European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
September 2011
Print ISSN:
0965-7452
Vol:
19
Issue:
3

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

Article Price
£15.00
Institution Article Price
£
Page Start
111
Page End
116
Authors
Thomas J. Donnelly, F.J Trevor Burke

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. An Audit of Shade Reproduction of Fixed Metal Ceramic Prostheses
  2. 94
  3. 98

  1. An Evidence Based Approach for the Provision of Resin-Bonded Bridgework
  2. 99
  3. 104

  1. The Influence of Storage on Dimensional Changes in Maxillary Acrylic Denture Bases and the Effect on Tooth Displacement
  2. 105
  3. 110

  1. In Vitro Failure of Crowns Produced by Two CAD/CAM Systems
  2. 111
  3. 116

  1. Splinting Effect on Posterior Implants Under Various Loading Modes: A 3D Finite Element Analysis
  2. 117
  3. 122

  1. The Effect on Cast Post Dimensions of Casting Investment and Airborne Particle Abrasion
  2. 123
  3. 130

  1. Immediate Replacement Complete Dentures: Pitfalls of Ignoring Traditional Teaching and Established Practice
  2. 131
  3. 134

  1. Acrylic Strengthened Casts for Removable Partial Denture for Occlusion Equilibration
  2. 135
  3. 136

  1. Erratum notice
  2. 137
  3. 137