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The upper 2nd molar have 3 roots with limited furcation. The buccal ones may be fused (Fig.1 (CT coronal section)). After extraction, there are 2 sockets (Fig.1'). B: buccal; P: palatal: *: septum; >: thin palatal bone in this case. Because of less furcation, the septum of the 2nd molar is short. A bone-level implant should start in the septum and stop at the crest instead. The exposed threads are to be covered by bone graft
Green line in Fig.1 indicates sagittal section for Fig.2.
Xin Wei, DDS, PhD, MS 1st edition 12/28/2014, last revision 12/28/2014