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Lab talk, the good, the bad, and the ugly
Dental-CAM
CAD and CAM combination output differences?
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<blockquote data-quote="CoolHandLuke" data-source="post: 73350" data-attributes="member: 4850"><p>probably a lot more factors to consider than that, scott. some 1mm tools have a degree of flexibility to their shaft. sometimes people sinter their crowns with the margin up, some sinter with the occlusal up. some zirconia might be kept in a warm environment, or the tool might be heating while milling. sometimes the milling path can error out (recently we had it where the mill just would not mill using the 1mm bur, only the 2mm. same file nested in a different position cleaved in half on the second attempt. the third managed to punch a big hole in the puck as soon as the bur hit the puck. very strange)</p><p></p><p>then again, some zirconia manufacturers give expansion rates to 4 digits, and some milling machines are only capable of reading to the 3rd digit. this i think might be the biggest issue currently faced. metoxit blocks and bruxzir blocks have expansion rates 4 digits long, and my mill only accepts the first 3 digits. so i have to round off, and it can be tricky to compensate for in die spacer and contact areas.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 73350, member: 4850"] probably a lot more factors to consider than that, scott. some 1mm tools have a degree of flexibility to their shaft. sometimes people sinter their crowns with the margin up, some sinter with the occlusal up. some zirconia might be kept in a warm environment, or the tool might be heating while milling. sometimes the milling path can error out (recently we had it where the mill just would not mill using the 1mm bur, only the 2mm. same file nested in a different position cleaved in half on the second attempt. the third managed to punch a big hole in the puck as soon as the bur hit the puck. very strange) then again, some zirconia manufacturers give expansion rates to 4 digits, and some milling machines are only capable of reading to the 3rd digit. this i think might be the biggest issue currently faced. metoxit blocks and bruxzir blocks have expansion rates 4 digits long, and my mill only accepts the first 3 digits. so i have to round off, and it can be tricky to compensate for in die spacer and contact areas. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAM
CAD and CAM combination output differences?
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