Experimental masseter muscle pain in humans affected integrated jaw-neck movements by increasing the neck component during continuous jaw opening- closing tasks.
The ratio between head and jaw movement amplitudes was significantly larger during the first pain trial compared with control. Jaw movement amplitudes did not differ significantly between any of the trials after corrected Wilcoxon tests. The head movement amplitudes were significantly larger during masseter muscle pain trials compared with control. Differences in movement amplitudes between trials were analysed with Friedman's test and corrected Wilcoxon matched pairs test. Simultaneous movements of the mandible and the head were registered with a wireless optoelectronic three-dimensional recording system. Each subject performed two trials without pain (controls) and two trials with masseter muscle pain, induced with hypertonic saline as a single injection. Sixteen healthy men performed continuous jaw opening- closing movements to a target position, defined as 75% of the maximum jaw opening. The aim of this study was to investigate the effect of induced masseter muscle pain on jaw-neck movements during a continuous jaw opening- closing task. The effect of masseter muscle pain on this integrated motor behaviour in man is unknown. Wiesinger, B Häggman-Henrikson, B Hellström, F Wänman, AĪ functional integration between the jaw and neck regions has been demonstrated during normal jaw function. The retention of a small number of teeth in the older adult used to support overdentures appears to sustain the CSA of two jaw closing muscles and therefore could enhance these patients' masticatory ability compared with those who were edentulous.Įxperimental masseter muscle pain alters jaw-neck motor strategy. No significant differences were observed with the X-ray density between different muscles or dental states. The CSA of the masseter and medial pterygoid muscles was significantly smaller in edentulous subjects compared with dentate subjects but no significant difference was observed between subjects wearing overdentures and those with a natural dentition.
There were no significant differences between left and right jaw muscles, but the CSA of the masseter muscles were significantly larger than the medial pterygoid muscles. CSA and X-ray density of two jaw closing muscles, masseter and medial pterygoid were measured and evaluated using CT. The sample consisted of 24 subjects aged 55-68 years. Cross-sectional study of a group of older patients subdivided into dentate, edentulous and those wearing overdentures supported by two to five teeth. To determine, using computer tomography (CT), whether the retention of a small number of teeth in the older adult used to support overdentures could affect the cross-sectional area (CSA) and X-ray density of two jaw closing muscles. Newton, James P McManus, Frank C Menhenick, Stephen Jaw muscles in older overdenture patients.