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40 I I industry report _ CLEARFIL SA CEMENT cosmeticdentistry 1_2011 root-canal posts, CLEARFIL SA CEMENT can also be applied directly into the cavity. Owing to the higher temperature in the oral cavity, the avail- able working time is thus reduced to approxi- mately 40 seconds. The thixotropic properties of CLEARFIL SA CEMENT enable easy insertion and positioning intothefinalposition,asthematerialflowsunder pressure (Fig. 4). Nevertheless, excess material willremainatthecrownmarginwithoutflowing away and can be coagulated slightly by applying a polymerisation lamp for two to five seconds, depending on the lamp’s power, so that it can be easily removed with an instrument, usually in one piece (Fig. 5). It is important that while re- moving the excess material, the crown be held fast in its final position. For ceramic and composite crowns, light polymerisation occurs for 20 seconds from both sides after removal of excess material. As CLEARFIL SA CEMENT is dual-curing, the final chemical polymerisation of the areas that can- not be reached by light is achieved after five minutes, meaning that CLEARFIL SA CEMENT can also be used under metal restorations. Cleaning of the approximal spaces with SuperFloss (Oral-B) and the removal of the re- traction cord are carried out after complete light- and chemical curing (Fig. 6). CLEARFIL SA CEMENT ensures a tight marginal fit and does not influence the colour shade of the ceramic or composite restoration. Figure 7 shows the completed restoration in situ directly after insertion and removal of the retraction cord. Figures 8 and 9 show the non-irritated state at one week after insertion of the prosthetic provision for tooth #13. The marginal fit is tight and the transition cannot be seen with the naked eye. _Summary In the case described, IPS e.max Press, a lithium-disilicate glass-ceramic restoration, was inserted with the self-adhesive composite cement CLEARFIL SA CEMENT. This product is distinguished by its efficient Automix appli- cation and its dual polymerisation mechanism. The application of the material and the insertion of the restoration are made easier thanks to the thixotropic effect. CLEARFIL SA CEMENT provides secure me- chanical and chemical bonding to tooth struc- tures and restorations. It can be used in many application areas ranging from metal, ceramic and composite restorations to root-canal posts. The thin layer of CLEARFIL SA CEMENT and low solubility ensure long-term prosthetic success._ _References 1.Iwamoto N, Uctasli S, Ikeda M, Nakajima M, Tagami J. Shear Bond Strength of New Self Adhesive Cement to Enamel and Dentin.InternationalSymposiumforAdhesiveDentistry2008in Kanazawa.Abstract #P-24. 2.Yamamoto H, Nakamura T,Wakabayashi K, Okada A, Kinuta S, Yatani H. Mechanical Properties of New Self-adhesive Resin BasedCement.InternationalSymposiumforAdhesiveDentistry 2008 in Kanazawa.Abstract #P-28. 3.SadrA,ShimadaY,TagamiJ.MicroleakageofClass-VInlaysus- ing an Experimental Self-Adhesive Resin Cement. IADR Meet- ing inToronto,2008.Abstract #0404. Kuraray Europe GmbH BU Medical Products Hoechst Industrial Park/F 821 65926 Frankfurt/Main Germany dental@kuraray.eu www.kuraray-dental.eu cosmeticdentistry _contact Figs. 8 & 9_One week after insertion of the ceramic crown on tooth #13 the gingiva appears to be free of irritation. The marginal fit is tight and the transition cannot be seen with the naked eye. The natural colour of the ceramic is not influenced by CLEARFIL SA CEMENT. Fig. 9Fig. 8