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Case report - Scanora imaging of an unusual unerupted tooth located entirely below the inferior dental canal.
J Ir Dent Assoc. 2003;49(2):43-6.
Makdissi J, Barez R, Whaites E, Brown J.
We present an unusual case of an unerupted tooth located beneath the inferior dental
canal (IDC) seen as an incidental finding on a dental panoramic radiograph (DPR). An
unerupted premolar was identified on the DPR lying horizontally and located entirely
below the inferior dental canal in the first and second molar region. The crown was
distally orientated and was somewhat demineralised. As this unerupted tooth appeared
to have an intimate relationship with the inferior dental canal, which in turn had a
close relationship with the distal roots of the lower left first molar, this relationship
was investigated further. Spiral tomography using Soredex's Scanora unit was used to
obtain three contiguous 2 mm thick cross-sectional images of the area, which showed
the separation of the inferior dental canal from both the first molar tooth above
and the unerupted premolar. This case highlights the role of Scanora cross-sectional
imaging in establishing accurately the relationship between teeth and the inferior
dental canal and to document the unusual position of this unerupted tooth.
Analysis of digital images acquired using different phosphor storage plates (PSPs) subjected to varying reading times and storage conditions.
Dentomaxillofac Radiol. 2003 May;32(3):186-90.
Martins MG, Haiter Neto F, Whaites EJ.
OBJECTIVES: To assess, both objectively and subjectively, the effects of different
combinations of storage conditions and varying delays in reading on digital images
captured using phosphor storage plates (PSPs). METHOD: Standardized images were obtained
of an aluminium step wedge and a dry mandible in acrylic using GE 1000 and PSPs from the
Digora (Soredex) and DenOptix (Gendex) digital systems. Twelve plates from each system
were exposed and immediately scanned to produce the baseline gold standard. The plates
were re-exposed and stored using three different storage combinations, (A) ambient
temperature, (R) refrigeration and (S) low humidity, and then scanned after 6 h, 12 h,
18 h, 24 h, 48 h or 72 h. Objective analysis was carried out by pixel density
measurements and the data were analysed statistically using analysis of variance.
Subjective analysis was carried by three oral radiologists and the results were
analysed using Mann-Whitney U-test. RESULTS: For the DenOptix system there were
no differences either objectively or subjectively in the images obtained from all
the plates using different storage conditions and after varying time intervals.
For Digora, objective analysis showed loss of pixel density after 6 h using all
storage conditions. This loss of density was also evident subjectively after 6 h
on plates stored under certain storage conditions. CONCLUSION: Storage of DenOptix
PSPs for up to 72 h in different conditions does not affect the quality of the
digital images. However, there is a loss of image density within
6 h when using Digora PSPs, which may affect clinical image interpretation.
Radiographic diagnosis of root resorption in relation to orthodontics.
Br Dent J. 2001 Jan 13;190(1):16-22.
Leach HA, Ireland AJ, Whaites EJ.
The literature regarding external root resorption in relation to orthodontics
and its radiographic diagnosis is reviewed, including a summary of the more common
radiographic techniques available. Sample cases are presented which demonstrate the
need for good radiographic technique and an awareness of the limitations of certain
radiographs. A provisional diagnosis of external root resorption may
need to be confirmed by further radiographic views where appropriate.
Intra-oral ultrasound imaging of a submandibular duct calculus.
Dentomaxillofac Radiol. 1997 Jul;26(4):252-5.
Brown JE, Escudier MP, Whaites EJ, Drage NA, Ng SY.
A case is presented showing the first reported use of a small, digitally-guided,
intra-oral ultrasound probe to image a calculus in a submandibular salivary duct.
This use of intra-oral ultrasound is discussed in the context of the overall current
status of intra-oral and extra-oral ultrasound imaging. It is proposed that using a
combination of intra-oral and extra-oral probes, the whole of the salivary
apparatus may now be examined sonographically for the presence of calculi.
An evaluation of the diagnostic yield from bitewing radiographs of small approximal and occlusal carious lesions in a low prevalence sample in vitro using different film types and speeds.
Br Dent J. 1997 Jan 25;182(2):51-8.
Ricketts DN, Whaites EJ, Kidd EA, Brown JE, Wilson RF.
AIM: To compare diagnostic yield in caries diagnosis from D- and E-speed films.
DESIGN: A laboratory study. SETTING: A UK dental school between 1992 and 1994.
MATERIALS AND METHODS: 96 extracted teeth containing approximal and occlusal lesions,
but representing a low caries prevalence sample, were set in occluding dental arches.
Bitewing radiographs were taken and interpreted by 5 examiners for the presence or
absence of caries. Each examiner was also asked which film image he or she subjectively
liked best. MAIN OUTCOME MEASURES: The teeth were subsequently sectioned and
histologically examined to validate diagnostic decisions. RESULTS: For all film types
the percentage of lesions with caries histologically in dentine correctly identified
radiologically (sensitivity) was low (approximal caries 8-22%; occlusal caries 0-30%).
The number of sound dentine sites correctly identified (specificity) was high
(approximal caries 98-100%; occlusal caries 79-100%). There were no significant
differences between D- and E-speed films. Sensitivity was unaffected by each
examiner's subjective preference for a particular film. The variation in sensitivity
of diagnosis was due to differences between examiners. CONCLUSIONS:
The reluctance of many GDPs to use E-speed film because they 'do not like
the image' cannot be endorsed or supported.
Both E-speed film types examined can be recommended for use in general practice.
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