Zusammenfassung
Objectives: To investigate the edge force of CAD/CAM materials as a function of (a) material, (b) thickness, and (c) distance from the margin. Methods: Materials intended for processing with CAD/CAM were investigated: eight resin composites, one resin-infiltrated ceramic, and a clinically proven lithiumdisilicate ceramic (reference). To measure edge force (that is, load to failure/crack), plates ...
Zusammenfassung
Objectives: To investigate the edge force of CAD/CAM materials as a function of (a) material, (b) thickness, and (c) distance from the margin. Methods: Materials intended for processing with CAD/CAM were investigated: eight resin composites, one resin-infiltrated ceramic, and a clinically proven lithiumdisilicate ceramic (reference). To measure edge force (that is, load to failure/crack), plates (d=1 mm) were fixed and loaded with a Vickers diamond indenter (1 mm/min, Zwick 1446) at a distance of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm from the edge. Edge force was defined as a loading force at a distance of 0.5 mm. The type of failure was determined. To investigate the influence of the thickness, all data were determined on 1-mm and 2-mm plates. To test the influence of bonding and an underlying dentin, individual 1-mm plates were bonded to a 1-mm-thick dentin-like (concerning modulus of elasticity) resin composite. Results: For the 1-mm plates, edge force varied between 64.4 +/- 24.2 N (Shofu Block HC) and 183.2 +/- 63.3 N (ceramic reference), with significant (p <= 0.001) differences between the materials. For the 2-mm plates, values between 129.2 +/- 32.5 N (Lava Ultimate) and 230.3 +/- 67.5 N (Cerasmart) were found. Statistical comparison revealed no significant differences (p>0.109) between the materials. Brilliant Crios (p=0.023), Enamic (p=0.000), Shofu Blocks HC (p=0.009), and Grandio Bloc (p=0.002) showed significantly different edge force between the 1-mm-and 2-mm-thick plates. The failure pattern was either cracking, (severe) chipping, or fracture. Conclusions: Material, material thickness, and distance from the edge impact the edge force of CAD/CAM materials.
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