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Results for “Temporal Muscle”

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At least 955 records · Page 53Linked to original sources
PubMed1990

Bite-to-bite variation of muscular activity in cats.

Changes in electromyographic (EMG) activity between successive bites in the jaw-closing muscles of cats are described for the reduction of food with different textures. Plots of these data suggest, and statistics confirm, that one cannot predict the magnitude of EMG activity from one bite to the next, but that predicting the direction of change in EMG activity (i.e. increases or decreases) may be possible, given the relative magnitude of a bite. The patterns observed also show that the degree of variability between masticatory cycles differs among the jaw-closing muscles and with food texture. These patterns of muscle activity are related to the neural control of jaw movements.

Animals↗
PubMed1980

Jaw forces.

Explore the source record for details and available documents.

Dental Stress Analysis↗
PubMed1998

Examination of nerve distribution to masticatory muscles using a silicone permeation technique.

The detailed anatomical distribution of nerves throughout the human body has generally been studied by dissection of fixed cadavers in liquid. In this traditional method, it is difficult to maintain the position of nerves on their respective muscles. It is also difficult to keep the distributed form of the nerves. To understand the morphology of nerves, it is essential to determine their location and distribution precisely. In this study the masseter muscle was removed from a cadaver after fixation with formalin. The muscle was then permeated with silicone using the following procedure. The muscle fixed by 10% formalin was dehydrated with alcohol. After dehydration, alcohol was replaced with methylene chloride. The sample was permeated by silicone in a permeater. Following dissection, enamel was applied to the nerve by hand to fix its position. This new permeation method provided excellent localization of nerves innervating the muscle and has the added advantage of providing a three-dimensional structure of neural anatomy similar to the casting procedures used to visualize blood vessels.

Diffusion↗
PubMed1997

Intramuscular temporalis fascia: a guide to procurement of temporalis myofascial flaps.

The purpose of this study is to demonstrate an intramuscular fascial layer within the temporalis muscle. This can be used as an inferior plane when developing a temporalis myofascial flap for temporomandibular joint reconstruction. The advantages of using this plane include relatively bloodless zone, adequate thickness of flap for reconstructive purposes, and residual temporalis muscle to prevent the temporal concavity deformity. Cadaveric and clinical examples are presented.

Humans↗
PubMed1998

Traumatic chronic TMJ dislocation: report of an unusual case and discussion of management.

Dislocation of the temporomandibular joint (TMJ) is most often spontaneous, but it can be associated with direct or indirect head and neck trauma. The disorder may be treated in general by simple closed techniques, if managed acutely. If the dislocation becomes chronic, however, open reduction is usually required. The article discusses various methods for an open surgical approach described in the literature. A case of a prolonged TMJ dislocation is presented, involving a severe bilateral mandibular dislocation with the condyles displaced into the infratemporal fossa and the lateral poles of the condyles articulating on the inner aspect of the zygomatic arch. An open approach, involving masseter, temporalis, and the medial pterygoid muscles, was utilized, followed by the use of scissors mouth props, Erich arch bars, and postoperative elastic traction.

Adult↗
PubMedDate not supplied

Effect of resilient liners on masticatory muscle activity of edentulous patients: clinical and electromyography studies.

This investigation evaluated how the soft lining of both maxillary and mandibular complete dentures influences the activity of the masseter and temporalis muscles. Electromyography was used to determine changes in muscle activity. The findings, expressed by Root Mean Square values, indicated an increase in muscle activity after insertion of dentures and prior to application of soft lining material. These activities decreased gradually throughout the 12-week evaluation period following the application of soft liner. Significant differences were noted between masseter and temporalis muscle activity during mastication of different types of food.

Analysis of Variance↗
PubMed2003

[Electromyographic changes in bruxism after auricular stimulation. A randomized controlled clinical trial].

AIM: The aim of this study was to verify in bruxism patients the possible efficacy of auricular stimulation in reducing the hypertonicity of some masticatory muscles. METHODS: Forty-three bruxism patients were randomly allocated to 3 groups: acupuncture, needle contact for 10 seconds, no treatment (control). Helkimo's clinical dysfunction index (CDI) and anamnestic dysfunction index (ADI) were used to assess the functional state of the masticatory system. The resting electrical activity of the anterior temporalis (AT), masseter (MM), digastric (DA) and sternocleidomastoid (SCM) muscles was measured, according to Jankelson, with surface electrodes at baseline, after stimulation and continually for 30 minutes (120 measurements in total). The electromyographical variations in the 3 groups were studied with t test for independent samples. RESULTS: Acupuncture and needle contact were superior to control in reducing the muscle hypertonicity of all muscles except SCM. In the comparison between acupuncture and needle contact the former showed better results only for the right TA and left DA (p = 0.000). CONCLUSION: In this study it was possible to measure the efficacy of the stimulation of only one point or area, which is an ideal model for research in acupuncture. The auricular area we chose for stimulation was never used before for the purpose of relaxing masticatory muscles. Acupuncture and needle contact for 10 seconds showed similar effects.

Acupuncture, Ear↗
PubMed1992

Malocclusion and masticatory muscle activity: a comparison of four types of malocclusion.

Electromyographic activities of the temporalis and masseter muscles during mastication were measured in patients who visited this clinic for orthodontic treatment of progenia. The results obtained were compared with those previously obtained in patients with other types of malocclusion and relationships between types of malocclusion and activities of the masticatory muscles were examined. Several interesting results were obtained, including: 1) the muscle activities were significantly higher in patients with deep bite than in patients with any other types of malocclusion and 2) inefficient mastication patterns, evidenced by higher temporalis muscle activities on the balancing side than on the working side, were most frequently observed in patients with edge bite. These results indicate that the clinical evaluation of masticatory muscle activities may be useful in improving orthodontic treatment and in determining a proper retention period after the treatment. The results also suggest that orthodontic treatment should include some type of dynamic myofunctional therapy in addition to the correction of static structural abnormalities.

Child↗
PubMedDate not supplied

Biomechanical interpretations of some bony structures in the skull.

For the causal understanding of some evolutive morphological particularities at the level of the lateral wall of orbits (in mammals and in man), the authors have resorted to biomechanical interpretations of bony structures at the cranium level. To this effect some stress factors as well as the modeling effect on the local bone morphogenesis have been analysed.

Animals↗