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Journal of Dental Research
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Biomaterials & Bioengineering

Adjustment of the Occlusal Vertical Dimension in the Bite-raised Guinea Pig

T. Yagi1,2, T. Morimoto1,*, O. Hidaka2, K. Iwata1, Y. Masuda1, M. Kobayashi1 and K. Takada2

1 Department of Oral Physiology and
2 Department of Orthodontics, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565-0871, Japan;

Correspondence: *corresponding author, morimoto{at}dent.osaka-u.ac.jp

In humans, the inappropriate occlusal vertical dimension (OVD) causes several orofacial disorders, such as bruxism and pain in the masticatory muscles and temporomandibular joint. However, it is still unclear how strictly the OVD is adjusted. To answer this question, we studied the temporal change of the OVD in bite-raised young guinea pigs. The OVD was raised by fixation of a bite-raising appliance to the lower incisors, and increased by either 3 or 1.5 mm at the first molars. After the space produced between the upper and lower molars was filled within 10 days due to eruption of the molars, the appliance was removed. In the bite-raised animals, the raised OVD was reduced until it attained that observed in the control animals, after which the OVD increased according to cranial growth. These results show that the OVD is developmentally changed and strictly controlled.

Key Words: vertical dimension • bite-raised appliance • eruption • grinding • guinea pig

Journal of Dental Research, Vol. 82, No. 2, 127-130 (2003)
DOI: 10.1177/154405910308200210
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