1Department of Prosthodontic, College of Dentistry, University of Kufa, Najaf, Iraq
2Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
3Department of Prosthodontic, College of Dentistry, University of Kufa, Najaf, Iraq
4Department of Pharmacology, Al-Kafeel University College, Iraq
5Research Center for Caries Prevention, Dentistry Research Institute, Department of Community Oral Health, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
*Corresponding author: F. Farid, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran E-mail: f.farid@yahoo.com
Online published on 30 April, 2019.
Surface roughness influences the marginal and internal adaptation of the prosthesis. It also can affect the accuracy of scanned data in CAD/CAM techniques.
Present study compared surface roughness of a stone and a polyurethane die material.
An identical aluminum model in form of prepared premolar was made using CNC milling machine. Poly vinylsiloxane impressions were made from the model. Half of the impressions were poured with type IV stone and the other half with the exacto-form resin die material. Surface roughness of each die was measured by profilometer. The data were analyzed with ANOVA and Tukey's test at 95% level of confidence (p=0.05).
The mean value of surface roughness for stone die material was 1.79529, and for exacto-form was. 89414μm. The difference was significant.
The surface of Exacto-form poly urethane dies is less rough in comparison with stone dies.
Die materials, Dental models, surface roughness-scanning, Dental Scanners
