J Adv Prosthodont.  2014 Jun;6(3):177-184. 10.4047/jap.2014.6.3.177.

Clinical gap changes after porcelain firing cycles of zirconia fixed dentures

• Bugurman B
• Turker SB

• KMID: 2118228
• DOI: http://doi.org/10.4047/jap.2014.6.3.177

Abstract

PURPOSE
The aim of this study was to measure the changes on the marginal and internal adaptation of zirconia based anterior fixed partial dentures after the porcelain firing process.
MATERIALS AND METHODS
A total of 34 anterior fixed partial dentures using LAVA CAD/CAM system (3M ESPE, Germany) were applied. Two silicone replicas were obtained: one is obtained before porcelain firing process (initial) and the other is obtained after porcelain firing process (final), followed by the examination under a binocular stereomicroscope. Kruskal Wallis and Wilcoxon Signed Ranks tests were used for the statistical analysis (P<.05).
RESULTS
No statistically significant difference was found between initial and final marginal gap values (P>.05). At the internal gap measurements, final marginal area values (59.54 microm) were significantly lower than the initial marginal area values (68.68 microm)(P<.05). The highest and the lowest internal gap values were observed at the incisal/occlusal area and at the marginal area, respectively. In addition, lower internal gap values were obtained for canines than for central incisors, lateral incisors and premolars at the incisal area (P<.05).
CONCLUSION
The firing cycles did not affect the marginal gap of Lava CAD/CAM system, but it is controversial for the internal gap.

Keyword

Zirconia; Resin cement; Surface treatment; Marjinal gap; Internal gap

MeSH Terms

Bicuspid
Dental Porcelain*
Denture, Partial, Fixed
Dentures*
Fires*
Incisor
Resin Cements
Silicones
Telescopes
Dental Porcelain
Resin Cements
Silicones

Figure

• 

  Fig. 1 Silicone replica. Black lines indicate the intersections for specimens preparation.

• 

  Fig. 2 Stereomicroscope image of a transversal slice. a: Marginal gap measurement points, b: Axial gap measurement points, c: Icisal gap measurement points.

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  Fig. 3 (A) Marginal adaptation Type: 1 (No marginal gap), (B) Marginal adaptation Type: 2 (Marginal gap: 54.64 µm, no overcontour or undercontour). Yellow arrow indicates marginal adaptation.

• 

  Fig. 4 (A) Initial stereomicroscope image of marginal area (mean gap value: 85.16 µm), (B) Final stereomicroscope image of marginal area (mean gap value: 64.76 µm). Yellow arrow indicates the marginal gap area.

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