Flashcards in Oral function 3 - feeding sequence Deck (44)
what is the first part of the feeding sequence
what is ingestion
movement of food from the external environment into the mouth
how is ingestion accomplished
by biting with your anterior teeth and/or using ‘tools’ such as cutlery, cups etc.
what do lips provide in the feeding sequence
provide an anterior ‘seal’
what is the second part of the feeding sequence
what is stage 1 transport
Stage I transport is moving material from the front of the mouth to the level of the posterior teeth.
what are the steps to stage 1 transport
• Food is gathered on the tongue tip
• The tongue retracts, pulling the material to the posterior teeth. PULL BACK PROCESS
what is after transport
what happens in mechanical processing for solid foods
Some solid foods must be broken down and mixed with saliva before they can be swallowed
what happens in mechanical processing in moist solid foods
Moist solid foods such as fruit have to have fluid removed before transport and swallowing
how is food generally chewed/masticated
Generally food is chewed/masticated by premolar and molar teeth however, some soft foods are ‘squashed’ by the tongue against the hard palate
what muscles are involved in food processing
the 'mandibular muscles'
the supra hyoid muscles
the tongue muscles
the lips and cheeks
how does the tongue control bolus
It gathers food and rotates to reposition the bolus on the occlusal table
what is the tongues role in chewing
the tongue plays a key role in controlling and transporting the bolus within the mouth.
what do the tongue and cheeks work together to do
The tongue and the cheek act in a reciprocal manner to place the food on the occlusal surfaces of the teeth. ‘tongue pushing’ (red) and ‘cheek pushing’ (blue) are observed during chewing.
what are the tongue movements during chewing
The forward movement of the tongue during the occlusal and initial opening phases creates a contact between the tongue and the hard palate
The contact zone moves progressively backwards squeezing the processed food through the fauces – the so called ‘squeeze-back’ mechanism.
This material accumulates on the pharyngeal surface of the tongue and remains there until swallowing occurs.
During processing of solid foods, the mouth is continuous with the oropharynx
A posterior seal may be produced during the ingestion of liquids (liquids are swallowed from the mouth without stage II transport
what are the 3 phases of the chewing cycle
what is the opening phase
the jaw depressor muscles are active
what is the closing phase
jaw elevator muscles are active
what is the occlusal phase
mandible is stationary, teeth are joined. In the ICP
how does the chewing cycle differ from person to person
it is a narrower chewing cycle for brittle foods such as carrots and a wider one for tougher foods such as meat.
what should be considered when designing prostheses
if the patient performs ruminator mandibular movements what kind of teeth should be used
use teeth with cusps to achieve balanced occlusion (especially when patients have favourable ridge form).
if the dentures have occlusal surfaces which are evenly worn, what is this suggestive of
vertical (chopping) mandibular movement
what type of teeth should be used for vertical mandibular movement
In this case, especially in flat, atrophic mandibular ridges, cuspless teeth might be used.
why is it important to consider tongue movement when designing prosthesis
inaccurate placement of the mandibular teeth might interfere with tongue’s movements and will compromise the retention/stability of the denture as if the tongue does not have enough room it will hit the denture. You want the teeth to be on the ridge.
what is the tongue important for in dentures
The tongue is important in controlling the denture. Some patients can use their tongue to control their denture while they eat incisally, this is called neuromuscular control
what does mechanical breakdown of food in the mouth result in
might improve digestive efficiency in GI tract
what does masticatory performance correlate with
occlusal contact area