Major functions of the masticatory system Flashcards
(31 cards)
What are three major functions of the masticatory system?
- Mastication
- Swallowing
- Speech
What is the pool of neurons within the brainstem of the CNS that controls rhythmic muscle activities?
Central pattern generator
T/F
Mastication is a learned and repeated pattern (muscle engram)
True
What are the two phases of mastication?
- Opening
- Closing
What phase deals with crushing and grinding?
Closing phase
How wide does the intercuspal position go in the opening phase of mastication?
16-18 mm
During the crushing phase where does the intercuspal position go to?
From 16 -18 to 3 mm apart
How far lateral of the starting position does the crushing phase go?
3-4 mm
T/F Buccal cusps of maxillary teeth are almost directly under the buccal cusps of the mandibular teeth on the side to which the mandible has been shifted.
False
The mandibular teeth are under the maxillary teeth
When you close what position do the teeth go?
Intercuspal position
What is the grinding phase?
It is the continuation of the closure phase
T/F cuspal inclines pass across each other
True
T/F
The harder the food, the more lateral the closure stroke
True
T/F
The harder the food, the less chewing strokes are needed
False
More chewing strokes needed
T/F
There are many contacts when food is first introduced into the mouth.
False
There are very few contacts at first
What is the avg. length of time for tooth contact during mastication?
194ms
Tall cusps and deep fossae promote what type of chewing strokes?
Vertical
Flattened or worn cusps promote what type of chewing strokes?
Broader
What produces irregular and less repeatable chewing strokes?
Malocclusion
What are the avg biting forces in females?
79-99lbs
What are the average biting forces for males?
118-142 lbs
What are the forces of mastication on the first molars?
91-198 lbs
What are the forces of mastication on the central incisor?
29-51 lbs
T/F
Dentures give you about 1/4 biting force as natural teeth.
True
