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Lab talk, the good, the bad, and the ugly
Dental-CAD
Stress Breakers, Direction Changer ETc
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<blockquote data-quote="CoolHandLuke" data-source="post: 264556" data-attributes="member: 4850"><p>regarding the span of zirconia, you are limited. very much so.</p><p></p><p>the more Compressive mpa you have the more rigid your structure is. the more rigid it is, the less room you have to use in a 3point bending scenario. </p><p></p><p>i'll tell you i just finished a 4point bending analysis of a bunch of different materials for a thing i'm doing, and zirconia did not flex more than .4mm before catastrophic failure. boom. big badaboom. huge compressive force required between to narrow points or small compressive force between two points far apart.</p><p></p><p>the longer your span, the easier it breaks.</p><p></p><p>so most manufacturers only indicate 2 pontics.</p><p></p><p>you have 4 pontics.</p><p></p><p>AND you have a stressbreaker in one of them.</p><p></p><p>this case will be ridiculously easy to break and fail. glad to hear you accept no liability. but seriously rethink making a bridge this big in the future.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 264556, member: 4850"] regarding the span of zirconia, you are limited. very much so. the more Compressive mpa you have the more rigid your structure is. the more rigid it is, the less room you have to use in a 3point bending scenario. i'll tell you i just finished a 4point bending analysis of a bunch of different materials for a thing i'm doing, and zirconia did not flex more than .4mm before catastrophic failure. boom. big badaboom. huge compressive force required between to narrow points or small compressive force between two points far apart. the longer your span, the easier it breaks. so most manufacturers only indicate 2 pontics. you have 4 pontics. AND you have a stressbreaker in one of them. this case will be ridiculously easy to break and fail. glad to hear you accept no liability. but seriously rethink making a bridge this big in the future. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
Stress Breakers, Direction Changer ETc
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