| Objective:Self-etch resin cements were introduced to dentistry in the past20years and havegained rapidly in popularity with more than a dozen commercial brands now available.While a reasonable number of literature has been generated describing the properties andadhesion of these materials to various substrates, most dentist still have confusion over thecomposition,mechanism, and operating condition for Self-etch dual-curing composite resincements. Panavia F is the behalf of the fifth generation self-etching bonding system. Thebond performance of Panavia F is also affirmed by many scholars through their experiments.This experiment will use three different types of materials IPS-Empress II, In-ceram andCercon bond with enamel through Panavia F, and use silane coupling agent treatment, andtest the efficacies of different types of materials through the measurement of shear bondstrength test and observation with field emission scanning electron microscope, which willhelp dentist to choose marterials.Materials and methods:According to the specifications of2mm x2mm x4mm,proceed22ceramic samples ofIPS-Empress II, In-ceram and Cercon,the bonding surfaces were gradient polished to2000-grit with waterproof abrasive paper under a stream of water,then placed in distilledwater in an ultrasonic cleaner for1minutes. Sixty freshly extracted, morphologically intact,not defected human first, second premolar were selected. The root of the isolated teeth wasembed exposing the enamel with the height>8mm. The crown buccal enamel was strippedby carbide bur with lotic water with the area of3mm x3mm which is parallel to the longaxis of the tooth,then gradient polished to2000-grit,ultrasonic washed in5minutes. Thenrandomly divide the teeth specimens into6groups,10in each group, meanwhile, eachkind of all-ceramic material samples was randomly divided into2groups, correspondingwith teeth groups. In the case of use or not use the silane coupling agent bond the enamelwith ceramic. Samples with crack or bonding surface dislocated were sieved throughobservation with a stereoscopic microscope. Six samples were randomly selected from eachgroup, and were tested for the shear bond strength at the loading speed of0.5mm/min. Thedata were analyzed using the statistical software with ANOVA. The broken surfaces of the samples were observed under SEM.Results:1. Shear bond strength test:The results of single-factor ANOVA show that the type of all-ceramic material andwhether using the silane coupling agent have significant effect on bonding strength (P <0.05).Without the use of silane coupling agent, group A holds the highest bond strength, andwas significantly different from group B and group C (group A:22.50+1.75Mpa; groupB:19.01+1.95Mpa; group C:18.80+2.17Mpa; P <0.05); B group have bond stress slightlyhigher than that of C group, but no significant difference (P>0.05). Using of silanecoupling agent, the highest bond strength was in group AS, and there are significantlydifferent between both BS group and CS group (group AS:26.74+1.63Mpa; groupBS:20.69+2.30Mpa; group CS:19.42+2.04Mpa; P <0.05); while the bond stress of BSgroup is slightly higher than that in group CS, but there was no significant difference (P>0.05). Compare the SBS of each kind of material,using or not using silane coupling agent, itis found the SBS was increased in varying degrees when using silane coupling agents.Among them, group A and AS increasing the most, and there was significant difference (P <0.01); in group B and BS, group C and CS,bond strength although slightly increased butthere was no significant difference (P>0.05). The highest bond strength was in group AS,use Panavia F with silane coupling agent bonded IE II and enamel will get the maximumbond strength.2SEM observationObserve the bonding interface of enamel and materials use SEM, it is found the surfaceof ceramic has a certain roughness, but the pore is not obvious. It is smoother after coatedED primer on the surface of enamel, compared with the uncoated. Observe the brokensurfaces of the samples, it shows that group A and group CS are mostly cohesive failure,group C are interface failure,group AS,B,BS are mixed failure.Conclusion:This experiment bonding enamel and IPS-Empress II, In-ceram, Cercon by usingPanavia F, draw the following conclusions: each bond in this experiment can meet theclinical needs of bond strength. Panavia F used in IPS-Empress II and enamel adhesive has agood bonding performance, the bonding strength was significantly higher than that ofIn-ceram and Cercon. It can achieve satisfaction in bonding strength regardless of the use ofthe surface treatment. The bond strength of Panavia F with In-ceram and enamel bonding can only reach20+Mpa, so it should be cooperated with other surface treatment methods, inorder to obtain greater bond strength; and Panavia F used with no-sandblasting nor othersurface treatment Cercon zirconia and enamel, the bonding effect is not ideal. Onlycombined with silane coupling agents and other surface treatment methods, or increase theretention form, will it be possible to achieve better adhesion effect. |
PDF Full Text Request