Morphological Mechanism Of Correlation Between Dental Variables And Cranial Length Of The Bactrian Camel(Camelus Bactrianus) And MPR

A comprehensive investigation was conducted into the adaptation mechanisms of teeth in the Bactrian camel (Camelus bactrianus) in both warm and cold arid regions. The study analyzed morphology of the teeth, correlation analysis between the teeth and skull, CT three-dimensional MPR images and the anatomical structure of the teeth in the Bactrian camel.Two-dimensional measurements using linear regression analysis of the camel's teeth showed gender variation, where the males teeth is larger than the females, especially in the canine and incisors. Allometric results also showed differences between female and male groups. From the linear model analysis in the male, dental variables M/D and B/L showed positive growth. In females, I2 (B/L), P3 (M/D) and P3 (B/L) showed positive growth, while the other variables showed negative growth. Indicators of skull length in males showed positive growth, while the females showed negative growth. Analysis further showed that different teeth have different growth rates (b) and different feeding habits influence the shape of teeth. Variation between tooth size and skull length show a correlation in males rather than females. In the female and male+female camel, molar teeth and size of the skull growth varied little.Multi-planar reconstruction (MPR) CT images were acquired on a single three-dimensional spiral scan. Three-dimensional measurements of density and length were used in linear regression analysis. The male results showed I1 AL b= 0.003, r= 0.848, C AL6= 0.003, r= 0.848, P3 ALb= 0.004, r= 0.945, M3 CW b=-0.002, r= 0.802, female results showed P5 AL b=-0.384, r= 0.768, NT b=-0.392, r= 0.934, while male+female results showed M1 AL b= 0.011, r= 0.400, NT b= 0.003, r= 0.440, P<0.005.Analysis of the two-dimensional and three-dimensional results indicate obvious gender growth differences, which showed male teeth growth was faster than the female and male+female groups. Other growth differences were seen in male incisor teeth, canine and premolars. A greater correlation between mandibular teeth growth and skull length was seen in male, female or male+female groups, as compared to the upper jaw teeth growth. In conclusion, the study indicates that the development of teeth is not only due to genetic factors and behavioral factors, but also by animal nutrition, grassland types, ages and other factors.