Bruxism is the act of gnashing and grinding the teeth. Bruxism is common in children and adults of both sexes, affecting about 25-30% of children and roughly one in twenty adults. There is no significant difference between males and females .
Bruxism is divided into two main types- Nighttime grinding and daytime grinding. Nighttime grinding (nocturnal bruxism) is a back and forth, side-to-side motion where the lower teeth rub against the upper teeth, creating a characteristic grinding sound. Daytime grinding (clenching) is a rocking motion of the lower teeth against the upper teeth without the teeth actually making the side-to-side motion. While bruxing only happens during sleep, clenching can occur both during the day and at night . Both nocturnal bruxism and clenching are “parafunctional activities,” as they are not part of normal chewing and swallowing.
Continue Reading » Bruxism: Symptoms, Causes, and Treatment
The digastric is a double muscle of the throat which is located under the chin, behind and below the corner of the jaw, immediately in front of the top of the sternocleidomastoid, one for each side of the jaw and neck. It gets its name from the Greek word for "two bellies". The Greek word dia means double and gaster means belly hence digastric meaning "two-bellied".Bibliography item arnold not found. The digastric is made up of an anterior and posterior belly. The anterior belly extends from the digastric fossa of the mandible and the posterior belly extends from the mastoid notch of the temporal bone. Both bellies then insert to the body of the hyoid bone via a fibrous loop over a common intermediate tendon between the two bellies.
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The temporalis muscle is a large, thin fan-shaped muscle located in the side of the skull above and in front of the ear. It is a muscle of mastication and its role is similar to the masseter, which is to elevate the mandible (lower jaw) and so close the mouth. Although the masseter is the more powerful muscle the temporalis is an important chewing muscle. It starts at the temporal bone of the skull but passes all the way down beneath zygomatic arch (cheek bone), attaching to the mandible, enabling it to assist the masseter in closing the jaw but also to retract the mandible.
Continue Reading » Temporalis Muscle: Location, Action and Trigger Points