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KMID : 1023820150070030233
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 3 p.233 ~ p.239
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The effect of various veneering techniques on the marginal fit of zirconia copings
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Kianoosh Torabi
Mahroo Vojdani
Rashin Giti
Masumeh Taghva
Soheil Pardis
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Abstract
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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 (α=.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 μm) was higher than press-over (50.64 μm) and CAD-on (51.50 μm) 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.
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KEYWORD
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Marginal fit, CAD/CAM, Zirconia, Layering, Press-over, CAD-on
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