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Image Transverse section through the skull (labelled)
This skull has been sectioned at the level of the premolars. It shows the position of the nasolacrimal duct (NLD) and the relationship of the apex of the first upper cheek tooth with the maxillary sinus. It also shows the normal occlusal relationship of the cheek teeth with the lingual edges of the maxillary teeth resting against the buccal edges of the mandibular teeth.
Located in Media / / ANATOMY / DENTITION
Image C header Occlusal surfaces of the mandibular cheek teeth (labelled)
The occlusal surfaces of the cheek teeth show the enamel ridges forming blade like structures across the occlusal surfaces of the teeth. The indentation between each enamel ridge corresponds to the shape of the occlusal surface of the opposing tooth. Each enamel ridge occludes with the enamel edges of the opposing teeth, which makes the cheek effective in shearing through vegetation.
Located in Media / / ANATOMY / DENTITION
Image Innervation and formation of new dental tissue in a mandibular cheek tooth
Each mandibular tooth contains two vertically aligned laminae. For most of the length of each lamina, the dentine encloses a pulp chamber that tapers towards the occlusal end of the tooth. At the apical end the two pulp chambers converge. Dental tissue starts to be formed at the apex of the tooth and becomes thicker as it moves towards the occlusal end. Ameloblasts produce enamel. The odontogenic organ forms pre-odontoblasts that mature into odontoblasts that form tubular dentine. The tubules contain nerve fibres but near the occlusal end of the tooth the odontoblasts appear to transform into postodontoblasts that deposit atubular tissue. The image is modified from drawing by Bishop (1995).
Located in Media / / ANATOMY / DENTITION
Image Relationship of nasolacrimal duct with apex of large upper incisor (labelled)
This skull is from a wild rabbit. Part of the bony canal that encloses the nasolacrimal duct has been removed to expose the duct within it. The duct bends medially at the apex of the large upper incisor. Only a small amount of apical elongation would compress the duct at that point.
Located in Media / / ANATOMY / DENTITION
Image D source code Annotated skull showing features of PSADD
This skull shows many of the changes that take place during PSADD. The white arrows point to elongated apices of the cheek teeth. The blue arrows point to deformed sections of bone over curve roots of the teeth. The turquois arrow points to a poorly enamelled tooth with ridges on its surface, The green arrows point to loss of alveolar bone supporting the teeth. The yellow arrow points to translucent bone. The black arrow points to gaps where crowns have broken off some teeth and the red arrows points to deformed bone over distension of the maxillary sinus caused by onstruction of the nasolacrimal duct.
Located in Media / Collections / Skulls
Image Description of the features of advanced dental disease
This image of the skull of a rabbit in the advanced stages of dental diseases has had arrows added to highlight the changes that have taken place. The GREEN arrows point to the elongated, calcified apices that have penetrated the alveolar bulla into the orbit. These teeth are ankylosed into the bone. The BLUE arrow points to the apex of the second upper cheek tooth that has penetrated the zygomatic prominence of the maxilla, which is the place that an elongated apex of this tooth always appears. The BLACK arrows point to crowns that have broken off completely. The PINK arrows point to two teeth with remaining crowns: a peg tooth and part of the second lower cheek tooth. The peg tooth still has enamel is the only crown that looks relatively normal. The crown of the second cheek tooth has split and fallen apart. The RED arrows point to thin translucent bone, which is always a feature of skulls of rabbits with advanced dental disease.
Located in Media / Collections / Skulls