Orthotown November 2017 - 47
generally are taken at a resolution of 600µ, or
0.6mm voxel size. For progress records, we'll
take a dental-only scan at 400µ, or 0.4mm, to
evaluate tips and torques for bracket repositions.
A 3-D volume as a progress record provides the
added benefit of not only mesial/distal tip (as in
2-D radiography), but also the ability to look
at the buccolingual angulation/torque as well.
Conclusion
As Bob Dylan sang, "For the times they
are a-changin'." Because of the additional
information and lower radiation associated with
ULD 3-D radiography, we consider it safe to
recommend its routine use for all orthodontic
patients. We would choose it for the treatment
of our own children. In fact, we believe that
soon the use of 2-D radiography will come
under fire because of the higher radiation doses
patients receive from its use.
Once orthodontists begin using this
technology, they'll begin to think about and
see cases differently. They'll no longer metaphorically or literally hold the panoramic or
lateral cephalometric radiograph up to the
fluorescent lights to guess what treatment is
indicated. With ULD CBCT as a tool in their
practices, they will have real knowledge to make
informed treatment decisions.
References
1.
Ludlow, J.B., & Koivisto, J. (2014). Dosimetry of Orthodontic
Diagnostic FOVs Using Low Dose CBCT protocol. University of
North Carolina/University of Helsinki. Charlottesville: UNC/
UH.
2.
Mah, e. a. (2011, March). Advanced Applications of Cone Beam
Computed Tomography in Orthodontics. Seminars in Orthodontics, 17(1), 57-71.
3.
Ludlow JB, Davies-Ludlow LE, & White SC. (2008). Patient
risk related to common dental radiographic examinations. J Am
Dent Assoc(139), 1237-1243.
4.
Jaju PP, P., & Jaju, S. (2015). Cone-beam computed tomography: Time to move from ALARA to ALADA. Imaging Science in
Dentistry, 45(4), 263-265.
Next up:
Using CBCT in
your practice
Drs. Jay Burton and
Jack Fisher's next
article for Orthotown
will discuss specifics
about the effective use
of CBCT technology in
your office-multiplanar
reconstruction, rendered
images and which
images are important for
treatment decisions.
orthotown.com \\ NOVEMBER 2017
47
http://www.orthotown.com
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