Oral Functions 3 - The Feeding Sequence Flashcards
List the stages in the feeding sequence.
Ingestion
Transport
Mechanical processing
What occurs in the ingestion phase of the feeding sequence?
Food from the external environment enters the oral cavity.
What provides the anterior oral seal?
Lips
What occurs in the transport phase of the feeding sequence?
The hyoid bone retracts and the oropharynx narrows
What occurs in the mechanical processing phase of the feeding sequence?
Chewing occurs via the premolars and molars.
Food is broken down and mixed with saliva
Moist solid foods have the fluid removed
Soft foods are squeezed against the soft palate by the tongue
What muscles are responsible for food processing?
Tongue muscles
Lips and cheek muscles - buccinator and oblicularis oris
Suprahyoid muscles - Digastric, mylohyoid, geniohyoid, stylohyoid
Mandibular muscles/muscles of mastication
Describe the tongue actions in CHEWING
Tongue controls the bolus
The tongue and cheek act in a reciprocal manner that maintains the bolus on the occlusal table
Moves the bolus from side to side
Squeeze back Mechanism:
Contact between tongue and hard palate in the opening and occlusal stage of the chewing cycle.
Contact zone moves progressively backwards and the tongue squeezes the processed food through the faces.
Why is bilateral chewing or ‘moving the bolus from side to side’ encouraged?
Prevents facial asymmetry
Prevents problems occurring with the muscles of mastication.
What is the difference between swallowing solid food and liquids?
Liquid:
True posterior oral seal
Swallowed from the mouth
Solids:
No true posterior seal
The mouth and the oropharynx are continuous so solids are swallowed from the oropharynx
List the phases of the chewing cycle.
Opening - depressor muscles activated
Occlusal - mandible is stationary and teeth are in ICP
Closing - elevator muscles activated
When does variation of the chewing cycle occur?
Occurs in those with altered occlusal relationships/dentition
Occurs in different food types/textures
In terms of denture design; what features of the acrylic teeth would be present/absent in an individual with lateral movements/ruminatory movements of the mandible?
Cusps present on the teeth
Provide stability
Provide a balanced occlusion
In terms of denture design; what features of the acrylic teeth would be present/absent in an individual with vertical/chopping movements of the mandible?
No cusps on the teeth
What would occur if there was inaccurate placement of posterior teeth in a denture made for the mandibular arch?
Stability would be compromised
Lack of retention
(From tongue interference)
What would occur if the teeth in a denture were buccally inclined?
Cause cheek biting and ulceration of the mucosa.
