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Lab talk, the good, the bad, and the ugly
Dental-CAD
3 shape issues with occlusion
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<blockquote data-quote="CoolHandLuke" data-source="post: 313635" data-attributes="member: 4850"><p>In my experience this is a threefold problem.</p><p></p><p>1. It is common for triple tray impressions to distort during pour. More common than you'd think. Reconsider your pour method. Pour diestone on both sides instead of cheaper blue or plaster opposing. Pour opposing first. </p><p></p><p>2. Scanning with elastics. Its a common problem that elastics don't close the bite properly. I suggest you to soften the plstic triple tray hinge with a flame, hold it in place while the plastic sets. This is a fix for patients who don't bite properly too. Improper bites are quite common in triple trays.</p><p></p><p>3. User error. With 3shape its easy to understand how to go from start to finish so a lot of labs hire 'kids' or family who are 'good with computers' to do this work, and may not be aware of the adjustments necessary for proper bite, excursions. It is also hit and miss with dentists who love crowns that have no occlusion and are simply 'there' instead of functional. This is especially true in north america where patients tend to sue for malpractice over the slightest inconvenience.</p><p></p><p>But to answer your question directly, yes my recommendation is to use the Optimize function to help close the distance gap so that distance measurements can be done accurately. If the optimize function moves the jaws out of correct alignment though, simply cancel and move them by hand.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 313635, member: 4850"] In my experience this is a threefold problem. 1. It is common for triple tray impressions to distort during pour. More common than you'd think. Reconsider your pour method. Pour diestone on both sides instead of cheaper blue or plaster opposing. Pour opposing first. 2. Scanning with elastics. Its a common problem that elastics don't close the bite properly. I suggest you to soften the plstic triple tray hinge with a flame, hold it in place while the plastic sets. This is a fix for patients who don't bite properly too. Improper bites are quite common in triple trays. 3. User error. With 3shape its easy to understand how to go from start to finish so a lot of labs hire 'kids' or family who are 'good with computers' to do this work, and may not be aware of the adjustments necessary for proper bite, excursions. It is also hit and miss with dentists who love crowns that have no occlusion and are simply 'there' instead of functional. This is especially true in north america where patients tend to sue for malpractice over the slightest inconvenience. But to answer your question directly, yes my recommendation is to use the Optimize function to help close the distance gap so that distance measurements can be done accurately. If the optimize function moves the jaws out of correct alignment though, simply cancel and move them by hand. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
3 shape issues with occlusion
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