Support And Complete Dentures Flashcards
Define the term support
Support is used to Denote the resistance to vertical forces exerted on the denture. Vertical forces arise from functionally generated forces through mastication and clinching and grimding in the absence of food
Where are all forces ultimately transmitted
To bone via the mucosa
What are the masticatory forces loads that natural teeth can encounter and what are maximum masticatory forces for a complete denture
20kg for natural teeth
6-8kg for a complete denture
Which of the following mucosa are keratinized, non keratinized And partially keratinized Buccal mucosa Floor for the mouth Ridge mucosa
Buccal mucosa - partially keratinized
Floor of mouth- non keratinized
Both of these are not firmly attached to bone
Attached ridge mucosa- keratinized
What compromises oral mucosa even more to withstand masticatory forces even more
Systemic states and disturbances of metabolism such as Nutritional deficiencies Anaemia Diabetes Hypertension
How does an uneven ridge affect the function of a denture
It affects the resistance and loading forces especially lateral forces
What are the 3 ways in which a material can react when a load is applied to it
An elastic material will displace immediately and immediately return to original form
When viscous substances such as oils are subjected to loads they are gradually displaced and reach resting state and don’t recover after removing load
A combination of these two effects occur in a viscolasti materials
What are the clinical considerations oral mucosa
Oral mucosa has limitations for providing support for dentures that one must try to reduce the occlusal load per unit area as much as possible
List the 7 ideal qualities for a denture base material
1-vv have a variable consistency under variable mouth conditions
2-selective resiliency with tissues
3-resiliance with quick recovery- recover after force removed
4-compress on tissues but rigid on occlusal side
5-shock absorbing
6-reduce forces transmitted through base onto tissue
7-flexibility that can be controlled
What are the primary stress bearing areas on the upper denture
Residual ridge and hard palate
What is a secondary site of support in the upper denture
Rugae
What can be relieved in the upper denture
Incisive papillae bc it covers nerves and blood vessels
The midpalatal suture to prevent rocking denture
Why is the lower denture less suitable for primary support
Bone beneath the mucosa is cancellous and the crest bone resorbs unevenly
What area on the loweer denture beating base is made of smooth corticle bone
Buccal shelf
What kind of epi covers the retromolar pad areas
Non keratinized
