Electromyographic activity of masticatory muscles and mandibular movement during function in marginal mandibulectomy patients.

The purpose of this study is to evaluate the masticatory muscle activity and mandibular movement during function in marginal mandibulectomy patients. Three marginal mandibulectomy patients and three healthy subjects participated in this study. The activities of the temporalis (TA) and masseter muscles (MM) on the normal and resected sides during maximum voluntary clenching (MVC) and gum chewing (Gch), and mandibular movement during Gch were analyzed. Paired t-test, Student's t-test and one-way ANOVA were performed at P < 0.05. For MVC, integrated EMG (iEMG) in patients was lower than in healthy subjects. When iEMG of each muscle activity in patients was compared, TA activity on the resected side was greater than that of MM. There were no differences between the normal and resected sides in TA or MM. For Gch, no differences in iEMG, burst or chewing time were found between patients and healthy subjects. MVC was greater than Gch in healthy subjects, but no difference was found in patients. The range of mandibular movement along the X axis in patients was greater than in healthy subjects. Within the limitations of this study, EMG activity in patients during MVC was remarkably lower than that in healthy subjects, and altered mandibular movement was observed.

[1]  M. Naeije,et al.  Masticatory electromyographic activity in healthy young adults and myogenous craniomandibular disorder patients. , 1994, Journal of oral rehabilitation.

[2]  C. Gibbs,et al.  Biting strength and chewing forces in complete denture wearers. , 1990, The Journal of prosthetic dentistry.

[3]  T. Ohyama,et al.  EFFECT OF TEETH CLENCHING ON MUSCLE STRENGTH DURING REPEATED ISOKINETIC KNEE EXTENSIONS , 2000 .

[4]  Daniel Buchbinder,et al.  Functional evaluation following microvascular oromandibular reconstruction of the oral cancer patient: A comparative study of reconstructed and nonreconstructed patients , 1991, The Laryngoscope.

[5]  N Endo,et al.  Studies on masticatory functions in patients with surgical mandibular reconstruction. , 1972, Oral surgery, oral medicine, and oral pathology.

[6]  D. J. Neill,et al.  Functional loading of the dentition during mastication. , 1989, The Journal of prosthetic dentistry.

[7]  M. Marunick,et al.  Mastication in patients treated for head and neck cancer: a pilot study. , 1990, The Journal of prosthetic dentistry.

[8]  M Marunick,et al.  Occlusal force after partial mandibular resection. , 1992, The Journal of prosthetic dentistry.

[9]  T A Curtis,et al.  Physical problems in obtaining records of the maxillofacial patient. , 1975, The Journal of prosthetic dentistry.

[10]  A Mayanagi,et al.  An index for analysing the stability of lateral excursions. , 2002, Journal of oral rehabilitation.

[11]  L. V. Christensen,et al.  Gum chewing and jaw muscle fatigue and pains. , 1996, Journal of oral rehabilitation.

[12]  M T Marunick,et al.  Masticatory function in hemimandibulectomy patients. , 1992, Journal of oral rehabilitation.

[13]  G. Tryde,et al.  A 2-year electromyographic study of patients with an immediate complete upper and a partial lower denture. , 1989, Journal of oral rehabilitation.

[14]  W A Weijs,et al.  Electromyographic activity of the human masticatory muscles during submaximal clenching in the inter-cuspal position. , 1989, Journal of oral rehabilitation.