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Lab talk, the good, the bad, and the ugly
Metal
Occlusal Clearance with SP/CG Issues
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<blockquote data-quote="dmonwaxa" data-source="post: 21240" data-attributes="member: 927"><p>First off with all due respect to all parties concerned. I would not recommend hollowing the inside; too risky and too much work. I suspect Al1 is refering to the occlusal aspect of the prep. Thats the only concieveable way to achieve this, I think. Problem is this would leave a large amount of space occlusally and might the lever effect on the crown since there is no occlusal seating of the intaglio, resulting in increased chance of failure. Al1 is correct however in saying that a buildup is necessary, I agree 100%. </p><p>The doc plays a role in this also, I'm sure he is aware of alloy cost but is just being frugal. It's a dammed if you do and dammed if you dont situation because if you dont build fir porcelain support, then it would more than likely fail. I am gonna attempt to post an illustration , so cross your fingers . Its a cross section of what think is going on. Blue reprsents the die, red = crown, and yellow = cement or cement space. As you can see if the occlusal element of the intaglio is included it would act as an anti rotational element of the crown without it however it increases the rotational nature of the crown.(Fig 1) </p><p>If crown is done using lest say a Straumann ITI solid abutment and you use the burnout plastic, you can get away with having some occlusal space. The geometric design will prevent any rotation. (Fig 2)</p><p>[ATTACH=full]708[/ATTACH][ATTACH=full]709[/ATTACH]</p></blockquote><p></p>
[QUOTE="dmonwaxa, post: 21240, member: 927"] First off with all due respect to all parties concerned. I would not recommend hollowing the inside; too risky and too much work. I suspect Al1 is refering to the occlusal aspect of the prep. Thats the only concieveable way to achieve this, I think. Problem is this would leave a large amount of space occlusally and might the lever effect on the crown since there is no occlusal seating of the intaglio, resulting in increased chance of failure. Al1 is correct however in saying that a buildup is necessary, I agree 100%. The doc plays a role in this also, I'm sure he is aware of alloy cost but is just being frugal. It's a dammed if you do and dammed if you dont situation because if you dont build fir porcelain support, then it would more than likely fail. I am gonna attempt to post an illustration , so cross your fingers . Its a cross section of what think is going on. Blue reprsents the die, red = crown, and yellow = cement or cement space. As you can see if the occlusal element of the intaglio is included it would act as an anti rotational element of the crown without it however it increases the rotational nature of the crown.(Fig 1) If crown is done using lest say a Straumann ITI solid abutment and you use the burnout plastic, you can get away with having some occlusal space. The geometric design will prevent any rotation. (Fig 2) [ATTACH=full]708[/ATTACH][ATTACH=full]709[/ATTACH] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Occlusal Clearance with SP/CG Issues
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