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ePaper created 2015-03-06, 14:42:46 | version 1.33.01
I 15 CE article _ biomechanical principles I CAD/CAM 1_2015 a reduced enamel ring width. A decrease in the size of the enamel ring thickness from 1.5 mm to 1 mm increased the failure rate dramatically. An enamel ring of less than 1 mm in width would be a con- traindicationforanadhesivelyretainedrestoration, andacohesivelyretainedrestorationwouldthenbe required.7 A restoration bonded to enamel also pro- vides a margin with reduced or no microleakage.8 _Summary Aminian and Brunton (2003) stated: “The removal of sound tooth structure is an unfor- tunate biological compromise. The conservation of sound tooth structure, therefore, represents an appropriate strategy to minimize biologic risk.” Figs. 16 & 17_Tissue management with Viscostat. Figs. 18–21a_Gingival retraction. Fig. 21b_Final gingival retraction, occlusal view. Fig. 22a_Scanning preparations. Fig. 22b_PlanScan screenshot of scanning preparations. Fig. 20 Fig. 17Fig. 16 Fig. 22bFig. 22a Fig. 21bFig. 21a Fig. 18 Fig. 19 CAD0115_12-21_Young 02.03.15 12:38 Seite 4 CAD0115_12-21_Young 02.03.1512:38 Seite 4