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Thursday 2 January 2014

Oral Anatomy

Masseter is covered by
Platysma; Risorius; Parotid gland
Principal postioner of mandible during elevation is the
Temporalis
The fan shaped muscles of mastication is the
Temporalis
The antagonist muscle to masseter while retruding jaw is the
Posterior temporalis. The anterior pterygoid is synergistic with masseter while clenching.
The facial muscle(s) active during opening of jaw is(are)
Digastric group of muscles; Mylohyoid and geniohyoid; Lateral pterygoid
When the jaw is opened against resistance the
Temporalis remains silent
The antagonist muscle of elevator muscles is the
Digastric group of muscles; Mylohyoid and geniohyoid; Suprahyoid muscles
With mandible is retruded with mouth closed, the muscle involved are
Posterior fibers of temporalis; Suprahyoid fibers; Infrahyoid fibers
The duration of each chewing cycle is between
0.6 – 1 second
The chewing forces reaches a maximum with
Centric occlusion
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