Oral function 3 - feeding sequence Flashcards Preview

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Flashcards in Oral function 3 - feeding sequence Deck (44)
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1

what is the first part of the feeding sequence

ingestion

2

what is ingestion

movement of food from the external environment into the mouth

3

how is ingestion accomplished

by biting with your anterior teeth and/or using ‘tools’ such as cutlery, cups etc.

4

what do lips provide in the feeding sequence

provide an anterior ‘seal’

5

what is the second part of the feeding sequence

transport

6

what is stage 1 transport

Stage I transport is moving material from the front of the mouth to the level of the posterior teeth.

7

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

8

what is after transport

mechanical processing

9

what happens in mechanical processing for solid foods

Some solid foods must be broken down and mixed with saliva before they can be swallowed

10

what happens in mechanical processing in moist solid foods

Moist solid foods such as fruit have to have fluid removed before transport and swallowing

11

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

12

what muscles are involved in food processing

the 'mandibular muscles'
the supra hyoid muscles
the tongue muscles
the lips and cheeks

13

how does the tongue control bolus

It gathers food and rotates to reposition the bolus on the occlusal table

14

what is the tongues role in chewing

the tongue plays a key role in controlling and transporting the bolus within the mouth.

15

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.

16

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

17

what are the 3 phases of the chewing cycle

opening phase
closing phase
occlusal phase

18

what is the opening phase

the jaw depressor muscles are active

19

what is the closing phase

jaw elevator muscles are active

20

what is the occlusal phase

mandible is stationary, teeth are joined. In the ICP

21

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.

22

what should be considered when designing prostheses

chewing style

23

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).

24

if the dentures have occlusal surfaces which are evenly worn, what is this suggestive of

vertical (chopping) mandibular movement

25

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.

26

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.

27

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

28

what does mechanical breakdown of food in the mouth result in

facilitates swallowing
might improve digestive efficiency in GI tract

29

what does masticatory performance correlate with

occlusal contact area

30

when is it not necessary to replace missing teeth

the other components of the masticatory apparatus are functioning properly