The Journal of Advanced Prosthodontics

  • 제7권3호
  • /
  • Pages.233-239
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  • 2015
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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The effect of various veneering techniques on the marginal fit of zirconia copings

  • Torabi, Kianoosh (Department of Prosthodontics, Faculty of Dentistry, Shiraz University of Medical Sciences) ;
  • Vojdani, Mahroo (Biomaterial Research Center, Department of Prosthodontics, Faculty of Dentistry, Shiraz University of Medical Sciences) ;
  • Giti, Rashin (Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences) ;
  • Taghva, Masumeh (Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences) ;
  • Pardis, Soheil (Department of Oral and Maxillofacial Pathology, Faculty of Dentistry, Shiraz University of Medical Sciences)
  • 투고 : 2014.11.26
  • 심사 : 2015.04.13
  • 발행 : 2015.06.30
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초록

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 ($63.06{\mu}m$) was higher than press-over ($50.64{\mu}m$) and CAD-on ($51.50{\mu}m$) 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 CADon techniques. All ceramic crowns made through three different veneering methods revealed clinically acceptable marginal fit.

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