There is not fine information regarding the influence of diet on development of masseter muscle and its mitochondria. Objective of this study is to compare mitochondrial enzyme activity, and morphology of masseter muscle fiber cells and its mitochondria prepared from rats fed soft diet to those fed hard diet. Cross-sectional area of fiber cells and number of mitochondria per unit area prepared ...

OBJECTIVE We aimed to evaluate by longitudinal neurophysiological examinations the natural course of masseter muscle weakness that developed after percutaneous balloon compression (PBC) of the trigeminal ganglion for the treatment of idiopathic trigeminal neuralgia. METHODS The affected side of 15 patients (mean age 69.5±4.5 years) who underwent unilateral PBC were studied before, 1 month, 6 ...

BACKGROUND The study aimed to determine if ultrasonography of masseter can be used to evaluate the outcome of transcutaneous electrical nerve stimulation (TENS) in subjects with temporomandibular disorders (TMDs) such as myositis and myofascial pain. METHODS Fifteen TMD subjects with myofascial pain/myositis who satisfied the RDC/McNeil criteria were included in the study. All the subjects we...

OBJECTIVES/HYPOTHESIS To examine how preoperative imaging characteristics correlate with sialendoscopic findings and operative outcomes in patients with obstructive parotid symptoms. STUDY DESIGN Retrospective review. METHODS We identified 112 consecutive patients who underwent 134 unilateral or bilateral parotid gland sialendoscopies between December 2005 and August 2013. We reviewed clini...

Hemimasticatory spasm (HMS) is a rare disorder of the trigeminal nerve characterized by paroxysmal involuntary contractions of the unilateral jaw-closing muscles. HMS has been frequently described in association with facial hemiatrophy or localized scleroderma. A 42-year-old female presented with involuntary paroxysmal spasms of the left face, of 6 months duration. Her lower face on the left wa...

We have created an alternative method for facial reanimation. This new surgical procedure involves masseter muscle transposition combined with tensor fascia lata, and the zygomatic arch is used as a trochlea to achieve reconstruction of inferior facial paralysis. This method was used on five patients with facial palsy after excision of a malignant parotid tumour. Wide skin defect exposing the m...

Bilateral sagittal split osteotomy (BSSO) in order or advance mandible is a common surgery for patients with mandibular retrognathism. While various complications could result after this surgery, the aim of the present study was to evaluate the effect of BSSO surgery on electric activity and function of masseter muscle. 36 patients in need of mandibular advancement with BSSO technique participa...

BACKGROUND The purpose of this study was to compare the expression levels of p65 and S100 in the rat masseter muscle after the injection of different concentrations of botulinum toxin-A (BTX-A). METHODS We injected either 5 or 10 U of BTX-A into both masseter muscle of rats. As a control group, the same volume of saline was injected. After 14 days, the animals were sacrificed. Subsequently, a...

The aim of this study is to evaluate muscle fatigue in the temporal and masseter muscles in patients with temporomandibular dysfunction (TMD). Two hundred volunteers aged 19.3 to 27.8 years (mean 21.50, SD 0.97) participated in this study. Electromyographical (EMG) recordings were performed using a DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany). Muscle fatigue was evaluated on the basi...

In the present study, to elucidate the influences of the deficiency of teeth on the masseter muscle, we analyzed changes in the expression of MyHC isoform mRNAs during postnatal development in mi/mi mice using real-time PCR. By 8 weeks of age, MyHC I had nearly disappeared in the +/+ mice, while it was still present in the mi/mi, and the level of MyHC I mRNA in the mi/mi was 5.1-fold higher tha...