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Lab talk, the good, the bad, and the ugly
Dental-CAD
Designing a Restoration: Free and Open Source
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<blockquote data-quote="patmo141" data-source="post: 27123" data-attributes="member: 2560"><p><strong>Select Visible</strong></p><p></p><p>My next few posts are going to be primarily about methods of finding margins. Probably the most difficult yet most important step. Might as well get it out of the way. Smooth sailing after that</p><p></p><p>Line of Sight:</p><p></p><p>If I look straight down the axis of insertion on a well prepped tooth (for cad/cam),I should be able to see the entire margin very distinctly assuming no feather edges. If your model is a die which has been ditched, the margin will be the most peripheral thing you see. In Meshlab, there is an option "select visible" where you view an object, and it selects all the vertices it can see. (pictures attached) If the model has been ditched for you (like the one Scott gave me) or if you have prepped past the height of contour so that the tooth is undercut apical to the margin, you could theoretically get the whole prep surface in one step (undercuts will be left out!). But, this is really cheating since Scott's software found the margin first. While it could work with a non pre ditched prep, what if axis of insertion is different than long axis or we are above the height of contour for an onlay...this method is going to fail. Also, the "texture (noise)" of the model hides vertices on faces that are close to parallel w/ the line of sight. Not a huge deal, but still, this is not a very robust method.</p><p>[ATTACH=full]993[/ATTACH][ATTACH=full]994[/ATTACH]</p></blockquote><p></p>
[QUOTE="patmo141, post: 27123, member: 2560"] [b]Select Visible[/b] My next few posts are going to be primarily about methods of finding margins. Probably the most difficult yet most important step. Might as well get it out of the way. Smooth sailing after that Line of Sight: If I look straight down the axis of insertion on a well prepped tooth (for cad/cam),I should be able to see the entire margin very distinctly assuming no feather edges. If your model is a die which has been ditched, the margin will be the most peripheral thing you see. In Meshlab, there is an option "select visible" where you view an object, and it selects all the vertices it can see. (pictures attached) If the model has been ditched for you (like the one Scott gave me) or if you have prepped past the height of contour so that the tooth is undercut apical to the margin, you could theoretically get the whole prep surface in one step (undercuts will be left out!). But, this is really cheating since Scott's software found the margin first. While it could work with a non pre ditched prep, what if axis of insertion is different than long axis or we are above the height of contour for an onlay...this method is going to fail. Also, the "texture (noise)" of the model hides vertices on faces that are close to parallel w/ the line of sight. Not a huge deal, but still, this is not a very robust method. [ATTACH=full]993[/ATTACH][ATTACH=full]994[/ATTACH] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
Designing a Restoration: Free and Open Source
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