PMID: 8972807Dec 1, 1996Paper

Adaptations of masticatory muscles to a hyperpropulsive appliance in the rat

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
G SfondriniM A Pellegrino

Abstract

The plasticity of masticatory muscles was studied by comparing rats that were wearing a protrusive appliance and were kept on a liquid diet with two control groups: (1) pair-fed rats and (2) rats that had free access to ordinary pelleted food. The animals were 45 days old at the beginning of the experiment and were studied for a period of 20 days. Three jaw muscles with different functions were examined: masseter, temporalis, and digastric. Muscle fiber composition was determined (1) by fiber counting after staining with four monoclonal antibodies, which were able to recognize the four major myosin heavy chain (MHC) isoforms and therefore four fiber types (I, IIA, IIX, IIB) and (2) by electrophoresis on 6% polyacrylamide gels. The comparison between free-diet rats and pair-fed rats showed that the change from a hard pelleted diet to a liquid diet caused a shift in fiber type and MHC distribution, characterized by an increase of IIB MHC in temporalis and digastric muscles but not in the masseter muscle. The comparison between pair-fed rats and rats wearing appliances showed on the contrary a decrease in IIB MHC and an increase in IIA and IIX MHC. The results support the conclusions that (1) rat jaw muscles can quickly adapt to f...Continue Reading

References

Jul 31, 1986·Biochemical and Biophysical Research Communications·D Danieli BettoR Betto
Nov 1, 1983·European Journal of Orthodontics·M Goret-NicaiseA Dhem

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Citations

Jul 17, 2001·Journal of Cellular Biochemistry. Supplement·N HartmannA Westphal
Jun 15, 2006·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Joseph F Y HohWendy W H Zhong
Apr 27, 2001·Journal of Anatomy·A R CobosI Fuentes
Aug 7, 2009·European Journal of Orthodontics·Thorsten GrünheidTheo M G J van Eijden
Jan 12, 2002·Plastic and Reconstructive Surgery·Nadja K SinselPaul J Guelinckx
Nov 22, 2007·Archives of Oral Biology·Yoshiki Ohnuki, Yasutake Saeki
Mar 13, 2016·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·Francesco MascarelloLisa Maccatrozzo
Feb 10, 2006·Respiratory Physiology & Neurobiology·M GelhayeM Trabalon
Dec 27, 2005·Journal of Human Evolution·Melanie A McCollumFred Schachat
Feb 1, 2007·Journal of Applied Oral Science : Revista FOB·Ana Claúdia de Castro Ferreira ContiMárcio Rodrigues de Almeida
Dec 1, 2005·Journal of Applied Oral Science : Revista FOB·Paulo César Rodrigues ContiCarlos Dos Reis Pereira de Araújo
Sep 1, 2005·Journal of Applied Oral Science : Revista FOB·Jesus Carlos AndreoAntonio de Castro Rodrigues
Oct 21, 2011·Physiological Reviews·Stefano Schiaffino, Carlo Reggiani
Feb 1, 2003·European Journal of Oral Sciences·Geerling LangenbachTheo van Eijden

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