Gündemir, O, Michaud, M, Altundağ, Y, Karabağlı, M, Onar, V and Crampton, D (2024) Chewing asymmetry in dogs: Exploring the importance of the fossa masseterica and first molar teeth morphology. Anatomia, Histologia, Embryologia, 53 (3). ISSN 0340-2096

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Abstract

Dogs are animals with strong bite force. This strong bite mechanism has led to significant changes in the skeletal system such as fossa masseterica. It can be thought that one side is used more than the other side in chewing and is related to the preference of using the same side's hand, eye and foot. In the study, directional asymmetry and fluctuating asymmetry, which occurs as a result of chewing asymmetry, were examined on the first molar teeth and the fossa masseterica in 85 dog mandibles including a wide diversity of morphotypes. The association of high PC1 values for directional asymmetry with a pronounced cranial index, as evident in breeds like Pekingese, Pomeranian and Bulldog, indicates a potential evolutionary or selective breeding trend favouring brachycephaly. On the contrary, guardian breeds like the German shepherd and Bernese mountain dog, which typically require strong jaws for their roles, showcased reduced PC1 values, which might be related to their functional morphology. Similarly, the PCA results for the first molar teeth shape variations also highlighted the influence of cranial shape, with boxer dogs displaying notably higher PC1 values. The fluctuating asymmetrical distributions provided valuable insights into individualistic variations. Interestingly, no specific breed distribution trend was observed for these asymmetries, indicating a more individual-based variation rather than breed-based. It is essential to note that while these results provide valuable insights, further studies are required to understand the underlying causes better. Factors like genetic variations, developmental processes, dietary habits and external environmental factors could play pivotal roles in these observed morphological differences.

Item Type:	Article
Additional Information:	This is the peer reviewed version of the following article: Gündemir, O., Michaud, M., Altundağ,Y., Karabağlı, M., Onar, V., & Crampton, D. (2024). Chewingasymmetry in dogs: Exploring the importance of the fossa masseterica and first molar teeth morphology. Anatomia, Histologia, Embryologia, 53, e13050. https://doi.org/10.1111/ahe.13050, which has been published in final form at https://doi.org/10.1111/ahe.13050 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Uncontrolled Keywords:	0707 Veterinary Sciences; Developmental Biology
Subjects:	Q Science > QH Natural history > QH301 Biology Q Science > QL Zoology
Divisions:	Biological & Environmental Sciences (from Sep 19)
Publisher:	Wiley
SWORD Depositor:	A Symplectic
Date Deposited:	16 May 2024 14:06
Last Modified:	16 May 2024 14:06
DOI or ID number:	10.1111/ahe.13050
URI:	https://researchonline.ljmu.ac.uk/id/eprint/23184

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