J Adv Prosthodont.  2015 Jun;7(3):233-239. 10.4047/jap.2015.7.3.233.

The effect of various veneering techniques on the marginal fit of zirconia copings

• Torabi K
• Vojdani M
• Giti R
• Taghva M
• Pardis S

• KMID: 2284709
• DOI: http://doi.org/10.4047/jap.2015.7.3.233

Abstract

PURPOSE
This study aimed to evaluate the fit of zirconia ceramics before and after veneering, using 3 different veneering processes (layering, press-over, and CAD-on techniques).
MATERIALS AND METHODS
Thirty standardized zirconia CAD/CAM frameworks were constructed and divided into three groups of 10 each. The first group was veneered using the traditional layering technique. Press-over and CAD-on techniques were used to veneer second and third groups. The marginal gap of specimens was measured before and after veneering process at 18 sites on the master die using a digital microscope. Paired t-test was used to evaluate mean marginal gap changes. One-way ANOVA and post hoc tests were also employed for comparison among 3 groups (alpha=.05).
RESULTS
Marginal gap of 3 groups was increased after porcelain veneering. The mean marginal gap values after veneering in the layering group (63.06 microm) was higher than press-over (50.64 microm) and CAD-on (51.50 microm) veneered groups (P<.001).
CONCLUSION
Three veneering methods altered the marginal fit of zirconia copings. Conventional layering technique increased the marginal gap of zirconia framework more than pressing and CAD-on techniques. All ceramic crowns made through three different veneering methods revealed clinically acceptable marginal fit.

Keyword

Marginal fit; CAD/CAM; Zirconia; Layering; Press-over; CAD-on

MeSH Terms

Ceramics
Crowns
Dental Porcelain
Ceramics
Dental Porcelain

Figure

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  Fig. 1 Brass master die.

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  Fig. 2 Fabricated zirconia CAD/CAM coping.

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  Fig. 3 The holding device used for the same positioning of specimens during measurements.

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  Fig. 4 Microscopic image of coping-die interface at ×230 magnification (zirconia coping (a), metallic die (b), marginal gap (c)).

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  Fig. 5 Fabricated zirconia CAD/CAM crown.

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