PMC5624146_01
Periapical radiograph, showing the complex root morphology of the maxillary first premolar suggesting the existence of three root canals.
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fig1
Based  on these findings, a diagnosis of symptomatic irreversible pulpitis was made (Figure 1).   
Radiographical confirmation of three root canals and determination of the working lengths.
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fig2
Positions of the three canal orifices were as follows: one mesiobuccal, one distobuccal and one palatinal.  The working lengths of three root canals were determined by using Raypex 5 (VDW, Munich, Germany) apex locator, and checked with a radiograph  (Figure 2).
Periapical radiograph following the obturation of the three root canals.
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fig3
The root canal treatment was completed in a single-visit appointment  (Figure 3).
PMC5624146_02
Periapical radiograph, showing the complex root morphology of the maxillary first premolar suggesting the existence of three root canals.
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fig4
No periapical lesion was found in the  radiographic examination (Figure 4).
Radiographical confirmation of the three root canals and determination of the working lengths.
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fig5
Canals were instrumented with the TF after determining their working lengths  with Raypex 5 apex locator (Figure 5).
Periapical radiograph following the obturation of the three root canals.
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fig6
The root canal therapy was completed in a single-visit appointment (Figure 6).