Today clinical class in endodontics
was conducted by Dr. Nitin Singh. The topic of discussion was “Canal
negotiation and working length determination in RCT”. The root canal anatomy of
incisors, premolars and molars was emphasized. An accurate working length
determination of root canal during endodontic treatment is very essential. It
makes endodontic treatment easier for an operator to remove necrotic tissue and
prepare canals precisely. Various methods have been used to establish correct
working length. These include use of conventional or digital radiography,
tactile method and moisture on paper point. All of these methods have their
limitations. Radiographs are subjected to distortion and magnification. It
comprises accurate location of root apices. They are technique sensitive in
exposure and interpretation. They also provide a two dimensional image of a
three dimensional structure which may not represent real position of apical
region. Furthermore, in many cases with conventional radiography, it is
difficult to establish the actual length of the canal with a two dimensional
image. It becomes even more difficult to establish correct working length with
radiography when root canal system is superimposed radiographically by anatomic
structures. In such cases, electronic method using apex locator is very useful.
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