J Korean Acad Prosthodont.  2011 Jul;49(3):236-244.

Marginal and internal fitness of three-unit zirconia cores fabricated using several CAD/CAM systems

Affiliations
  • 1Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, Korea.
  • 2Institute for Clinical Dental Research, Korea University, Seoul, Korea. swshin@korea.ac.kr

Abstract

PURPOSE
This study was aimed to compare the margin and internal fitness of 3-unit zirconia bridge cores fabricated by several CAD/CAM systems using replica technique.
MATERIALS AND METHODS
Three unit-bridge models in which upper canine and upper second premolar were used as abutments and upper first premolar was missed, were fabricated. Fourty models were classified into 4 groups (Cerasys(R) (Group C), Dentaim(R) (Group D), KaVo Everest(R) (Group K), Lava(TM)(Group L)), and zirconia cores were fabricated by each company. Sixteen points were measured on each abutment by replica technique. Statistical analysis was accomplished with two way ANOVA and Dunnett T3 (alpha=.05).
RESULTS
In most systems, there was a larger gap on inter margin than outer margin. In the Group K, overall fitness was excellent, but the incisal gap was very large. In the Group C, marginal gap was significantly larger than Group K, but overall internal gap was uniform (P<.05). The axial gap was under 100 microm in all system. The difference between internal and external gap was small on Group L and C. However, internal gap was significantly larger than external gap in Group D (P<.05). The fitness of canine was better than second premolar among abutments (P<.05).
CONCLUSION
The marginal and internal gap was within the clinically allowed range in all of the three systems. There was a larger gap on second premolar than canine on internal and marginal surface. In most systems, there was a larger gap on occlusal surface than axial surface.

Keyword

Marginal fitness; Internal fitness; CAD/CAM; Zirconia core

MeSH Terms

Bicuspid
Replica Techniques
Zirconium
Zirconium
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