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Lab talk, the good, the bad, and the ugly
Metal
Titanium
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<blockquote data-quote="trimmerman" data-source="post: 22924" data-attributes="member: 1168"><p>I work at B&D Dental we mill Noble Titan Titanium a grade 5 Titanium for copings and full contour restorations on our Origin mills everyday. This grade of Titanium is the same that they use for implants it is an 85% which makes it stronger than the more pure stuff. There have been way to many delamination problems in the past with cast Titanium. This is due to the metal always being overheated when it is cast. Titanium is overheated when heated above 880 degrees Celcius. this causes the metal to go through a chemical reaction which changes the metal. This is one thing that causes the porcelain to delaminate. By milling Titanium this problem has been overcome. We also use a great porcelain called Triceram it is manufactured in Germany by the company Dentaurum. Triceram is a low fusing synthetic porcelain that is easy to handle and looks great. We have been using it for about a year now with out any issues like bubbles, cracks, delamination etc. </p><p>the only difference in using milled Titanium compared to Traditional PFMs are that you do not have a degas firing. but you do have a powder or paste bonder fired on before you opaque so number of firing cycles are the same. you also process the metal a little differently. instead of going directly to the degas or opaque after sandblasting and cleaning the copings you let the copings sit in the open air on the counter top for 10-30 minutes to create and oxide layer. This layer is not visible to the naked eye, but doing this step helps to create the necessary bond strength with the porcelain. Now if you let the clean copings sit out longer than 30 min you will need to sandblast and clean them again with a steamer then let them sit again for 10 minutes in the open air. The porcelain is very reasonalbly priced at $31.50 for a 15g bottle $74.50 for a 40g bottle. We sell the coping for $25 a unit if you send us a file from your open arch scanner (STL File) or $45 a unit if you send models for us to scan, design and mill.</p><p>The Titanium insurance code from the ADA is D2794. the ADA classifies Titanium between noble and high noble alloy as long as it is contains at least85% Titanium which allows the dentists to use the above code for billing. Many insurance companies will pay HN rates for Titanium and others pay just higher than Noble rates. </p><p></p><p>Tilite from Talladium does not count as Titanium it is a non precious (Base metal) alloy but it is a great one at that.</p><p></p><p>We have swithed all of our PFMs over to PFTs or PFZs. </p><p></p><p>We do separate all the Titanium finshing burs from the other material like zirconia or all porcelain CAD material burs just like you should for the differnent materials that you use in your lab. although we do use the same porcelain ovens interchangeably with different materials without any issues. If you do decide to use one porcelain oven dedicated to Titanium you should make sure that you run a high degree cycle one or twice a week to burn out any contaminates. contaminates will build up if you only use low fusing cycles all the time. but as long as you use a higher temp cycle every now and again your oven will be fine. Oh and you don't need to worry about having and inert atmosphere when firing the porcelain on Titanium that is only necessary when casting Titanium.</p><p></p><p>I hope this helps</p></blockquote><p></p>
[QUOTE="trimmerman, post: 22924, member: 1168"] I work at B&D Dental we mill Noble Titan Titanium a grade 5 Titanium for copings and full contour restorations on our Origin mills everyday. This grade of Titanium is the same that they use for implants it is an 85% which makes it stronger than the more pure stuff. There have been way to many delamination problems in the past with cast Titanium. This is due to the metal always being overheated when it is cast. Titanium is overheated when heated above 880 degrees Celcius. this causes the metal to go through a chemical reaction which changes the metal. This is one thing that causes the porcelain to delaminate. By milling Titanium this problem has been overcome. We also use a great porcelain called Triceram it is manufactured in Germany by the company Dentaurum. Triceram is a low fusing synthetic porcelain that is easy to handle and looks great. We have been using it for about a year now with out any issues like bubbles, cracks, delamination etc. the only difference in using milled Titanium compared to Traditional PFMs are that you do not have a degas firing. but you do have a powder or paste bonder fired on before you opaque so number of firing cycles are the same. you also process the metal a little differently. instead of going directly to the degas or opaque after sandblasting and cleaning the copings you let the copings sit in the open air on the counter top for 10-30 minutes to create and oxide layer. This layer is not visible to the naked eye, but doing this step helps to create the necessary bond strength with the porcelain. Now if you let the clean copings sit out longer than 30 min you will need to sandblast and clean them again with a steamer then let them sit again for 10 minutes in the open air. The porcelain is very reasonalbly priced at $31.50 for a 15g bottle $74.50 for a 40g bottle. We sell the coping for $25 a unit if you send us a file from your open arch scanner (STL File) or $45 a unit if you send models for us to scan, design and mill. The Titanium insurance code from the ADA is D2794. the ADA classifies Titanium between noble and high noble alloy as long as it is contains at least85% Titanium which allows the dentists to use the above code for billing. Many insurance companies will pay HN rates for Titanium and others pay just higher than Noble rates. Tilite from Talladium does not count as Titanium it is a non precious (Base metal) alloy but it is a great one at that. We have swithed all of our PFMs over to PFTs or PFZs. We do separate all the Titanium finshing burs from the other material like zirconia or all porcelain CAD material burs just like you should for the differnent materials that you use in your lab. although we do use the same porcelain ovens interchangeably with different materials without any issues. If you do decide to use one porcelain oven dedicated to Titanium you should make sure that you run a high degree cycle one or twice a week to burn out any contaminates. contaminates will build up if you only use low fusing cycles all the time. but as long as you use a higher temp cycle every now and again your oven will be fine. Oh and you don't need to worry about having and inert atmosphere when firing the porcelain on Titanium that is only necessary when casting Titanium. I hope this helps [/QUOTE]
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