Open AccessComparison of the marginal gap of zirconia-fabricated copings generated by CAD/CAM and Copy-Milling methods
Author(s) -
Abdolhamid Alhavaz,
Ladan Jamshidy
Publication year - 2015
Publication title -
dental hypotheses
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.164
H-Index - 10
ISSN - 2155-8213
DOI - 10.4103/2155-8213.150867
Subject(s) - cubic zirconia , materials science , cad , dentistry , abutment , coping (psychology) , epoxy , molar , composite material , orthodontics , engineering drawing , medicine , engineering , structural engineering , ceramic , psychiatry
This study was conducted to compare the marginal fit of single-tooth zirconia-based copings fabricated by CAD/CAM process (Cercon; Degudent) and Copy Milling (Dentium). Materials and Methods: One in vitro prepared abutment from one mandibular molar model served as a template for replication of 40 epoxy resin (highly filled) dies, which had been taken by polyvinyl siloxane impression material. Copings were manufactured on epoxy replicas by two processes: the CAD/CAM (Cercon; Degudent) (n = 20) and the Copy-Milling (Dentium) (n = 20) processes. Four measurements were performed for each surface coping (Buccal, Lingual, Mesial, and Distal). Data were analyzed by SPSS 16 statistical software using independent t-test. Results: There was a significant difference in the marginal gap values between CAD/CAM and Copy-Milling groups (P < 0.001). The mean value of the marginal gap (SD) for CAD/CAM Copings (56.87 μm) was significantly less than that of Copy-Milling (136.12 μm) (P < 0.001). Conclusion: The marginal fit of CAD/CAM copings was better than that of Copy-Milling copings