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https://pubmed.ncbi.nlm.nih.gov/33233758/
https://pubmed.ncbi.nlm.nih.gov/33233758/


<blockquote><p>Abstract
Abstract
Acquired dental problems are among the most frequently encountered diseases in pet rabbits. However, early symptoms are often overlooked because the affected animals first appear completely asymptomatic. Alterations from anatomical reference lines according to Böhmer and Crossley applied to standard skull X-ray images, have been shown to be indicative of tooth health problems in pet rabbits. Despite its proven usefulness, there are exceptions in which the anatomical reference lines appear not to be suitable for application. We addressed this issue by quantifying the cranial morphology of a large data set of pet rabbit patients (N = 80). The results of the morphometric analyses revealed considerable diversity in skull shape among the typical pet rabbits, but variance in only a few parameters influences the applicability of the anatomical reference lines. The most substantial parameter is the palatal angle. Specimens in which the anatomical reference lines could not be applied, have a rather large angle between the skull base and the palatal bone. We recommend to measure the palatal angle before applying the anatomical reference lines for objective interpretation of dental disease. Pet rabbits with a palatal angle larger than 18.8° are not strictly suitable for the successful application of the anatomical reference lines.
Acquired dental problems are among the most frequently encountered diseases in pet rabbits. However, early symptoms are often overlooked because the affected animals first appear completely asymptomatic. Alterations from anatomical reference lines according to Böhmer and Crossley applied to standard skull X-ray images, have been shown to be indicative of tooth health problems in pet rabbits. Despite its proven usefulness, there are exceptions in which the anatomical reference lines appear not to be suitable for application. We addressed this issue by quantifying the cranial morphology of a large data set of pet rabbit patients (N = 80). The results of the morphometric analyses revealed considerable diversity in skull shape among the typical pet rabbits, but variance in only a few parameters influences the applicability of the anatomical reference lines. The most substantial parameter is the palatal angle. Specimens in which the anatomical reference lines could not be applied, have a rather large angle between the skull base and the palatal bone. We recommend to measure the palatal angle before applying the anatomical reference lines for objective interpretation of dental disease. Pet rabbits with a palatal angle larger than 18.8° are not strictly suitable for the successful application of the anatomical reference lines.


Keywords: Lagomorpha; evolution; geometric morphometrics; malocclusion; masticatory apparatus; pathology; teeth.</blockquote><p>
Keywords: Lagomorpha; evolution; geometric morphometrics; malocclusion; masticatory apparatus; pathology; teeth.


Notes:
Notes:
<blockquote><p>Conclusions
Conclusions
The present study showed that there is considerable diversity in skull shape among the typical pet rabbit (of no specific breed). The domestication of rabbits—most likely with a single origin from wild populations of France [56,57,58]—has led to a very high phenotypic diversity with more than 200 breeds recognized worldwide [57]. The morphological variation is reflected in a wide variety of commercial and laboratory uses. Nevertheless, the applicability of the occlusal reference line is not significantly influenced by variance in parameters such as the length of the maxillary molar row or of the palatal bone. It is slightly affected by the caudal height of the nasal bone and the cranial length to height ratio. In pet rabbits with a rather high caudal nose and a short skull in relation to their skull height, the occlusal reference line is not always applicable. However, these parameters explain only partially why in some cases the occlusal reference line cannot be applied. The most substantial parameter that allows to predict if the occlusal reference line is applicable or not is the palatal angle. If the angle between the skull base and the palatal bone is larger than 18.8°, the occlusal plane of the molars is shifted outside the occlusal reference line. In these cases, they are not suitable for successful objective interpretation of norm- and malocclusion.</blockquote><p>
The present study showed that there is considerable diversity in skull shape among the typical pet rabbit (of no specific breed). The domestication of rabbits—most likely with a single origin from wild populations of France [56,57,58]—has led to a very high phenotypic diversity with more than 200 breeds recognized worldwide [57]. The morphological variation is reflected in a wide variety of commercial and laboratory uses. Nevertheless, the applicability of the occlusal reference line is not significantly influenced by variance in parameters such as the length of the maxillary molar row or of the palatal bone. It is slightly affected by the caudal height of the nasal bone and the cranial length to height ratio. In pet rabbits with a rather high caudal nose and a short skull in relation to their skull height, the occlusal reference line is not always applicable. However, these parameters explain only partially why in some cases the occlusal reference line cannot be applied. The most substantial parameter that allows to predict if the occlusal reference line is applicable or not is the palatal angle. If the angle between the skull base and the palatal bone is larger than 18.8°, the occlusal plane of the molars is shifted outside the occlusal reference line. In these cases, they are not suitable for successful objective interpretation of norm- and malocclusion.


=== 2018 Developmental pathways of periodontal tissue regeneration: Developmental diversities of tooth morphogenesis do also map capacity of periodontal tissue regeneration?===
=== 2018 Developmental pathways of periodontal tissue regeneration: Developmental diversities of tooth morphogenesis do also map capacity of periodontal tissue regeneration?===

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