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CAD/CAM - international magazine of digital dentistry

18 I I CE article _ biomechanical principles clearancewasverifiedwitha2mmprepcheckfrom Common Sense Dental Products. After gross occlusal reduction was completed, theremainingenamelringwasmeasured(Figs.9a,b). The enamel rings were noted to be 1.5 mm, and the teeth were prepared for adhesively retained restorations.Iftheenamelringswerelessthan1mm, theteethwouldhavebeenpreparedontheaxialwalls to create retention for cohesively retained crowns. The remainder of the existing composite resin in #3 and the amalgam in #4 were removed. The occlusal surfaces of the preparations were blended into the interproximal areas using a KS2 bur to create smooth preparations (Figs. 10–15c). There was no retention or resistance form prepared to retain the restorations. TissuemanagementwasobtainedwithViscoStat Clear, gingival haemostatic gel, 25 percent (m/m) aluminum chloride (Figs. 16 & 17). Gingival re- traction was obtained using a two-cord system. First, a #00 size cord from Ultradent was placed on the mesial and distal of both preparations (Figs. 18 & 19). Additional haemostatic gel was used prior to the secondcord.Thesecondcordwas#2sizecordfrom Ultradent (Figs. 20 & 21a). A minimum of four min- uteswithbothcordsinplaceisneededforadequate retraction of the soft tissue (Fig. 21b). While waiting four minutes for gingival retrac- tion, the opposing teeth were scanned with the PlanScan wand to create a digital model (Figs. 22a–24c). The buccal surfaces were then scanned Fig. 26t_Final restorations, lateral view in PlanScan. Fig. 26u_Final restorations #3, slice view facial to lingual. Fig. 26v_Final restoration #4, slice view facial to lingual. Fig. 26w_Final restorations, lingual view. Fig. 26x_Milling preview. Fig. 26y_Try-in of restorations, occlusal view. Fig. 26z_Try-in of restorations lateral view. CAD/CAM 1_2015 Fig. 26xFig. 26w Fig. 26zFig. 26y Fig. 26t Fig. 26u Fig. 26v CAD0115_12-21_Young 02.03.15 12:39 Seite 7 CAD0115_12-21_Young 02.03.1512:39 Seite 7

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