J Adv Prosthodont.  2011 Dec;3(4):196-203. 10.4047/jap.2011.3.4.196.

A comparison of marginal fit of glass infiltrated alumina copings fabricated using two different techniques and the effect of firing cycles over them

• Bhowmik H
• Parkhedkar R

• KMID: 2054754
• DOI: http://doi.org/10.4047/jap.2011.3.4.196

Abstract

PURPOSE
This study evaluated marginal fit of glass infiltrated alumina cores fabricated using two techniques and their marginal stability after firing cycles of veneering porcelain.
MATERIALS AND METHODS
Fifteen standardized all-ceramic crowns were fabricated on a metal die using each technique: slip cast technique of VITA In-Ceram sprint Alumina (Group A as control) and plastic foil matrix technique of Turkom-Cera fused alumina core system (Group B). Copings were compared between groups and within groups at coping stage and after firing each layer of veneering porcelain. A device was used to standardize seating of copings on the metal die and positioning of the specimens under the microscope after each stage of fabrication. The specimens were not cemented and marginal gap was measured using an image analyzing software (Imagepro Express) on the photographs captured under an optical microscope. Two tailed unpaired 't test' was used to compare marginal gaps in two groups and one way ANOVA was used to analyze marginal distortion within each group at 95% confidence interval.
RESULTS
The marginal gap was smaller at the coping stage in group B (60 + 30 microm) than group A (81 + 21 microm) with statistical significance. After firing of veneering porcelain the difference was insignificant. At the final stage, both groups exhibited lower mean marginal gaps than at the initial coping stage with the difference of 11.75 microm for group A and 11.94 microm for group B, but it was statistically insignificant due to high value of standard deviation.
CONCLUSION
Within the limitations of this study, it was concluded that both techniques produced copings with comparable and acceptable marginal fit and marginal stability on firing veneering porcelain.

Keyword

Marginal gap; Firing cycle; Plastic foil matrix technique; All ceramic; Image analyzer

MeSH Terms

Aluminum Oxide
Crowns
Dental Porcelain
Fires
Glass
Plastics
Aluminum Oxide
Dental Porcelain
Plastics

Figure

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  Fig. 1 Schematic diagram of metallic die and coping configurations.

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  Fig. 2 Schematic diagram of metallic counter dies for porcelain buildup; A: base dentine, B: dentine and C: enamel.

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  Fig. 3 Magnetic die orientation device and its placement under the microscope.

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  Fig. 4 Tracing of die and coping margins with image analyzing software.

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  Fig. 5 Correction of rotated image with the image analyzer.

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  Fig. 6 Photographs captured at different focus level of same marginal area for superimposition.

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  Fig. 7 Mean marginal gap in group A and B in four stages of fabrication.

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