Although there is no infection around the tooth #31 (Fig.1), there are multiple deep pockets. Infiltration is administered first. Extraction reveals that the distal root is fractured from #31. There is more gingival recession in the distobuccal area of the tooth #31, corresponding to the fracture. The tooth is mobile due to bone loss.
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Xin Wei, DDS, PhD, MS 1st edition 09/30/2014, last revision 09/30/2014