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Indian Journal of Forensic Medicine & Toxicology
Year : 2019, Volume : 13, Issue : 3
First page : ( 224) Last page : ( 229)
Print ISSN : 0973-9122. Online ISSN : 0973-9130.
Article DOI : 10.5958/0973-9130.2019.00200.7

Evaluation of the Marginal and Internal Fitness of Monolithic CAD/CAM Zirconia Crowns Using Two Software Design and Different Open System Milling Machines

AL-Haideri Huda H1,*, Ibraheem Adel F1

1Department of Conservative and Cosmetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, Iraq

*Corresponding author: Huda H AL-Haideri. Department of Conservative and Cosmetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, Iraq

Online published on 17 July, 2019.

Abstract

Objective

This in vitro study evaluated the marginal and internal fitness of the monolithic zirconia crowns using one digital intraoral scanner, two different in-lab software design and four different open system milling machines. Sixty-four upper first human premolars were prepared for full anatomical crowns and milled from zirconia blank divided into four groups (n=16) based on the milling machines used as follows: Group A-Sirona in-lab MC X5, Group B-imes-icore CORiTEC 250i, Group C-Charlydental CD 05-S, and Group D-Roland DWX-51D. Each group then divided into two subgroups (n=8) based on the CAD software used: Exocad and 3-Shape in-lab system software design. The marginal and internal fitness of the crowns was evaluated by direct measurement of the cement thickness through the sectioning procedure. The data were analyzed using Two-way ANOVA test. The result of this study revealed that within both software design used in all groups, no significant difference was found in the marginal gap area of the crown (p > 0.05), However, the crown did show a highly significant difference in the internal gap area (p < 0.01). As a conclusion, Exocad software design and Roland DWX-51D produce a more accurate adaptation of the zirconia crowns.

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Keywords

CAD/CAM. Marginal gap. Internal fitness. Milling. Software. Design.

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