cosmetic dentistry_ beauty & science International

18 I I industry report _ CLEARFIL SE BOND _Electron microscopic examination of the interface between CLEARFIL SE BOND and human tooth tissue FE-SEMoftheresin–intacttoothtissueinterface The FE-SEM picture of the resin–enamel interface is shown in Figures 3 and 4. Both images present the resin–enamelinterfacesubjectedtotheargonionbeam etching.Theupperhalfisthesetbondinglayerandthe lower half is the enamel layer. The superficial enamel wasfinelyanddenselyetched, and the hydroxyapatite crys- talsoftheenamelprismwere decalcified. Nonetheless, this demineralisation process is not as destructive as that of conventional phosphoric acid etching, yet the junction at the resin- enamel interface was extremely tight, pro- ducingsmallanddense resin tags. The micro- fillerparticlesappearin theupperhalfofbondinglayer. The FE-SEM picture of the resin–intact den- tineinterfaceisshowninFigures5and6.Theupperhalf isthesetbondingagentandthelowerhalfisthedentine layer. The junction between the resin and dentine was verytightandthehybridlayerofabout1µminthickness inthesuperficialdentinelayerwasveryclearwhensub- jectedtotheargonionbeametching.Thedentinewasre- movedusing10%phosphoricacidand5%hypochlorite (Fig.7).Thesetresintagspenetratingthedentinaltubules were clearly demonstrated and small resin tags pene- trating lateral branches of the dentinal tubules showed theimprovedtreatmenteffectoftheCLEARFILSEBOND. FE-SEMoftheresin–cariousdentineinterface The carious lesion of the extracted third molar was removedbymeansoftheCARIESDETECTORaccording to the routine technique. The prepared cavity was restored using CLEARFIL SE BOND and CLEARFIL AP-X resin paste. The resin–dentine interface is shown in Figures 8 and 9. The specimen was argon ion beam etched. The very clear hybrid layer was demonstrated inthesuperficiallayerofdentine.Theupperhalfisthe setbondinglayer,followedbythehybridlayerandden- tineinthelowerhalf.AsshownintheFE-SEMpictures, CLEARFILSEBONDshowedtightadhesiontothecari- ous dentine through the hybrid layer. These FE-SEM findingsrevealedthatCLEARFILSEBONDcouldadhere aswelltothecariousdentineastotheintactdentine. _Conclusion It has been about 30 years since the resin bonding system was introduced to dental operations. Today, anterior and posterior cavities are restored with resin bonding.ThehistoryofKuraray’sresinbondingsystems is synonymous with the 30-year history of resin bond- ing.Modernresinbondingisabletodecreasethetreat- ment time, patient’s discomfort and operator’s mental andphysicallabour. The most modern system is two-step, self-etching primer resin bonding, and is indicated not only for caries treatment, but also for repairing restorations in combination with Kuraray’s ALLOY PRIMER or CLEARFIL PORCELAINBONDACTIVATOR.TheCLEARFILSEBONDis abletocreateastrongandstablebondtohardtoothtis- sue,andtheresincompositepasteisabletoadaptexcel- lently to the cavity walls treated by CLEARFIL SE BOND. Furthermore,mouldingandshapingitisextremelyeasy. WethusbelievethattheCLEARFILSEBONDresinbond- ingsystemwillgreatlycontributetoglobaloralhealth._ Fig. 8_FE-SEM (argon ion beam etched surface; x 10,000) of the resin–carious dentine interface. The upper half is the set bonding agent and the lower half is the dentine layer. The junction between the resin and dentine was very tight, and the hybrid layer in the superficial dentine layer was clear. But the junction between the hybrid and underneath dentine layer was not distinctive. Fig. 9_FE-SEM (argon ion beam etched surface; x 20,000) of the resin–carious dentine interface. The junction between bonding, hybrid and dentine layer was tight and continuous. cosmeticdentistry 3_2011 Kuraray Europe GmbH Industriepark Höchst,Building F 821 65926 Frankfurt/Main,Germany dental@kuraray.eu www.kuraray-dental.eu (EU) www.kuraraydental.com (USA) cosmeticdentistry _contact Fig. 8 Fig. 9 Fig. 10