European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
December 2017
Print ISSN:
0965-7452
Electronic ISSN:
2396-8893
Vol:
25
Issue:
4

A Measurement Protocol for the Marginal and Internal Fit of All-Ceramic Crowns

Aims: To evaluate in vitro the influence of firing on marginal and internal fit of all-ceramic milled and pressed lithium-disilicate crowns. Materials and methods: One Standardized model with 1.6mm occlusal and 1.4mm axial reduction was used to fabricate 64 crowns. Using a factorial design, eight groups of lithium disilicate ceramics (n=8) using P=press, C=CAD/CAM, M=monolithic, O=coping, V=veneered, R=as produced: PMR, PMG, POR, PVG, CMR, CMG, COR, CVG. Crowns were produced and cemented on stone dies, then embedded in clear epoxy resin and sectioned into two plains. With a digital microscope, the distance between die and crowns was measured at the occlusal and axial walls. The
horizontal/vertical fit at the finishing line of each section were measured as well. Results: For the marginal fit, the analysis shows that the influence of material and design was significant on horizontal and vertical margins, and the influence of finish was significant with horizontal but not vertical margins (p=0.09). For the internal fit, the analysis showed that the axial gap was significantly influenced by material and finish but not by design (p=0.44).
Conclusions: With a few exceptions, horizontal and vertical marginal discrepancies were below 100 µm. Additional firing increased the discrepancies.

Keywords
Veneer
Marginal Fit
Lithium-Disilicate
Pressed
CAD/CAM Monolithic

10.1922/EJPRD_01735Abdulhameed08

Article Price
£15.00
Institution Article Price
£
Page Start
193
Page End
200
Authors
Dr. Nader Abdulhameed, Jean-Francois Roulet, Prof. Chiayi Chen, Dr. Hind Hussein

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. An Investigation into the Trueness and Precision of Copy Denture Templates Produced by Rapid Prototyping and Conventional Means
  2. 186
  3. 192

  1. A Measurement Protocol for the Marginal and Internal Fit of All-Ceramic Crowns
  2. 193
  3. 200

  1. The Effect of Core and Veneering Design on the Optical Properties of Polyether Ether Ketone
  2. 201
  3. 208

  1. The Effect of Surface Preparation of Acrylic Teeth
  2. 209
  3. 218

  1. A Randomised Controlled Trial of a Universal Bonding Agent at Three Years: Self Etch vs Total Etch
  2. 220
  3. 227

  1. Adhesion and Early Colonization of S. Mutans on Lithium Disilicate Reinforced Glass-Ceramics, Monolithic Zirconia and Dual Cure Resin Cement
  2. 228
  3. 234