What is lateral jaw movement?

Contraction of the lateral pterygoid acts to pull the disc and condyle forward; thus, the action of this muscle serves to open the mouth. The other three muscles close the mouth; the masseter and the medial pterygoid by pulling up the angle of the mandible and the temporalis by pulling up on the coronoid process.

How does lateral movement of the mandible occur?

The action of all the other three muscles of mastication results in elevation of the mandible. The unilateral contraction of the lateral pterygoid muscle with the ipsilateral medial pterygoid muscle results in lateral mandibular movement to the contralateral side.

What are the movements of mandible?

There are five types of mandibular movements including rotational, horizontal axis, frontal axis, sagittal axis, and translational. Mandibular movement is affected by several factors such as the muscles used in suspending the jaw, mandibular articulation, and the synovial joint system.

What is lateral Excursive movement?

lateral excursion sideward movement of the mandible between the position of closure and the position in which cusps of opposing teeth are in vertical proximity.

What muscle moves the jaw forward?

lateral pterygoid muscle
Forward movement of the mandible The lateral pterygoid muscle pulls the mandible forwards (anterior translatory movement).

How does the lateral pterygoid open the jaw?

The primary function of the lateral pterygoid muscle is to pull the head of the condyle out of the mandibular fossa along the articular eminence to protrude the mandible. At the beginning of this action it is assisted by the digastric, mylohyoid and geniohyoid muscles.

What is the movement of the jaw called?

Jaw movement During jaw movements, only the mandible moves. Normal movements of the mandible during function, such as mastication, or chewing, are known as excursions. There are two lateral excursions (left and right) and the forward excursion, known as protrusion. The reversal of protrusion is retrusion.

How many planes of movement can the mandible move in?

three
Rotational movement of the mandible can occur in all three reference planes: horizontal, frontal (vertical), and sagittal. In each plane it occurs around a point called the axis.

What is lateral deviation?

1. An asymmetry of the face when viewed from the front. 2. A movement of the mandible to one side on opening or during forward thrusting due to a condition of the temporomandibular joint, muscles of mastication, or the teeth. From: lateral deviation in A Dictionary of Dentistry »

Is centric occlusion the same as Intercuspal position?

Centric occlusion: The occlusion of opposing teeth when the mandible is in centric relation. Maximal intercuspal position: The complete intercuspation of the opposing teeth independent of condylar position; sometimes referred to as the best fit of the teeth regardless of the condylar position.

How do you know if your masseter is enlarged?

If you are self-conscious about the square shape of your face, you may have an enlarged masseter muscle.

How do you know if you have a strong masseter?

How can you tell if you have strong masseter muscles? If you clench your teeth, the masseter muscles bulge out to the side of the face. You can feel them by pressing in the middle of the cheek as you clench and release your teeth. Face slimming involves Botox injections to reduce the size of the masseter muscles.

What does the lateral movement of the jaw mean?

This is a lateral, downward movement of the jaw to either side with easy contact and release. It aids in the placement of food between molars for chewing. There is no grinding movement, and no movement of the jaw across midline. It occurs in conjunction with vertical jaw movement.

When does the mandible move to one side?

Simply put, lateral excursion is when the mandible moves to one side. But the mechanism behind this is not as simple as it sounds. The mandible is capable of two movements if we take the condyle as the hinge: rotation and translation. Imagine a vertical and horizontal axis passing through the condyles.

What does the diagonal movement of the jaw mean?

Diagonal movement. This is a lateral, downward movement of the jaw to either side with easy contact and release. It aids in the placement of food between molars for chewing. There is no grinding movement, and no movement of the jaw across midline. It occurs in conjunction with vertical jaw movement.

When does translation occur in the mandibular system?

6. The basic movements of the mandible All mandibular motion is either ROTATION or TRANSLATION Rotation occurs when the mandible makes a hinged movement. Translation occurs when the mandible moves into a protrusive or lateral position, or a combination of the two Lateral pterygoid ‘ muscle ‘~ F V / ,- .