European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
March 2019
Print ISSN:
0965-7452
Electronic ISSN:
2396-8893
Vol:
27
Issue:
1

Fit Accuracy of Pressed and Milled Lithium Disilicate Inlays Fabricated From Conventional Impressions or a Laboratory-Based Digital Workflow

doi: 10.1922/EJPRD_01828Homsy08


Purpose: The impact of material on the adaptation of lithium disilicate inlays is poorly
documented. This in vitro study aims at comparing the fit accuracy of pressed and
milled inlays obtained from conventional impression and laboratory-based computeraided design and computer-aided manufacturing. Material and Methods: A typodont
molar was prepared for a mesio-occlusal ceramic inlay. The stone die generated from
one conventional impression was scanned once using a laboratory scanner and the
same design was used to produce 15 pressed lithium disilicate inlays from milled wax
patterns (group CIDW), and 15 inlays from lithium disilicate blanks (group CICAD) with
a 5-axis milling machine. Marginal and internal discrepancies were measured using the
replica technique. Mixed-model ANOVA was applied to assess differences according to
material and gap location at P<0.05. Results: Material and discrepancy location had a
significant effect on fit measurements. Group CIDW showed significantly smaller marginal (37.4 µm) and internal (69.2 µm) discrepancies than group CICAD (59.6 µm and
93.7 µm respectively). Marginal discrepancies were significantly smaller than internal
discrepancies within both groups. Conclusions: Pressed inlays generated from conventional impression and milled wax patterns yielded better fit accuracy than milled inlays
obtained from conventional impression and subtractive manufacturing.

Keywords
Inlay
Lithium Disilicate
CAD-CAM


Copyright ©2019 by Dennis Barber Ltd. All rights reserved.

Article Price
£15.00
Institution Article Price
£
Page Start
18
Page End
25
Authors
Dr. Foudda Homsy, Matteo Bottin, Prof. Mutlu Özcan, Zeina Majzoub

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. The Effects of Colored Pigments on the Translucency of Experimental Dental Resin Composites
  2. 3
  3. 9

  1. Evaluation of Monomer Leaching from a Resin Cement Through Dentin
  2. 10
  3. 17

  1. Fit Accuracy of Pressed and Milled Lithium Disilicate Inlays Fabricated From Conventional Impressions or a Laboratory-Based Digital Workflow
  2. 18
  3. 25

  1. Evaluation of the Internal and Marginal Discrepancies of Co-Cr Metal Copings Prepared via CAD/CAM and Conventional Casting
  2. 26
  3. 31

  1. Adequately Prepared? A Study Using an Innovative Computer Application to Measure Clinical Crown Convergence Angles Achieved by Students at a UK Dental School
  2. 32
  3. 38

  1. Clinical Performance of Nanofilled and Microhybrid Direct Composite Restorations on Endodontically Treated Teeth
  2. 39
  3. 47