A 57-year-old man has multiple restoration. There was a fistula mesiobuccal to #11 a year ago (Fig.1,2). There is acute apical infection lately. The pulp is non-vital. Apex locator is sensitive. Two PAs are taken with #15 file at 29 mm and 33 mm (Fig.3,4). The canal is debrided until #40 hand file. The master cone with length of 28 mm is inserted below the landmark (Fig.5). Panoramic X-ray is taken for final confirmation (Fig.6).
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Xin Wei, DDS, PhD, MS 1st edition 12/04/2016, last revision 12/04/2016