Study On The Effect Of Different Nuclear Materials On The Flexural Strength Of Fiber Pile And The Effect Of Cement On Bond Strength Of Porcelain - Resin

【objective】 to5kinds of resin material, respectively, with the glass fiber postcementation, combination comparison between groups of flexural strength. Choose betterflexural strength of a material by three clinical commonly used bonding between cementand zirconia porcelain, differences in shear strength. So as to provide guidance for clinicalmaterial choice.【Method】 Experiment1:50viva glass fiber post were randomly divided into5groups, respectively with dual curing resin cement, Tina Medental dual curing resincement, Bisco BisCem light-cured resin cement,3m nano composite resin P60andPulpdent dual curing resin cement bond, the root canal part of five groups of pile nuclearseparately with self-curing plastic embedding, fixed in the universal testing machine andafter curing and tooth length axis at135°Angle of load in the core, the loading speed is1.0mm/min, until the break, when measured fracture stress and fracture mode. Experiment2: to compare the experimental conclusion resin core, different binder of zirconia ceramicand resin bond between the effect of the shear strength. Methods: making resin piece of5mm x5mm x5mm,30. Production of zirconia ceramics all specimens3mm x4mm,3mm thick specimen1030in each group is divided into three groups, A, B, C,10in eachgroup, sandblasting processing:10mm off the ceramic tile surface, at0.25mp pressurewith50umal O sand sandblast10s. With ethanol ultrasonic cleaning wastewater aftersandblast porcelain face3min. With three blow dry with a gun. Shear strength experiment:group A binder poly carboxylic acid zinc, group B Medental dual curing resin cement,group C Bisco BisCem resin cement group. With finger pressure, remove excess cement,and use the light curing light from above and left and right sides of the light. To cement itsembedding in the resin after curing block and fixed on the experiment, set the speed ofloading head to5mm per minute, the direction of the load and the bonding surface parallelto the load divided by the cross section area is calculated using formula of shear strength.【Experiment result and conclusion】Experiment1: Medental dual curing resin cement group, Tina dual curing resin cementgroup, Bisco BisCem light-cured resin cement group,3m nano composite resin P60andPulpdent dual curing resin cement group of flexural strength, respectively (83.248+/-7.857),(89.230-4.326),(95.188-5.147),(76.646-6.463),(83.064-3.964) N. Medental dualcuring resin cement group with dual curing resin cement Pulpdent flexural strength nodifference, comparing two differences between groups were significant (P <0.05). Resultsshow that Bisco BisCem after bonding resin and fiber cement pile has higher flexuralstrength.Experiment2: bond shear strength SPSS18.0statistical analysis was carried out on theexperimental results, the shear strength of group A was10.08+/-5.27MPa, the shearstrength of group B was22.48+/-6.46MPa, the shear strength of group C was25.32+/-8.11MPa to single factor analysis of variance, the shear strength of group A is greaterthan B, C in the two groups, P <0.05, however, basic no difference between group Bgroup C. Damage to the specimen surface to observe and record the failure modes, theresults are shown in table1, group A damage occurs mostly in nuclear materials andbinder, only A small part of the mixed failure happens, watch these mixed failure surface,severely damaged between nuclear materials and cement, no damage occurs betweenbinder and porcelain surfaces.