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Lab talk, the good, the bad, and the ugly
Dental-CAM
Breakage of zirconia bridges
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<blockquote data-quote="AlienMilling" data-source="post: 215504" data-attributes="member: 14543"><p>Couple of possibilities </p><p></p><p>Bridges over 6 units </p><p></p><p><strong>Designing Parameters </strong></p><ul> <li data-xf-list-type="ul">Make sure the Zirconia Framework is designed with a minimum thickness of .8mm on the copings - 1mm full zirconia </li> <li data-xf-list-type="ul">Connectors must be 10mm² for frameworks (Broad contacts for Full Contour)</li> </ul><p></p><p><strong>Milling Parameters </strong></p><ul> <li data-xf-list-type="ul">Mill at low RPM (highest quality possible)</li> <li data-xf-list-type="ul">Mill a bar behind the bridge for sintering </li> </ul><p></p><p><strong>Post Processing </strong></p><ul> <li data-xf-list-type="ul">Handle bridge carefully </li> <li data-xf-list-type="ul">Cut it out of the block using high speed diamond burs (On Large bridges, use a new bur to avoid tugging)</li> <li data-xf-list-type="ul">smooth away connectors placements </li> <li data-xf-list-type="ul">Adjust the grooves in the proximal areas in the green state</li> <li data-xf-list-type="ul">Brush and Clean the zirconia</li> <li data-xf-list-type="ul">Ultra sonic with distilled water </li> </ul><p></p><p></p><p><strong>Sintering </strong></p><ul> <li data-xf-list-type="ul">Sinter by itself in a tray with fresh beads </li> <li data-xf-list-type="ul">Make sure to read your manufacturers sintering hours. Alien Zirconia is 8 hours</li> </ul><p></p><p><strong>After sinter </strong></p><ul> <li data-xf-list-type="ul">Seperate the bridge from the sinter bar using high speed with water cooling </li> </ul><p></p><p>If all of these steps are followed you should have almost none to very minimal fractures in the bridge.</p></blockquote><p></p>
[QUOTE="AlienMilling, post: 215504, member: 14543"] Couple of possibilities Bridges over 6 units [B]Designing Parameters [/B] [LIST] [*]Make sure the Zirconia Framework is designed with a minimum thickness of .8mm on the copings - 1mm full zirconia [*]Connectors must be 10mm² for frameworks (Broad contacts for Full Contour) [/LIST] [B]Milling Parameters [/B] [LIST] [*]Mill at low RPM (highest quality possible) [*]Mill a bar behind the bridge for sintering [/LIST] [B]Post Processing [/B] [LIST] [*]Handle bridge carefully [*]Cut it out of the block using high speed diamond burs (On Large bridges, use a new bur to avoid tugging) [*]smooth away connectors placements [*]Adjust the grooves in the proximal areas in the green state [*]Brush and Clean the zirconia [*]Ultra sonic with distilled water [/LIST] [B]Sintering [/B] [LIST] [*]Sinter by itself in a tray with fresh beads [*]Make sure to read your manufacturers sintering hours. Alien Zirconia is 8 hours [/LIST] [B]After sinter [/B] [LIST] [*]Seperate the bridge from the sinter bar using high speed with water cooling [/LIST] If all of these steps are followed you should have almost none to very minimal fractures in the bridge. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAM
Breakage of zirconia bridges
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