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achieved. Additionally, the cement does not need to be protected from ambient light during mixing and placement. Prior to application, the primer liq- uids(MultilinkA/B)weremixedina1:1 ratio.Amicro-brushwasusedtoapply and lightly scrub the primer mix on the preparation enamel and dentine for15seconds.Theprimingagentwas allowedtosetontheenamelandden- tine for 30 seconds, after which time air was used to evaporate the primer solvents. Because the primer is self- curing, light-curing was unnecessary. The luting composite (Multilink Automix) was extruded from the mix- ingtipandplaceddirectlyontheinner surfacesofthelithiumdisilicatecrown(Fig.10).The lutingcompositewasplacedcarefullytoensurethat all internal surfaces were fully covered. The lithium disilicate crown was then seated on tooth #13 and slight pressure applied (Fig. 11). A micro-brush was utilised initially to remove excess cement from the interproximal spaces and cervicalareasofthecrown(Fig.12).Furtherpressure wasappliedwithdentalforcepstoensurethecrown remainedseatedintheproperpositionduringinitial clean-up (Fig. 13). While still applying pressure to theseatedcrown,excesscementbetweentheinter- proximal areas of the crown and surrounding den- tition was removed with dental floss (Fig. 14). After flossing, the crown was cured with an LED curing light(bluephaseG2,IvoclarVivadent)onthebuccal, mesial, lingual and distal surfaces (Fig. 15). The in- terproximalspaceswerethenflossedtoensurethat all excess cement had been removed (Fig. 16). Upon completion of the case, the CAD/CAM- processed lithium disilicate glass-ceramic crown cemented with the dual-curing luting composite demonstrated excellent fit, function and strength (Figs. 17–20). Additionally, a post-operative radi- ograph confirmed that all excess cement had been removed and excellent internal/marginal adapta- tion achieved (Fig. 21). The patient was very pleased with the aesthetics of the crown, which appeared natural and indistin- guishable from the surrounding dentition. Further, the patient was pleased that he did not have to return for another appointment because the chair- side CAD/CAM system allowed the restoration to be scanned, designed, milled and seated in a single appointment. _Conclusion I use the CEREC CAD/CAM system almost ex- clusivelyinmypracticebecausepatientsappreciate the quality, immediacy and not having to return for additional appointments. Restorations milled with CEREC demonstrate the form and fit required for restoring even the most challenging cases. Patients also enjoy the high aesthetics and strength of lithium disilicate glass-ceramic IPS e.max that has been milled with CEREC._ Editorial note: A complete list of references is available fromthepublisher. Figs. 18–20_The final restorative result demonstrates excellent fit, function and lifelike aesthetics. Fig. 21_The final radiograph confirms that proper internal and marginal adaptation has been achieved, along with complete removal of excess cement. case report _ crown fabrication I I 13CAD/CAM 3_2011 Dr Brian Buehler has been practising dentistry for more than 20 years.He received his DDS from the University of Southern California’s School of Dentistry in LosAngeles and his BA in Economics from the University of California, LosAngeles.Buehler has worked as a beta-tester for both Sirona and E4D.He still works as an advisor to Sirona in product development and placement. Dr Brian Buehler Laguna Beach Dental Group 31796 South Coast Hwy. Laguna Beach,CA 92651 USA www.lagunabeachdental.com CAD/CAM_about the author Fig. 21 Fig. 19 Fig. 20 Fig. 18