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Lab talk, the good, the bad, and the ugly
Dental-CAD
3 Shape Version 2016.1.0
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<blockquote data-quote="CoolHandLuke" data-source="post: 231939" data-attributes="member: 4850"><p>well, lets use our noggins here.</p><p></p><p>each scan is +- some microns. the arch scan is usually a 'rough' 20um scan and dies are where your single digit micron accuracy come into play.</p><p></p><p>2 scans +- 20 um means a bite that may be overclosed as much as 40um on the worst day. </p><p></p><p>add to that, your magnetically attached plates are always 10-15um of not making contact because of either junk on the plates or you know, the fact that objects not in a vacuum dont truly ever touch, and your 40um becomes 70um.</p><p></p><p>that is assuming you even have a bite that is supposed to have 0um clearance. most people use 1-2 thickness of bite paper (total 350um.)</p><p></p><p>so the fact you are overclosed by between 40-70 um is worrisome.</p><p></p><p>the fact 3shape doesnt bother accounting for any of this is also one of the reasons ive never bothered to get anything more than an d800.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 231939, member: 4850"] well, lets use our noggins here. each scan is +- some microns. the arch scan is usually a 'rough' 20um scan and dies are where your single digit micron accuracy come into play. 2 scans +- 20 um means a bite that may be overclosed as much as 40um on the worst day. add to that, your magnetically attached plates are always 10-15um of not making contact because of either junk on the plates or you know, the fact that objects not in a vacuum dont truly ever touch, and your 40um becomes 70um. that is assuming you even have a bite that is supposed to have 0um clearance. most people use 1-2 thickness of bite paper (total 350um.) so the fact you are overclosed by between 40-70 um is worrisome. the fact 3shape doesnt bother accounting for any of this is also one of the reasons ive never bothered to get anything more than an d800. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
3 Shape Version 2016.1.0
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