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Implants
4-unit, 2-implant cement-retained bridge... Engaging or non-engaging abutments?
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<blockquote data-quote="JMN" data-source="post: 295725" data-attributes="member: 8469"><p>You are overcomplicating things and needlessly scarring yourself.</p><p>This bridge will be no different than a tooth borne bridge. With the exception that formthe first time in your life your bridge preps are almost exactly what and how you want them shaped if you did it instead of the doctor because you are doing the preps.</p><p></p><p>You are making custom abutments to create a path of draw/path of insertion.</p><p>In understanding when to engage or not to engage the anti-rotational features you only need to know if the abutments will be seated as individuals, not all at once. OR if they will be seated all at once.</p><p></p><p>If they are to be placed one at a time, you want engaging to prevent micro-rotation and eventual screw loosening among other things.</p><p></p><p>If the abutments are joined together and being seated as one unit and not individually you do not need tomengage the anti-rotational features as the abutment being a non-indivduated part of a non separable whole will prevent rotation of all the abutments which are part of that (sub)structure.</p><p></p><p>You *may* use one or two engaging abutments in places where all non-engaging would be fine, but it is increasing the chance that they will not all seat uniformly or even at all. An engaging abutment will require the entire restoration to be inserted following the path of insertion of that engaging abutment, which as you know allows quite little if any deviation of direction. </p><p></p><p></p><p></p><p></p><p>Yes you can use all engaging on a 7 implant screw retained bridge. But you better have the most awesome oral surgeon in history getting those implants sunk perfectly parrallel. You can use all nin-engaging on a cement retained bridge, but you'll need to produce and provide a setaing jig to let the placement dentist get them in the proper rotational timing so that the bridge will seat. It is best, however, to always use engaging when seating abutments as individuals and non-engaging when seating as a group. Much less headaches for all involved.</p><p></p><p></p><p>I hope that made sense, and helps you get a better understanding of reasons for the should/shouldn't/may/can confusion.</p></blockquote><p></p>
[QUOTE="JMN, post: 295725, member: 8469"] You are overcomplicating things and needlessly scarring yourself. This bridge will be no different than a tooth borne bridge. With the exception that formthe first time in your life your bridge preps are almost exactly what and how you want them shaped if you did it instead of the doctor because you are doing the preps. You are making custom abutments to create a path of draw/path of insertion. In understanding when to engage or not to engage the anti-rotational features you only need to know if the abutments will be seated as individuals, not all at once. OR if they will be seated all at once. If they are to be placed one at a time, you want engaging to prevent micro-rotation and eventual screw loosening among other things. If the abutments are joined together and being seated as one unit and not individually you do not need tomengage the anti-rotational features as the abutment being a non-indivduated part of a non separable whole will prevent rotation of all the abutments which are part of that (sub)structure. You *may* use one or two engaging abutments in places where all non-engaging would be fine, but it is increasing the chance that they will not all seat uniformly or even at all. An engaging abutment will require the entire restoration to be inserted following the path of insertion of that engaging abutment, which as you know allows quite little if any deviation of direction. Yes you can use all engaging on a 7 implant screw retained bridge. But you better have the most awesome oral surgeon in history getting those implants sunk perfectly parrallel. You can use all nin-engaging on a cement retained bridge, but you'll need to produce and provide a setaing jig to let the placement dentist get them in the proper rotational timing so that the bridge will seat. It is best, however, to always use engaging when seating abutments as individuals and non-engaging when seating as a group. Much less headaches for all involved. I hope that made sense, and helps you get a better understanding of reasons for the should/shouldn't/may/can confusion. [/QUOTE]
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4-unit, 2-implant cement-retained bridge... Engaging or non-engaging abutments?
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