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Video Details
補綴におけるジルコニアvsメタルSubstructures

Description:
In this outstanding presentation, Dr. Stefano Gracis outlines very specific criteria for making a clinically rational selection of ceramic systems in everyday practice applications. Specifically, he discusses the state of the art in ceramic systems and the properties that must be considered in making decisions regarding their use.

Date Added:
7/24/2010

Author(s):

Stefano Gracis, DMD, MSD Stefano Gracis, DMD, MSD
Dr. Gracis received his D.M.D. degree in 1986 from the University of Pennsylvania, (Philadelphia, Pennsylvania, USA) and, in 1987, from the University of Pavia (Pavia, Italy)....
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Online Videos / Restorative / Crowns and Bridges / Zirconia vs Metal Substructures in Restorative Dentistry




Questions & Comments
Roxana Ghergari - (4/10/2017 11:04 AM)

Great presentation. Thank you!!

kutlu erdogan - (5/15/2011 4:44 AM)

Thank you Stefano very much! I think exactly the same as you do and scientific researches confirm my clinical observations... What do you think about full-zirconia crowns and bridges such as "pretau, bruxzir and so on.." It seems they are gonna solve the chipping problem. Still, they have a long way to take to achive naturally esthetic outcomes. Do you think they might be the future if the esthetic problem is solved? Thanks..

James Hastings - (7/31/2010 5:52 PM)

Excellent presentation, well-reasoned, honest, and insightful. Thank you!

enrico manca - (7/31/2010 11:22 AM)

Thanks so much dott Gracis!

niki nikolov - (7/29/2010 10:18 PM)

Just in time!

Stefano Gracis - (5/16/2010 2:20 PM)

[quote=enrico manca]THANK YOU DOTT. GRACIS FOR THIS LESSON! BUT WHAT DO YOU THINK ABOUT FEATHER EDGE PREPARATION ( HERE IN ITALY IT IS BECOMING VERY VERY COMMONLY!!) AND ZIRCONIA OR METAL CERAMIC CROWN??
THANKS
ENRICO MANCA, CAGLIARI[/quote]


Dear Enrico, I know very well how feather edge preparations, in the recent months, have been under the spotlight in Italy because of the beautiful work shown by some well known clinicians who have demonstrated how this conservative preparation design can produce nevertheless a nice esthetic outcome thanks to the use of the zirconia. In the past, the feather-edge preparation margin design demanded the fabrication of metal-ceramic crowns with visible metal margins. Thus, they could not be easily employed in the anterior region. Nowadays, zirconia, with its high strength even in thin sections and its white hue, can be used on these preparations allowing the technician to have a very esthetic result all the way to the margin. It remains to be demonstrated that, in the long run (5 years or longer), these crowns will indeed perform satisfactorily under function and that leaving ample collars of zirconia exposed to the oral environment will indeed not cause any problem to the restoration.
Lastly, I am more apt at using a horizontal type of preparation (chamfer or shoulder) on anterior teeth NOT affected by the loss of periodontal support, in association with the fabrication of crowns in metal-ceramic, glass ceramics, alumina or zirconia depending on a number of variables. However, in selected situations I can certainly see the benefit of vertical preparations provided that they are carried out in the full respect of the surrounding periodontal tissues. Yours sincerely, Stefano Gracis

enrico manca - (5/3/2010 5:00 AM)

THANK YOU DOTT. GRACIS FOR THIS LESSON! BUT WHAT DO YOU THINK ABOUT FEATHER EDGE PREPARATION ( HERE IN ITALY IT IS BECOMING VERY VERY COMMONLY!!) AND ZIRCONIA OR METAL CERAMIC CROWN?? THANKS ENRICO MANCA, CAGLIARI

Stefano Gracis - (5/16/2010 1:59 PM)

[quote=sameh barsoum]beautiful presentation and excellent work with metal ceramics. Concerning the margin design as related to distortion following firing of porcelain: that's a problem we hardly see with base metal alloys. it does happen with precious alloys even when we follow the excellent margin triangle design by M. Kuwata [/quote]


Dear Sameh, thank you for your compliments and for posing the comment. I have to say that I have no problems in believing what you are saying, but I do not use base metal alloys. At least in my experience, I find that the ceramics developed so far for such alloys do not match in beauty the ones for precious alloys. Maybe, now that CAD CAM technology is allowing base metal alloys to be milled with a high degree of precision avoiding the pitfalls of casting, the ceramic manufacturers will be stimulated to develop better ceramics for these metals especially from the esthetic point of view. Yours sincerely, Stefano Gracis

sameh barsoum - (5/3/2010 4:22 AM)

beautiful presentation and excellent work with metal ceramics. Concerning the margin design as related to distortion following firing of porcelain: that's a problem we hardly see with base metal alloys. it does happen with precious alloys even when we follow the excellent margin triangle design by M. Kuwata

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