Panoramic/Tomography

[Rejane Faria Ribeiro-Rotta]

Talking about panoramic as a tomographic technique, in the discussion about the
"hidden caries" I would like to point another issue to get the Oralisters'
comments:

What should be the proper designation to the panoramic technique:  tomography,
zonography or a technique which uses tomographic principles, or...?
Is there any other more recent proposal of standardization than that from 1963
(National Bureau of Standards Handbook 89: Methods of Evaluating Radiological
Equipment and Materials Measurements of the characteristics of body-section
radiographic equipmentand material. Measurements of the characteristics of
body-section radiographic equipment. U.S. Government Printing Office,
Washington, D.C., 1963)

"...In an effort to resolve the problem created by the varied terminology for
multiple techniques (roentgenograms, planigraphy, laminagraph...), all of which
employed the same base principle, the International Commission of Radiological
Units and Standards appointed a committee in 1962 to select a single generic
term to represent this general method.....After considerable deliberation, they
selected the term tomogram to represent a radiography of a body-section and,
hence, the term, "tomography" is now considered to be the proper designation to
describe this general technique. The term zonography is continuing to represent
" thick section tomography" employing narrow angle obscuring movements usually
below 10 degrees." .... (from Littleton, J. Tomography: Physical pricniples and
Clinical applications, 1989, based on 1963 publication)

I would appreciate your comments and references

Sincerely

Rejane

*******************************************************
Rejane Faria Ribeiro-Rotta, DDS, MS, Phd
School of Dentistry, Dept. of Oral Medicine
Federal University of Goias, Brazil

Ronnie Sim gravada:

> "Fortuitous Happenstance" would also include proper (or improper) patient
> (or more precisely tooth) positioning. These days there are so many
> different dental panoramic machines, producing these curved tomographs, one
> cannot be precisely sure what produced the differences in pixel formation
> leading to this aforesaid  diagnosis of dental caries.
> ----- Original Message -----
> From: "Byron Benson" <BBenson at TAMBCD.EDU>
> To: <ORADLIST at listserv.ucla.edu>
> Sent: Tuesday, October 16, 2001 5:11 AM
> Subject: Re: Hidden caries
>
> > Panoramic images are CURVED tomographs ... with extremely wide image
> layers.
> > In the molar region, it would be difficult for the entire tooth to not be
> in
> > image layer.  The curved "pantomographic" image layers have very different
> > characteristics than do flat plane conventional tomographs (vertical and
> > horizontal distortion, etc.).  The resolution of intraorals would always
> be
> > creater than in panoramics, however.  If the caries were depicted better
> on
> > the panoramic, I would assume that it was merely a fortuitous happenstance
> > due to the negative vertical angulation.
> >
> > ------------------------------------------------------------
> > Byron W. Benson, D.D.S., M.S.
> > Professor, Oral & Maxillofacial Radiology
> > Baylor College of Dentistry
> > Texas A & M University System Health Science Center
> > 3302 Gaston Avenue
> > Dallas, Texas 75246
> > Telephone: (214) 828-8393
> > Telefax: (214) 874-4551
> > Email:  Bbenson at tambcd.edu
> >
> >
> >
> > -----Original Message-----
> > From: Yang, Jie [mailto:JYANG at DENTAL.TEMPLE.EDU]
> > Sent: Friday, October 12, 2001 2:23 PM
> > To: ORADLIST at listserv.ucla.edu
> > Subject: Re: Hidden caries
> >
> >
> > Dear Ruth,
> >
> > Panoramic radiographs are tomographic imaging. If the caries lesions are
> on
> > the focal trough, they are occasionally depicted better on pantomographs
> > than intra-oral radiographs.
> >
> > Best regards.
> >
> > Jie
> > *****************************************************************
> > Jie Yang, D.M.D.,M.M.S., M.S., Dip. ABOMR
> > Assistant Professor, Division of Oral & Maxillofacial Radiology
> > Temple University School of Dentistry
> > 3223 N Broad Street
> > Philadelphia, PA 19140
> >
> > Tel. 215-707-1579
> > Fax. 215-707-3630
> > E-mail. mailto:jyang at dental.temple.edu>
> > ******************************************************************
> >
> >
> > -----Original Message-----
> > From: Ruth K. Arbuckle. [mailto:ruth.arbuckle at KODAK.COM]
> > Sent: Friday, October 12, 2001 1:32 PM
> > To: ORADLIST at listserv.ucla.edu
> > Subject: Hidden caries
> >
> >
> > From: RUTH K. ARBUCKLE
> >
> > A dentist recently sent to me a panoramic image along with intraoral
> > radiographs of the molar region from the same patient. While the panoramic
> > image clearly showed caries (I think it was in the 2nd molar) the
> intraoral
> > radiographs did not.
> >
> > Since we have ruled out the film as a problem, I am assuming that the
> > angulation technique was not correct.
> >
> > Could anyone please confirm that this makes sense?
> >
> > Thanks, Ruth Arbuckle.
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