J Adv Prosthodont.  2013 May;5(2):118-125. 10.4047/jap.2013.5.2.118.

Effect of span length on the fit of zirconia framework fabricated using CAD/CAM system

Affiliations
  • 1Postgraduate School of Clinical Dentistry, Institute for Clinical Dental Research, Korea University, Seoul, Republic of Korea. swshin@korea.ac.kr

Abstract

PURPOSE
The purpose of this study was to evaluate the effect of the span length on the fit of zirconia framework fabricated using CAD/CAM system.
MATERIALS AND METHODS
Abutments for single, 4-unit and 6-unit fixed partial prostheses were fabricated. Ten zirconia frameworks were fabricated for each group. The marginal and internal gap were presented by means of replica technique and measured by measuring microscope (AXIO(R), Carl Zeiss, Rochester, NY) and software (I-solution(R), IMT i-solution Inc., Vancouver, BC, Canada). The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (alpha=.05).
RESULTS
There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section). In some marginal reference points of 6-unit group (P<.05), the marginal gap were larger than 120 microm.
CONCLUSION
Span length of zirconia core may have an influence on marginal and internal fit. Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

Keyword

Zirconia; CAD/CAM; Span length; Fit

MeSH Terms

Denture, Partial, Fixed
Multivariate Analysis
Prostheses and Implants
Replica Techniques
Zirconium
Surveys and Questionnaires
Zirconium

Figure

  • Fig. 1 Titanium master model fabricated using CAD/CAM (Addtech Co., Seoul, Korea). A: single, B: 4-unit, C: 6-unit.

  • Fig. 2 Duplicated master models with dental stone. A: single, B: 4-unit, C: 6-unit.

  • Fig. 3 Zirconia cores fabricated using CAD/CAM (Orapix, Seoul, Korea). A: single, B: 4-unit, C: 6-unit.

  • Fig. 4 Reference points to measure the thickness of fit checker (Left: mesio-distal, Right: labio-lingual).

  • Fig. 5 Directions and positions of section of replica materials (Left: directions of labio-lingual and mesiodistal section, Right: view of labio-lingual section).

  • Fig. 6 Measurement of thickness of Fit checker® at each reference point (A: labial reference point, B: incisalreference point, C: marginal reference point, D: lingual reference point).


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