with one of these protocols. Bondstrengths were evaluated with microtensile bond strength test. Failure modes were analysedwith stereo microscope and classified as cohesive (in dentin, luting cement, composite resinrestoration), adhesive (between composite resin-luting cement, luting cement-dentin) or mix(cohesive+adhesive).In control group, application of self-etching SE and and etch-and-rinse SB bonding agentsbefore luting agent significantly increased the bond strength of self adhesive luting cementRU to dentin. In PB and MY groups significant decreases in bond strengths were recordedwith all bonding protocols. In both groups, pretreatment of dentin surfaces with SE and SBdid not improve the bond strength of RU. Orientation of dentin tubules affected the80performance of adhesive systems in some of the test groups. Adhesive failure between dentin-luting cement was the predominant failure mode in all the groups.It may be concluded that further researches, simulating the clinical situations should beperformed in order to reach consistent results about the reliability and long term durability ofrecently developed adhesive systems.tradeziv yapıştırmadoctoralThesis