Response Properties of Jaw-closing Muscle Spindle during Decreased Occlusal Vertical Dimension in Rats
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- FUJITA Koichi
- Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
Bibliographic Information
- Other Title
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- 咬合高径減少に伴うラット咬筋筋紡錘応答特性
- コウゴウ コウケイ ゲンショウ ニ トモナウ ラット コウキン キンボウスイ オウトウ トクセイ
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Abstract
The masseter-muscle spindle is regarded as being highly adaptable to increases in the occlusal vertical dimension (iOVD), it is hypothesized that spindle function would adapt to a decrease in occlusal vertical dimension (dOVD) as well. Seventy-five 5-week-old female Wistar rats were divided into Control (n = 25) and Experimental (n = 50) groups ; those in the Experimental group received a 2.0-mm composite resin build-up to the maxillary molars. The Experimental group was divided into the resin-removal group (n = 25, build-up resin was removed) and the non resin-removal group (n = 25) 8 weeks later ; i. e., when the animals were 13 weeks old. Electrophysiological recordings were obtained from masseter-muscle spindle afferents in 13, 14, 15, 19, 21-week-old rats (n = 5 rats each) under general anesthesia. Masseter-muscle spindle sensitivity was significantly lower in the resin-removal group 1 week after resin-removal and for the rest of the observation period. The present results indicate that masseter-muscle spindles may not completely adapt to dOVD and may affect jaw function.
Journal
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- THE JOURNAL OF THE STOMATOLOGICAL SOCIETY,JAPAN
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THE JOURNAL OF THE STOMATOLOGICAL SOCIETY,JAPAN 75 (1), 1-5, 2008
The Stomatological society, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001206341856512
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- NII Article ID
- 130004283076
- 10024176372
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- NII Book ID
- AN00302674
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- ISSN
- 18845185
- 03009149
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- NDL BIB ID
- 9454110
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed