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Functional Adaptability of Jaw-muscle Spindles after Bite-raising

¹ Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; and
² Division of Integrative Sensory Physiology, Department of Developmental and Reconstructive Medicine, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8588, Japan

View larger version (14K): [in this window] [in a new window]   Figure 1. Schematic representation of the trigeminal mesencephalic nucleus drawn from coronal sections of the brainstem over a template form (Paxinos and Watson, 1998), –9.1 mm posterior to the bregma. An asterisk indicates the recording site. 4V, fourth ventricle; IRt, intermediate reticular nucleus; LC, locus coeruleus; Me5, trigeminal mesencephalic nucleus; Pr5, principal sensory trigeminal nucleus; py, pyramidal tract; sp5, spinal trigeminal tract; ts, tectospinal tract.

View larger version (41K): [in this window] [in a new window]   Figure 2. Examples of responses from single masseter muscle spindle units to ramp-and-hold stretch. (A) Typical responses from (a) Control group, (b) two-week iOVD group, and (c) eight-week iOVD group. (B) Ramp-and-hold stretch was applied with maximum opening distance of 7.0 mm; stimulus duration was 8.5 sec, divided into 4.5 sec and 4.0 sec for ramp-stretch and hold phases, respectively.

View larger version (12K): [in this window] [in a new window]   Figure 3. Dynamic index of normal and iOVD groups. (A) Control groups. (B) iOVD groups. A significantly lower dynamic index was observed after 2 wks of iOVD. Datapoints represent averaged data from 3 consecutive ramp-and-hold stretches in each unit. Error bars indicate SD; n means number of single afferent units; *P < 0.05 vs. one-day iOVD, and #P < 0.05 vs. the respective Control subgroup in repeated-measures ANOVA followed by Scheffé’s post hoc test. "n" refers to the number of units at each time period. Imp/s, impulses per sec.

View larger version (13K): [in this window] [in a new window]   Figure 4. Static index of normal and iOVD groups. (A) Control groups. (B) iOVD groups. A significantly lower static index was observed after 2 and 4 wks of iOVD. Datapoints represent averaged data from 3 consecutive ramp-and-hold stretches in each unit. Error bars indicate SD; n means number of single afferent units; *P < 0.05 vs. one-day iOVD, and #P < 0.05 vs. the respective Control subgroup in repeated-measures ANOVA, followed by Scheffé’s post hoc test. "n" refers to the number of units at each time period. Imp/s, impulses per sec.

Journal of Dental Research, Vol. 85, No. 9, 849-853 (2006)
DOI: 10.1177/154405910608500914


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