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Orthodontics
Automated process to trim and finish clear aligners
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<blockquote data-quote="Teofil" data-source="post: 137090" data-attributes="member: 129"><p>Hey</p><p>I produce aligners using 3D. There are a few things you need to consider.</p><p>First of all, printed models have to have a flat base however "tiny" you print them. You can't thermoform if it's not stable or has undercuts. Since not all teeth are always at equal height their "neck lines" height also differ. You can't cut aligners following exact neck-line since every sharp angle will be a week spot and aligner will most likely break. The proper way to cut aligners is following a contour line 1mm above neck-line, with no sharp angles. </p><p>I assume you would like to automatize the part of a process after you use your pressure thermo forming machine like Biostar or similar. To do this you need 3 axis CNC mill. CNC mill "feeds"on numerical code provided by the software , i tells the burs and model holder where to move relevant to each other in space.</p><p>The main problem with this is that you can not use the same cutting path for different patient since every jaw(set of models) is unique. The cutting path is drawn in cnc router software, but you have to keep in mind that this line's position in 3D space has to be set in relation to the edge of blank thermoplastic sheet. Also because of this every 3D printed model in the whole set of models has to be set on precisely same position on the forming platform.</p><p>If you don't understand what I'm trying to say I can make you a crude drawing since my technical drawing skills are pathetic <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Teofil, post: 137090, member: 129"] Hey I produce aligners using 3D. There are a few things you need to consider. First of all, printed models have to have a flat base however "tiny" you print them. You can't thermoform if it's not stable or has undercuts. Since not all teeth are always at equal height their "neck lines" height also differ. You can't cut aligners following exact neck-line since every sharp angle will be a week spot and aligner will most likely break. The proper way to cut aligners is following a contour line 1mm above neck-line, with no sharp angles. I assume you would like to automatize the part of a process after you use your pressure thermo forming machine like Biostar or similar. To do this you need 3 axis CNC mill. CNC mill "feeds"on numerical code provided by the software , i tells the burs and model holder where to move relevant to each other in space. The main problem with this is that you can not use the same cutting path for different patient since every jaw(set of models) is unique. The cutting path is drawn in cnc router software, but you have to keep in mind that this line's position in 3D space has to be set in relation to the edge of blank thermoplastic sheet. Also because of this every 3D printed model in the whole set of models has to be set on precisely same position on the forming platform. If you don't understand what I'm trying to say I can make you a crude drawing since my technical drawing skills are pathetic :) [/QUOTE]
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Automated process to trim and finish clear aligners
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