Regarding the crown-lengthening procedure, the patient refused to have orthodontic brackets in her mouth for at least six months. Crown-lengthening techniques typically produce other problems; the procedure may expose furcations, and unfavorable root-to-crown ratio can be expected. Also, there is very limited interarch space.
Covering the molar teeth with a conventional crown will not give sufficient support to the three-unit fixed partial denture. If erupted because of the flared molar roots, force eruption in the posterior region may present proximity problems. Tipping and unfavorable axial tooth position may also preclude extrusion.
enay Canay, DDS, PhD, Professor
