[MARMAM] New publication on Radiographic assessment of dolphin teeth

Carolina Loch Silva lochcarolina at gmail.com
Thu Aug 3 14:23:35 PDT 2017

Dear MARMAM subscribers,

 We are pleased to announce the publication of the following paper in the
current issue of Zoological Science:

*Radiographic Assessment of Dental Pathology and Abnormalities in Dolphins*

Carolina Loch, Liliane J. Grando, Maria I. Meurer, Michella Zastrow, Angela
Fernandes and Paulo C. Simões-Lopes

doi: 10.2108/zs160151


This study proposes a simple standardized method for the production of
analog X-ray images of dolphin teeth, and to explore its potential use as a
complementary technique in the evaluation of dental pathology in small
cetaceans. We investigated exposure times that produced the best results,
and whether radiographs helped in the diagnosis of macroscopic
abnormalities. Teeth of six species of dolphins (Delphinidae: T*ursiops
truncatus, Steno bredanensis, Sotalia guianensis, Delphinus sp., Stenella
coeruleoalba, *and* Stenella frontalis*) were X-rayed in an analog dental
X-ray machine operating at 70 kVp and 7 mA. Intraoral size 2 standard films
were used, and the focus—film distance was standardised at 35 cm. Those
species with smaller teeth (total length 12–20 mm) had the best results
when exposed for 0.3 seconds, while species with larger teeth (30–45 mm)
had to be exposed for 0.4 seconds for their best result. Three independent
examiners analysed all the images taken. The average pairwise percent
agreement was 73% (Fleiss' Kappa = 0.229), suggesting fair agreement
between examiners. Analog X-ray images produced were useful in
complementing the diagnosis of dental pathology and abnormalities in
dolphins, in addition to allowing the observation of internal details and
lesion depths, which would not be possible with conventional macroscopic
methods. The use of analog X-ray imaging is easily applicable to the study
of dolphin teeth, with low operating costs and simple logistics compared to
other non-destructive analytical approaches such as Micro-CT.

Full text is available at:

Or alternatively, a *pdf* can be requested at: carolina.loch at otago.ac.nz

 Best regards,


Carolina Loch Silva, PhD

Lecturer in Oral Biology

Department of Oral Sciences

Sir John Walsh Research Institute

Faculty of Dentistry, University of Otago

Dunedin 9054, New Zealand

Phone: +(64) 03 479-9255

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