The effect of various veneering techniques on the marginal fit of zirconia copings.
- Author:
Kianoosh TORABI
1
;
Mahroo VOJDANI
;
Rashin GITI
;
Masumeh TAGHVA
;
Soheil PARDIS
Author Information
- Publication Type:Original Article
- Keywords: Marginal fit; CAD/CAM; Zirconia; Layering; Press-over; CAD-on
- MeSH: Ceramics; Crowns; Dental Porcelain
- From:The Journal of Advanced Prosthodontics 2015;7(3):233-239
- CountryRepublic of Korea
- Language:English
- 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.
