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  • <p>Dentists often take an x-ray to document the length of a root canal.</p><p>They'll first slide a file into the tooth to that point where they anticipate it extends to the tip of its root. They'll then take an x-ray.</p><p>The actual length of the tooth is taken from readings on the file. The x-ray just confirms that the file was positioned properly.</p><p>(The measurement markings themselves don't really show on the x-ray like we've illustrated. See our next slide to understand how they're used.)</p>
     

    Dentists often take an x-ray to document the length of a root canal.

    They'll first slide a file into the tooth to that point where they anticipate it extends to the tip of its root. They'll then take an x-ray.

    The actual length of the tooth is taken from readings on the file. The x-ray just confirms that the file was positioned properly.

    (The measurement markings themselves don't really show on the x-ray like we've illustrated. See our next slide to understand how they're used.)

  • <p>A file's measurement markings are the black bands you see next to the label "B".</p><p>After the file has been inserted into the canal, the dentist will slide the yellow stopper ("C") down the file to a reference point on the tooth (see our next slide for an illustration).</p><p>From the tip of the file to the yellow stopper is the length of the canal as documented by the x-ray.</p>
     

    A file's measurement markings are the black bands you see next to the label "B".

    After the file has been inserted into the canal, the dentist will slide the yellow stopper ("C") down the file to a reference point on the tooth (see our next slide for an illustration).

    From the tip of the file to the yellow stopper is the length of the canal as documented by the x-ray.

  • <p>This graphic shows a file positioned for a measurement x-ray.</p><p>Evidently this dentist anticipates that this canal measures about 19 1/2mm in length (that's within the norm for a lower 1st molar).</p><p>[The file is 21mm long, the stopper is just shy of the handle (by about 1/2mm), and the stopper itself measures 1mm. 21mm - 1/2mm - 1mm = 19 1/2mm ] </p>
     

    This graphic shows a file positioned for a measurement x-ray.

    Evidently this dentist anticipates that this canal measures about 19 1/2mm in length (that's within the norm for a lower 1st molar).

    [The file is 21mm long, the stopper is just shy of the handle (by about 1/2mm), and the stopper itself measures 1mm. 21mm - 1/2mm - 1mm = 19 1/2mm ]