PMC4037261_01
Pre-operative radiograph where radix is not visible
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Two other radiographs with different horizontal angulations were made that showed the presence of an additional lingual root (Figures 1 and 2).
A second preoperative radiograph of tooth 46 taken with a more mesial angulation and revealing the presence of lingually located additional distal root.
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Two other radiographs with different horizontal angulations were made that showed the presence of an additional lingual root (Figures 1 and 2).
Access opening showing the distolingual orifice in the mandibular right first molar.
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Farther away from distal root canal orifice a fourth disto-lingual canal orifice was found (Figure 3).
Working-length radiograph
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The canal lengths were determined radio-graphically with K file ISO size #15 (Figure 4) and electronically with Root ZX, (J.
Master-cone radiograph
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Proper fitting of cones was evaluated by the master cone radiograph (Figure 5).
Post-obturation radiograph
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