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Implants
broken screw head
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<blockquote data-quote="CoolHandLuke" data-source="post: 146205" data-attributes="member: 4850"><p>Ratings carry the connotation that up to this point any deformation under stress is normal, and at this point or beyond, the subject cannot withstand the applied forces.</p><p></p><p>with screws its as much a torsional force as a bending force. the longer the length of tooth on the implant, the more stress is applied to the head of the screw even during simple biting force. </p><p></p><p>so with every bite, torque and bending force is applied to the screw, the interface, and the bone. when all the forces are within acceptable levels, nothing breaks, but it is all under a load and is deforming. eventually it will break being weakened by too much force over time.</p><p></p><p>this is so often why Titanium screws are commonplace, and gold screws are not. gold bends too easily. titanium is quite a lot more dense but more tan that when subjected to force it is springy. it bounces back to its cured shape.</p><p></p><p>its probably why nobel has had such longstanding success; they simply use bigger screws.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 146205, member: 4850"] Ratings carry the connotation that up to this point any deformation under stress is normal, and at this point or beyond, the subject cannot withstand the applied forces. with screws its as much a torsional force as a bending force. the longer the length of tooth on the implant, the more stress is applied to the head of the screw even during simple biting force. so with every bite, torque and bending force is applied to the screw, the interface, and the bone. when all the forces are within acceptable levels, nothing breaks, but it is all under a load and is deforming. eventually it will break being weakened by too much force over time. this is so often why Titanium screws are commonplace, and gold screws are not. gold bends too easily. titanium is quite a lot more dense but more tan that when subjected to force it is springy. it bounces back to its cured shape. its probably why nobel has had such longstanding success; they simply use bigger screws. [/QUOTE]
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