Since the tooth #4 and 13 are palatalized (Fig.2-4), the teeth #2 and 3 are mesialized (Fig.2 arrow).  Besides, the ridge at #30 must be atrophic due to long termed edentulism.  A small-diameter implant will be placed at #30 with premolar width (Fig.6), while the implant at #31 will be placed distal (arrow, as compared to Fig.2).

1st Molar with Premolar Width Last Next

Xin Wei, DDS, PhD, MS 1st edition 07/29/2017, last revision 04/15/2020