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:: دوره 5، شماره 5 - ( مجموعه مقالات پروتزهای دندانی 1390 ) ::
جلد 5 شماره 5 صفحات 0-0 برگشت به فهرست نسخه ها
Effect of electric arc, gas oxygen torch and induction melting techniques on the marginal accuracy of cast base-metal and noble metal-ceramic crowns
چکیده:   (2006 مشاهده)

 Objectives

  The aim of this study was to identify the most appropriate alloy composition and melting technique by evaluating the marginal accuracy of cast metal-ceramic crowns.

  Methods

  Seventy standardised stainless-steel abutments were prepared to receive metal-ceramic crowns and were randomly divided into four alloy groups: Group 1: palladium-gold (Pd-Au), Group 2: nickel-chromium-titanium (Ni-Cr-Ti), Group 3: nickel-chromium (Ni-Cr) and Group 4: titanium (Ti). Groups 1, 2 and 3 were in turn subdivided to be melted and cast using: (a) gas oxygen torch and centrifugal casting machine (TC) or (b) induction and centrifugal casting machine (IC). Group 4 was melted and cast using electric arc and vacuum/pressure machine (EV). All of the metal-ceramic crowns were luted with glass-ionomer cement. The marginal fit was measured under an optical microscope before and after cementation using image analysis software. All data was subjected to two-way analysis of variance (ANOVA). Duncan's multiple range test was run for post-hoc comparisons. The Student's t-test was used to investigate the influence of cementation (α=0.05).

 Results

  Uncemented Pd-Au/TC samples achieved the best marginal adaptation, while the worst fit corresponded to the luted Ti/EV crowns. Pd-Au/TC, Ni-Cr and Ti restorations demonstrated significantly increased misfit after cementation.

 Conclusions

 The Ni-Cr-Ti alloy was the most predictable in terms of differences in misfit when either torch or induction was applied before or after cementation. Cemented titanium crowns exceeded the clinically acceptable limit of 120μm.

 Clinical significance

  The combination of alloy composition, melting technique, casting method and luting process influences the vertical seal of cast metal-ceramic crowns. An accurate use of the gas oxygen torch may overcome the results attained with the induction system concerning the marginal adaptation of fixed dental prostheses.


 Source: Journal of Dentistry

 Full Text

واژه‌های کلیدی: Gas oxygen torch، Induction، Vacuum-casting، Pressure-differential casting machine، Dental alloy، Marginal fit
     
نوع مطالعه: پژوهشي | موضوع مقاله: پروتزهای دندانی
دریافت: 1392/7/21 | انتشار: 1390/10/25
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Effect of electric arc, gas oxygen torch and induction melting techniques on the marginal accuracy of cast base-metal and noble metal-ceramic crowns. 1. 1390; 5 (5)

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Creative Commons License این مقاله تحت شرایط Creative Commons Attribution-NonCommercial 4.0 International License قابل بازنشر است.
دوره 5، شماره 5 - ( مجموعه مقالات پروتزهای دندانی 1390 ) برگشت به فهرست نسخه ها
جامعه اسلامی دندانپزشکان Islamic Dental Association of IRAN

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