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Lab talk, the good, the bad, and the ugly
Dental-CAD
CAD/CAM Milling or printing night guards (ClearSplint)
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<blockquote data-quote="ztech" data-source="post: 329572" data-attributes="member: 3022"><p>Designing the splints digitally is a piece of cake. Can do a design in less than 10 min and the occlusion is usually spot on, even the excursions are accounted for correctly if the doctor provides a correct bite. The bad news is most tooling of the mills can't mill the intaglio accurate enough. This problem is in the mills that use small diameter shaft burs. PMMA is one of the toughest materials to mill and when a small shaft bur goes across the surface it deflects and looses some of the accuracy. I mill zirconia and wax with .045 spacer with a perfect fit and if I mill a provisional I use .12 to get them close enough that I don't have to literally re-mill the intaglio. I have an AG machine and the final bur for PMMA is 1.0mm but the shaft of the bur is .94mm and that diameter is carried 16mm from the tip before it starts getting larger. So my advice is, get a machine that has hefty shafts on the burs if you want to make a living milling PMMA.</p></blockquote><p></p>
[QUOTE="ztech, post: 329572, member: 3022"] Designing the splints digitally is a piece of cake. Can do a design in less than 10 min and the occlusion is usually spot on, even the excursions are accounted for correctly if the doctor provides a correct bite. The bad news is most tooling of the mills can't mill the intaglio accurate enough. This problem is in the mills that use small diameter shaft burs. PMMA is one of the toughest materials to mill and when a small shaft bur goes across the surface it deflects and looses some of the accuracy. I mill zirconia and wax with .045 spacer with a perfect fit and if I mill a provisional I use .12 to get them close enough that I don't have to literally re-mill the intaglio. I have an AG machine and the final bur for PMMA is 1.0mm but the shaft of the bur is .94mm and that diameter is carried 16mm from the tip before it starts getting larger. So my advice is, get a machine that has hefty shafts on the burs if you want to make a living milling PMMA. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
CAD/CAM Milling or printing night guards (ClearSplint)
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