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Why is this happening
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<blockquote data-quote="Sevan P" data-source="post: 209274" data-attributes="member: 7766"><p>Are you using zirconia burs to cut pmma? When u was working with a roland dwx-50 my wax and zr fit fine but my pmma I could never ever get to fit. Always had to manually adjust the inside of the crown. Now I'm working on vhf mills and have perfect drop right in milled pmma restorations. I at the time my old boss with a roland didn't want to listen to me and we reused old zr burs on wax n pmma. Now we use sierra razor sharp for all our wax pmma disks, everything is smooth as sulk.</p><p></p><p>I see this a lot when using zr bur. Diamond coated or not zr tools are only meant to cut zr.</p><p></p><p>Try getting a set of burs that are meant to cut pmma or wax. CAP should have some. If not then look into sierra tools razor sharp.</p><p></p><p>Also I have a larger cement space for pmma, my pmma setting on margin gap is .030 and my extra cement gap is .090. Where my zr and wax is .020 and .050. There is multiple factors they can effect the outcome.</p></blockquote><p></p>
[QUOTE="Sevan P, post: 209274, member: 7766"] Are you using zirconia burs to cut pmma? When u was working with a roland dwx-50 my wax and zr fit fine but my pmma I could never ever get to fit. Always had to manually adjust the inside of the crown. Now I'm working on vhf mills and have perfect drop right in milled pmma restorations. I at the time my old boss with a roland didn't want to listen to me and we reused old zr burs on wax n pmma. Now we use sierra razor sharp for all our wax pmma disks, everything is smooth as sulk. I see this a lot when using zr bur. Diamond coated or not zr tools are only meant to cut zr. Try getting a set of burs that are meant to cut pmma or wax. CAP should have some. If not then look into sierra tools razor sharp. Also I have a larger cement space for pmma, my pmma setting on margin gap is .030 and my extra cement gap is .090. Where my zr and wax is .020 and .050. There is multiple factors they can effect the outcome. [/QUOTE]
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