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Functional maturation of periodontal mechanoreceptors during development in rats
Fajar Hamonangan Nasution1, Kazuo Toda, Kunimichi Soma
1Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. jarkoni@hotmail.com
Abstract:
The influence of development on periodontal mechanoreceptors (PMRs) was investigated in four groups of male Wistar albino rats aged 1, 3, 5 weeks and 6 months using an in vitro jaw-nerve preparation. The mean values of conduction velocities of the nerve innervating PMRs in 5-week and 6-month groups were significantly higher than those in the other two groups. All fiber types obtained in the 5-week and 6-month groups were Abeta. The mechanical thresholds of 5-week and 6-month groups were significantly higher than those of 1- and 3-week groups. These data suggest that the response properties of rat's PMRs are matured by 5-week after birth, when functional molar occlusion and transition of dietary contents from liquid to hard-diet can be achieved.