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Dental Tribune Middle East & Africa Edition | March-April 2015 13aesthetics < Page 12 cure veneer cement or the dual-syringe dual-cure resin, the light-cure method was used because the veneers were not inordinately thick. NX3 allows veneers to be cemented all at once (as opposed to cementing cen- trals first, laterals second, and so on) because of its unique “thixotropic” proper- ties, which enable them to stay where they are placed prior to light-curing. This feature makes adjustments and proper place- ment easier while decreasing the need to adjust the veneers interproximally if space is need- ed once they are cured. Prior to final curing, the res- torations were spot-cured for several seconds to allow the ex- cess cement to be cleaned (Fig- ure 10). The veneers then were light-cured for 40 seconds per surface (Figure 11). (Note: Man- Dr. Mitch Conditt, a 1985 gradu- ate of Baylor College of Dentistry in Dallas, TX, lectures interna- tionally and has published nu- merous articles reviewing all as- pects of restorative and cosmetic dentistry. About the Author ufacturer instructions allow for 10-second cures with the L.E. Demetron II. In this case, how- ever, the doctor’s discretionary use was 20-second cure times.) Occlusion was adjusted using a fine diamond bur and the lin- gual aspects of the teeth were finished and polished using CeraGlaze® Porcelain Polishing System (Axis Dental), rendering a very satisfied patient (Figures 12 and 13). Fig. 1: Pre-op Fig. 4: Expasyl-preven #232DC3 Fig. 7: Curing Solo Plus Fig. 10: Cleaned cemen #232DC7 Fig. 2: Anterior upper pre-op Fig. 5: Kerr etch Fig. 8: Cured bonding agent Fig. 11: Cure-Demetron Fig. 3: Temps off-teet #232DC4 Fig. 6: Optibond Solo Plus Fig. 9: Veneers w NX3 #232DB6 Fig. 12: Final shot-da #232DC8 Fig. 13: Post-op Conclusion Cementation is an important aspect of functional aesthetics. An understanding of chemistry, technology and physical proper- ties are all essential to proper us- age and clinical success. Cement selection was the driving factor in choosing the bonding system for this case. NX3 Nexus® Third Generation cement is free of amines—organic compounds containing nitrogen as their key atoms—which were largely blamed for the colour shifts so prevalent with earlier cement formulations. In an earlier use of the product the cement proved to be “thixotropic,” the consist- ency of non-drip paint; the resto- rations were seated and adjusted before curing with no dripping or running. Color stability, ease- of-use and cleanup, color match and optimum retention are some of the attributes necessary when choosing a cement—NX3 met all of these expectations. References 1. Kugel G, Ferrari M: The sci- ence of bonding: from first to sixth generation. J Am Dent As- soc. 2000 June;131 Suppl:20S- 25S. 2. Touati B, Miara P: Light trans- mission in bonded ceramic restorations. J Esthetic Dent 1993;5:11–18. 3. Sheets C, Taniguchi T: Advan- tages and limitations in the use of porcelain veneer restorations. J Prosthet Dent 1990;64:406–411. Contact details available from the publisher