Accuracy of ceramic restorations made with two CAD/CAM systems
Hamza T.A.; Ezzat H.A.; El-Hossary M.M.K.; El Megid Katamish H.A.; Shokry T.E.; Rosenstiel S.F.
Date issued:
2013
Series Info:
Journal of Prosthetic Dentistry
109
Type:
Article
Keywords:
dental porcelain
,
IPS e.max CAD LT
,
lithia disilicate
,
stainless steel
,
yttria stabilized tetragonal zirconia
,
yttrium
,
zirconium
,
zirconium oxide
,
article
,
chemistry
,
computer aided design
,
dental procedure
,
dental surgery
,
endodontics
,
equipment
,
evaluation
,
human
,
microscopy
,
standard
,
surface property
,
tooth crown
,
tooth prosthesis
,
Computer-Aided Design
,
Crowns
,
Dental Marginal Adaptation
,
Dental Models
,
Dental Porcelain
,
Dental Prosthesis Design
,
Humans
,
Microscopy
,
Stainless Steel
,
Surface Properties
,
Tooth Preparation, Prosthodontic
,
Yttrium
,
Zirconium
Abstract:
Statement of problem Different types of CAD/CAM systems are currently available, but information regarding which system produces the best marginal fit is lacking. Purpose The purpose of this study was to evaluate the effect of 2 different CAD/CAM systems (Cerec inLab, Kavo Everest) on the marginal fit of 2 types of zirconia-based and lithium disilicate crowns. Material and methods Forty zirconia-based and lithium disilicate crowns, 20 each, were fabricated with the Cerec inLab and Everest CAD/CAM systems on a specially designed stainless steel die to ensure the standardization of specimen shape and dimensions. The vertical marginal fit for all tested crowns was evaluated by using a digital microscope at �100 magnification, and the data were tabulated and statistically analyzed with 2-way ANOVA, followed by the Tukey honestly significant difference (HSD) test with a confidence level of.05 to determine the mean differences. Results The results showed that the CAD/CAM technique, ceramic type, and their interaction had a statistically significant effect on the mean marginal fit of both ceramic types tested. Conclusions Better marginal fit values were exhibited by the Everest CAD/CAM technique for both ceramic types tested. � 2013 The Editorial Council of the Journal of Prosthetic Dentistry.
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