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Donkey dental anatomy. Part 1: Gross and computed axial tomography examinations.

Du Toit N, Kempson SA, Dixon PM

Royal (Dick) School of Veterinary Studies, University of Edinburgh, Department of Clinical Science, Midlothian EH25 9RG, UK.

Post-mortem examination of 19 donkey skulls showed that donkeys have a greater degree of anisognathia (27% width difference between upper and lower jaws) compared to horses (23%). Teeth (n=108) were collected from 14 skulls and examined grossly and by computed axial tomography (CAT). A greater degree of peripheral enamel infolding was found in mandibular cheek teeth (CT) compared to maxillary CT (P<0.001). A significant increase in peripheral cementum from the apical region to the clinical crown was demonstrated in all CT (P<0.0001). All donkey CT had at least five pulp cavities with six pulp cavities present in the 06s and 11s. A new endodontic numbering system for equid CT has been proposed. A greater occlusal depth of secondary dentine (mm) was present in older donkeys (>16years) than in the younger (<15years) donkeys studied. Based on gross and CAT examinations, donkey dental anatomy was shown to be largely similar to that described in horses.

Published 9 May 2008 in Vet J, 176(3): 338-44.
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Articles on Dental published 9 May 2008:

Donkey dental anatomy. Part 2: Histological and scanning electron microscopic examinations.   Vet J, 176(3): 345-53.

Ten normal cheek teeth (CT) were extracted at post mortem from donkeys that died or were euthanased for humane reasons. Decalcified histology was performed on three sections (sub-occlusal, mid-tooth and pre-apical) of each tooth, and undecalcified histology undertaken on sub-occlusal sections of the same teeth. The normal histological anatomy of primary, regular and irregular secondary dentine was found to be similar to that of the horse, with no tertiary dentine present. Undecalcified ... [Abstract] [Full-text]

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Does delayed measurement affect patient reports of provider performance? Implications for performance measurement of medical assistance with tobacco cessation: A Dental PBRN study.   BMC Health Serv Res, 8(1): 100.

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Articles on Dental published 8 May 2008:

Effect of the structure of silane coupling agent on sorption characteristics of solvents by dental resin-nanocomposites.   Dent Mater.

OBJECTIVE: This work was aimed at the study of sorption characteristics of water or ethanol/water solution (75vol%/25vol%) by dental nanocomposites consisting of a Bis-GMA/TEGDMA (50/50, wt/wt) matrix and silica nanoparticles (Aerosil OX50) as filler, silanized with various silanes. The silanes used were 3-[(1,3(2)-dimethacryloyloxypropyl)-2(3)-oxycarbonylamido]propyltriethoxysilane, which is a urethane dimethacrylate silane (UDMS), 3-methacryloxypropyltrimethoxysilane (MPS), ... [Abstract] [Full-text]

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BACKGROUND: In cases when the alveolar crest is too narrow to host an implant, lateral augmentation is required. The use of autogenous bone blocks harvested from the iliac crest is often demanded. One disadvantage is the associated patient morbidity. PURPOSE: The purpose of this study was to clinically and histologically evaluate the use of morselized impacted bone allograft, a novel technique for reconstruction of the narrow alveolar crest. MATERIALS AND METHODS: Two patients with completely ... [Abstract] [Full-text]

Articles on Dental published 7 May 2008:

Automatic correspondence using the enhanced hexagonal centre-based inner search algorithm for point-based dental image registration.   Dentomaxillofac Radiol, 37(4): 185-204.

OBJECTIVES: In this paper, the enhanced hexagonal centre-based inner search (EHCBIS) algorithm, for automatic point correspondence, is proposed for dental image registration. METHODS: The presented algorithm is incorporated within a general registration scheme, which is based on extracting a set of candidate points on the reference image, finding their corresponding points in the image to be transformed (float image) using the proposed algorithm and applying a suitable geometrical ... [Abstract] [Full-text]

Articles on Dental published 5 May 2008:

Evaluation of frictional forces during dental alignment: An experimental model with 3 nonleveled brackets.   Am J Orthod Dentofacial Orthop, 133(5): 708-15.

Introduction: The aim of this in-vitro study was to evaluate the frictional forces generated by various combinations of brackets and orthodontic wires by using an experimental model with 3 nonleveled brackets to gain a better understanding of the resistance to sliding during dental alignment and leveling. Methods: Two kinds of orthodontic brackets were tested: passive self-ligating brackets and conventional twin stainless steel brackets. The following wires were tested: 3 nickel-titanium (.014, ... [Abstract] [Full-text]

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