European Journal of Prosthodontics and Restorative Dentistry

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September 2011
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In Vitro Failure of Crowns Produced by Two CAD/CAM Systems

Abstract - Previous laboratory studies have demonstrated satisfactory fracture resistance of all-ceramic crowns placed using a resin-composite luting material and a dentine bonding system. This study investigated the fracture resistance of teeth restored using CAD/CAM technology, namely, Zirconia Based crowns and Cerec® produced feldspathic porcelain crowns, both luted with a self adhesive resin luting material (RelyX™ Unicem Clicker™ 3M ESPE). Standardized preparations were carried out on two groups of ten sound, unrestored, maxillary premolar teeth. Ceramic crowns were constructed to have a thickness of 2mm at their midline fissure. Compressive fracture resistance was determined for each group using a Universal Testing Machine The failure modes were also examined visually and interpreted according to a chosen scale. Mean Compressive fracture resistance of 746 (147)N and 1630 (175)N were recorded for the Cerec® and Lava™ groups respectively; differences were statistically significant (p<0.001). The fracture resistance of teeth restored with Lava™ crowns is significantly greater than a similar group of teeth restored with Cerec® crowns.

KEY WORDS: All-ceramic, Self adhesively luted, CAD/CAM, Compressive failure

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Thomas J. Donnelly, F.J Trevor Burke

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  1. An Audit of Shade Reproduction of Fixed Metal Ceramic Prostheses
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  1. An Evidence Based Approach for the Provision of Resin-Bonded Bridgework
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  1. The Influence of Storage on Dimensional Changes in Maxillary Acrylic Denture Bases and the Effect on Tooth Displacement
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  1. In Vitro Failure of Crowns Produced by Two CAD/CAM Systems
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  1. The Effect on Cast Post Dimensions of Casting Investment and Airborne Particle Abrasion
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  1. Immediate Replacement Complete Dentures: Pitfalls of Ignoring Traditional Teaching and Established Practice
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  1. Acrylic Strengthened Casts for Removable Partial Denture for Occlusion Equilibration
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  1. Erratum notice
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  3. 137