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Lab talk, the good, the bad, and the ugly
Dental-CAD
Exocad/ Dess Aurum
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<blockquote data-quote="DAL Claxton" data-source="post: 313822" data-attributes="member: 22777"><p>Hello Dima! Depending on your milling system, you can also reimport the "rhino 3d" engineer created model of the implant part. With Millbox at least, you can have the software recognize the part, cut out a more accurate representation of the base, and even make tiny adjustments to "cement gap". Even with milling as accurate as it is, any small factors can change things and could affect fit. You could have burrs that were made slightly incorrect in size from what's listed in the strategy, shrinkage rate not 100% represented (overall shrink compared to x/y/z),mill calibration off, or even burrs with inconsistent shank lenghts causing some wobbling.</p><p></p><p>On the other side of things, implant companies can have a hard time with Exocad. Some of the key words used in 3Shape like "additional spacing" are entirely different in Exocad. Additional spacing creates an offset from the entire prep or object including the margin to compensate in some part for shrinkage (defaulted with most materials to .02) if you turn this up in your advanced parameters just as a test you can see even the margin is opened by this much and the minimal thickness visualization gets warped if it's too large.</p><p></p><p>A fun trick with Exocad though: if you still create the job as a screw retained manual positioning, and scan in the case, you can avoid the inaccuracies from your scanner and scan spray by getting an engineer software created STL of the TI base.</p><p></p><p>Go to Expert mode - Tools - Add/Remove Mesh - Import that STL file as a multidie scan - and line it up like a dab die / Multi Die scan.</p><p></p><p>Just make sure that TI base STL has a closed top, if there's a screw hole then Exocad will attempt to drop the prep down through it like a post and core.</p><p></p><p>Hope this helps!</p><p>- Josh</p></blockquote><p></p>
[QUOTE="DAL Claxton, post: 313822, member: 22777"] Hello Dima! Depending on your milling system, you can also reimport the "rhino 3d" engineer created model of the implant part. With Millbox at least, you can have the software recognize the part, cut out a more accurate representation of the base, and even make tiny adjustments to "cement gap". Even with milling as accurate as it is, any small factors can change things and could affect fit. You could have burrs that were made slightly incorrect in size from what's listed in the strategy, shrinkage rate not 100% represented (overall shrink compared to x/y/z),mill calibration off, or even burrs with inconsistent shank lenghts causing some wobbling. On the other side of things, implant companies can have a hard time with Exocad. Some of the key words used in 3Shape like "additional spacing" are entirely different in Exocad. Additional spacing creates an offset from the entire prep or object including the margin to compensate in some part for shrinkage (defaulted with most materials to .02) if you turn this up in your advanced parameters just as a test you can see even the margin is opened by this much and the minimal thickness visualization gets warped if it's too large. A fun trick with Exocad though: if you still create the job as a screw retained manual positioning, and scan in the case, you can avoid the inaccuracies from your scanner and scan spray by getting an engineer software created STL of the TI base. Go to Expert mode - Tools - Add/Remove Mesh - Import that STL file as a multidie scan - and line it up like a dab die / Multi Die scan. Just make sure that TI base STL has a closed top, if there's a screw hole then Exocad will attempt to drop the prep down through it like a post and core. Hope this helps! - Josh [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
Exocad/ Dess Aurum
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