Newly established histological techniques allowed preparation of undecalcified
sections of 4-6pm thickness, and undecalcified sections of 50-60pm thickness. The
current classification of equine dentine was modified, with primary, regular
secondary, irregular secondary and tertiary dentine all being categorised separately.
Previously undescribed histological features of normal and diseased equine teeth were
identified such as dentinal pearls, interglobular dentine, caries and the presence of
The normal endodontic anatomy of all 24 cheek teeth was established, with individual
pulp horns being identified using a unique numbering system. Anatomical parameters
of dentine were established for normal cheek teeth, and these were compared to those
of apieally infected cheek teeth. A decreased presence of primary and secondary
dentine, predentine and intertubular dentine was found in diseased teeth compared
with normal cheek teeth, but increased number of resting lines were present in
diseased cheek teeth.
Analysis of 50 individual apically infected cheek teeth showed anachoretic pulpitis to
be the most common aetiology, with occlusal pulp exposure often being a secondary
finding. Apical infection caused by periodontal disease or infundibular caries was
uncommon finding. Fracture patterns to the clinical crown of equine cheek teeth were
grouped, with most fractures involving the buccal pulp horns of both maxillaiy and
mandibular cheek teeth.