We all know that unsupported enamel is generally a no-no when considering a fixed restoration.
I have a patient who had recurrent caries under a gold crown on #31. The tooth needed endo so I had the endo resident just cut off the old crown since I would be replacing it. (I had extracted #30 and would make #31 a FPD abutment) By the time I removed all the crap tooth structure, the margin is fairly subginigval in places, below where the CEJ was. I hit all the margins with a margin trimmer to remove any flimsy "lips", but upon pouring up my impression you can see that certain areas still appear unsupported, ie, less than a 90 degree angle with the axial wall. Since enamel is not involved here, do you think I'd be ok without having to bring this guy back in to modify the prep? I am not trying to hack through this case, it's just that this patient has already had some unexpected surgeries ($$$) and I'd like to avoid crown lengthening on this tooth if possible.
I have a patient who had recurrent caries under a gold crown on #31. The tooth needed endo so I had the endo resident just cut off the old crown since I would be replacing it. (I had extracted #30 and would make #31 a FPD abutment) By the time I removed all the crap tooth structure, the margin is fairly subginigval in places, below where the CEJ was. I hit all the margins with a margin trimmer to remove any flimsy "lips", but upon pouring up my impression you can see that certain areas still appear unsupported, ie, less than a 90 degree angle with the axial wall. Since enamel is not involved here, do you think I'd be ok without having to bring this guy back in to modify the prep? I am not trying to hack through this case, it's just that this patient has already had some unexpected surgeries ($$$) and I'd like to avoid crown lengthening on this tooth if possible.
