jaw relationship in RPD

Question 1

when is jaw registration done

Answer 1

to mount primary cast and working cast

Question 2

What are the stages of establishing jaw relationship

Answer 2

1. to establish a vertical dimension
2. to establish a reproducible horizontal relationship w mandible either CR position or RCP

Question 3

What is the rest vertical dimension

Answer 3

vertical dimension when jaw is in rest position. Rest position It is the habitual postural position of the mandible when patient is resting comfortably and condyles are in a neutral unstrained position in the glenoid fossa

Question 4

What are some factors affecting RVD

Answer 4

head posture, presence/ absence of teeth, body position, presence/absence of prosthesis, chronic neuromuscular disorder, drugs that have muscle relaxant effect, parafuctions like bruxism, age( due to alveolar growth)

Question 5

What is occlusal vertical dimension

Answer 5

vertical dimension when teeth are fully intercuspated

Question 6

How is RVD and OVD related

Answer 6

RVD - FWS= OVD

FWS is the space between upper and lower teeth when mandible is in resting position

Question 7

what happens if excessive OVD is chosen

Answer 7

patient experience clicking during speech, trauma to denture bearing tissues ( alveolus and soft tissue), difficultly pronouncing P,B, M, strained appearance, TMD

Question 8

What happens if inadequate OVD chosen

Answer 8

lack of facial support, reduced masticatory efficiency, cheek biting, dribbling saliva, angular cheilitis, TMD