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Journal of Dental Research
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Biological

Effects of a Liquid Diet on Temporomandibular Joint Mechano-receptors

T. Ishida*, T. Yabushita and K. Soma

Orthodontic Sciences, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School, Tokyo Medical Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan

Correspondence: takaorts{at}tmd.ac.jp

Load during mastication is an important factor for the development and maintenance of mechano- receptor properties. The purpose of this study was to examine property changes in the rat TMJ mechano-receptors under conditions of liquid diet feeding and low articular load during the growth period. The hypothesis was that alterations in mastication of liquid diet might increase TMJ mechano-receptor sensitivity. Sixty-six two-week-old male Wistar rats were divided into two groups: a control group that was fed on whole pellets, and an experimental group that was fed a liquid diet. Electrophysiological recordings from the TMJ units were obtained from the trigeminal ganglion when the rats were 5, 7, and 9 weeks old. In the experimental group, TMJ mechanoreceptor sensitivity increased, because the firing threshold gradually decreased and the maximum instantaneous frequency gradually increased. In conclusion, functional properties of TMJ mechano-receptors under low articular loading conditions cannot mature normally within the growth period.

Key Words: TMJ mechano-receptor • development • mastication • early development

Journal of Dental Research, Vol. 88, No. 2, 187-191 (2009)
DOI: 10.1177/0022034508328626
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