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Lab talk, the good, the bad, and the ugly
Zirconium
Connector Height using Zirconia
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<blockquote data-quote="CoolHandLuke" data-source="post: 184304" data-attributes="member: 4850"><p>when i were but a wee berne in the land of zirconia it was explained to me as follows:</p><p></p><p>the strength of zirconia is in its height not its width, because of the way the crystals stack in the sintering process. they stack parallel to the plane of occlusion (perpendicular to the direction of applied masticatory force). like cordwood. so more height always means more strength, even if its not very wide.</p><p></p><p>now, i have also found that to not necessarily be true for all designs of bridge. for example in the anterior region the connector between a lateral and incisor will be Triangle shaped, due to the narrowness near the incisal proximal contact area. leaving the connector thin in this area creates a weak spot, like the pointy part of a teardrop or the tail of a comma. the bridge will be prone to shearing even if you make the wide end of the connector over 12mm sq. this happened to me in January 2014, and we didnt realize what was going on until the 5th remake. it kept shearing in the sintering oven.</p><p></p><p>so there is a minimum Width to obey, and with that i typically try to keep all connectors around 9-12mm sq. and shaped as evenly as possible.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 184304, member: 4850"] when i were but a wee berne in the land of zirconia it was explained to me as follows: the strength of zirconia is in its height not its width, because of the way the crystals stack in the sintering process. they stack parallel to the plane of occlusion (perpendicular to the direction of applied masticatory force). like cordwood. so more height always means more strength, even if its not very wide. now, i have also found that to not necessarily be true for all designs of bridge. for example in the anterior region the connector between a lateral and incisor will be Triangle shaped, due to the narrowness near the incisal proximal contact area. leaving the connector thin in this area creates a weak spot, like the pointy part of a teardrop or the tail of a comma. the bridge will be prone to shearing even if you make the wide end of the connector over 12mm sq. this happened to me in January 2014, and we didnt realize what was going on until the 5th remake. it kept shearing in the sintering oven. so there is a minimum Width to obey, and with that i typically try to keep all connectors around 9-12mm sq. and shaped as evenly as possible. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Connector Height using Zirconia
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