Class II, Mod 1 RPD

[peg lateral]

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#2 is mesially rotated about 45 degrees

The other abutments (#4 and #13) are not rotated at all.

I have the desired undercuts: DB #2, MB #4, and MB #13 (with recontouring to achieve the desired undercut).

However, with #2 being rotated the way it is, what is the best way to achieve a proper path of draw for insertion and removal of the RPD since the guide place is going to be difficult to make parallel with the guide planes of the other abutments?

Would I just do a survey crown on #2? If so, how would the lab make the guide plane? Also, how would I prep the rotated tooth? I have never prepped a rotated tooth before... do you prep it to make it align with the arch, or prep it as you normally would any other tooth?

Thank you for your help, advice, comments, etc.

 

[Decan]

I'd like to know the answer/solution as well. Quick question to the OP, what is #2 occluding to the mandibular arch?

 

[peg lateral]

#2 is occluding with #31 (I do not remember exactly which part is in occlusion as I do not have the models in front of me).

After doing some reading and some long hard looking at the cast, my plan is to prep the guide plane on the mesial proximal surface like I would if the tooth was not rotated, and then extend the guide plane or (recontour) the MB line angle of the tooth to parallel the guide plane on the distal proximal surface of #4. I am planning on using wrought wire on #4 which is a bit more forgiving and flexible, and should help with the path of draw. I am still undecided on whether to use a bracing (non-retentive) clasp assembly on #2 or use the DB undercut (with the retentive clasp from the MO rest seat extending a long ways across the tooth due to the rotation.

If anyone has any other thoughts, feel free to post.