The patient returns for extraction and immediate implant after 7 days of oral Amoxicillin.  There is a deep pocket mesiolingually in addition to the mesiobuccal fistula (Fig.1 <).  The metal crown and then the tooth are sectioned. The crack of the mesial root is confirmed during extraction. The coronal portion of the mesiobuccal plate is defective, corresponding to the fistula.

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Xin Wei, DDS, PhD, MS 1st edition 07/19/2013, last revision 07/19/2014