J Korean Acad Prosthodont.  2016 Jul;54(3):210-217. 10.4047/jkap.2016.54.3.210.

Evaluation of marginal and internal gap under model-free monolithic zirconia restoration fabricated by digital intraoral scanner

Affiliations
  • 1Department of Prosthodontics, Ewha Womans University Mokdong Hospital, Seoul, Republic of Korea.
  • 2Department of Prosthodontics and Dental Research Institute, Seoul National University Gwanak Dental Hospital, Seoul, Republic of Korea. jimarn@gmail.com

Abstract

PURPOSE
The aim of this study was to evaluate the marginal and internal adaptation of monolithic zirconia restoration made without physical model by digital intraoral scanner.
MATERIALS AND METHODS
A prospective clinical trial was performed on 11 restorations as a pilot study. The monolithic zirconia restorations were fabricated after digital intraoral impression taking by intraoral scanner (TRIOS, 3shape, Copenhagen, Denmark), computer-aided designing, and milling manufacturing process. Completed zirconia crowns were tried in the patients' mouth and a replica technique was used to acquire the crown-abutment replica. The absolute marginal discrepancy, marginal gap, and internal gap of axial, line angle, and occlusal part were measured after sectioning the replica in the mesiodistal and buccolingual direction. Statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U test (α=.05).
RESULTS
From the adaptation analysis by replica, the statistically significant difference was not found between mesiodistal and buccolingual sections (P>.05), but there was significant difference among the measurement location (P<.01). The amount of absolute marginal discrepancy was larger than those of marginal gap and internal gap (P<.01).
CONCLUSION
Within the limitations of this study, the adaptation accuracy of model-free monolithic zirconia restoration fabricated by intraoral scanner exhibited clinically acceptable result. However, the margin of zirconia crown showed tendency of overcontour and cautious clinical application and follow up is necessary.

Keyword

Intra-oral scanner; Computer aided design-computer aided manufacturing (CAD-CAM); Model-free prosthesis; Replica technique

MeSH Terms

Computer-Aided Design
Crowns
Follow-Up Studies
Mouth
Pilot Projects
Prospective Studies
Replica Techniques
Full Text Links
  • JKAP
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2022 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr