PMID: 11933309Apr 6, 2002Paper

An electromyogram study on mandibular movement in unilateral cleft lip and palate patients before and after orthodontic treatment

The Bulletin of Tokyo Dental College
T SakamotoY Isshiki

Abstract

The purpose of this study is to investigate masticatory muscle function in subjects with unilateral cleft lip and palate compared with normal occlusion and the extents of improvement before and after orthodontic treatment. Subjects were twenty pretreatment patients, thirty posttreatment patients and ten controls. Electromyograms were recorded from their masticatory muscles during masticatory movement and tapping movement. Reduction of duration/stroke ratio (D/S) was observed in electromyograms obtained during masticatory movement after orthodontic treatment. The reduction was especially notable in the masseter muscle. In spite of a significant reduction in coefficient of variation (CV) values, a significant difference between the posttreatment group and the control group indicated some persisting irregularity in masticatory movement. Electromyograms taken during tapping movement showed no change in latency in the posttreatment group, but duration of the silent period (SP) was shortened and SP appearance increased. The findings outlined above reveal electromyographically clear improvements in masticatory muscle functions and jaw reflex mechanisms after orthodontic treatment. Nevertheless, parameters for subjects with cleft lip a...Continue Reading

References

May 1, 1967·The Journal of Prosthetic Dentistry·P SchaererH A Zander
Sep 1, 1981·Journal of Oral Rehabilitation·R Furuya, B Hedegård
Jul 1, 1993·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·A E NoverrazM A van't Hof
Aug 1, 2009·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·K A RussellD Paedo

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Citations

Aug 15, 2002·The Bulletin of Tokyo Dental College·Kenji NakakawajiYasushige Isshiki
Apr 1, 2021·European Journal of Oral Sciences·Diana CassiMaria Grazia Piancino

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