Functional adaptability of jaw-muscle spindles after bite-raising.

Abstract:

:In a previous experiment, we found that masseter muscle spindles show functional plasticity after 5 to 15 days under increased occlusal vertical dimension (iOVD). In the present study, we hypothesized that spindle function would eventually recover if longer observation periods were allowed. Therefore, in this study we investigated changes in masseter muscle spindle function over periods of 1 day to 8 weeks. Masseter muscle-spindle responses to ramp-and-hold jaw stretches were recorded from the mesencephalic trigeminal nucleus in 35 barbiturate-anesthetized female Wistar rats. The rats were previously divided into Control and iOVD groups, and those in the iOVD group received a 2.0-mm composite resin build-up to the maxillary molars. In this condition, there were no statistically significant differences in masseter muscle spindle sensitivity between Control and iOVD in the six- and eight-week subgroups. Our results further indicate a high degree of adaptability in masseter muscle spindle function following changes in OVD.

journal_name

J Dent Res

authors

Yabushita T,Zeredo JL,Fujita K,Toda K,Soma K

doi

10.1177/154405910608500914

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

849-53

issue

9

eissn

0022-0345

issn

1544-0591

pii

85/9/849

journal_volume

85

pub_type

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