Occlusion Revision Questions

Question 1

What is border position

Answer 1

One determined by the anatomy of the TMJ and associated musculature

Question 2

Posselts Envelope

Answer 2

Border movement in the sagittal plane

Question 3

ICP

Answer 3

intercuspal position - centric occlusion, tooth position regardless of condylar position, comfortable bite, tips of palatal/lingual cusps of upper posterior teeth should occlude with surface of lower

Question 4

E

Answer 4

Edge to edge - teeth slide forward from ICP glding on palatal surface of anterior teeth, incisal edge of upper and lowers touch (translating movement)

Question 5

Pr

Answer 5

Protrusion - condylar moves forwards and downwards on articular eminnenece, only incisors and canines touch, no posterior tooth contact leading to eventually no tooth contact

Question 6

T

Answer 6

Max opening - no tooth contact, mouth wide open, full translation of condyle over the articular eminence

Question 7

R

Answer 7

Retruded axis position - reproducible jaw position, no tooth contacts, most superior anterior position of the condylar head in the fossa, terminal hinge axis

Question 8

RCP

Answer 8

retruded contact position - first tooth contact when mandible is in retruded axis position, ICP approx 1mm anterior to RCP

Question 9

What is the biologic width

Answer 9

2mm

Question 10

Open

Answer 10

Protrusion and depression

Question 11

Close

Answer 11

Retraction and elevation

Question 12

What does static occlusion include

Answer 12

Incisor relationship
Molar relationship
OJ/OB
Crossbites
Openbites
Individual tooth contacts
RCP - ICP slide

Question 13

Sagittal condylar guidance

Answer 13

an angle formed in horizontal plane when downward movement of condyle during protrusion
Viewed lateral aspect

Question 14

What is the Bennetts Angle

Answer 14

Formed by the sagittal plane and the path of the mandibular condyle during lateral movement when viewed in a horizontal plane
Movement of non working condyle in horizontal plane during lateral movement

Question 15

What does the non working side do?

Answer 15

Moves downwards, forwards and medially

Question 16

What does the working condyle do?

Answer 16

Rotation about vertical axis

Question 17

Canine guidance?

Answer 17

Mandibular moves to working side and contact only between canines and no posterior contacts

Question 18

Group function

Answer 18

Mandible moves to working side and multiple teeth in contact, seen in toothwear patients

Question 19

What is fremitus?

Answer 19

Excessive vibration of tooth due to premature contact
Some mobility can occur
Press index finger on each maxillary tooth moving forward, get patient to tap teeth and check movement

Question 20

Bruxism

Answer 20

Parafunctional grinding of teeth that leads to occlusal trauma
Toothwear, mobility, tooth migration, hearache, earache, pain, stiffness in TMJ

Question 21

Recording occlusion using articulator

Answer 21

Use facebow transfer and inter-occlusal registration for lower cast
acron
average value - bennet angle = 15 degrees, condylar guidance = 30 degrees
semi adjustable

Question 22

What is conformative approach

Answer 22

The resotration is in harmony with exising jaw relationship

Occlusion of new resotration is provided in a way that the occlusal contacts of other teeth remain unaltered

Question 23

When do you not use the conformative approach

Answer 23

Increase in vertical height needed to make space for resotrations
Teeth severly out of position
Change in appearance wanted
History of occlusally related failure or # of exisitng resotrations

Question 24

What is the reogranised approach

Answer 24

Plan to provide new resotration on different occlusion
patient guided into a terminal hinge closure to detect intial tooth contacts
taken at a slightly increased OVD
Must use registration medium

Question 25

What records for mounting casts?

Answer 25

Jaw reg and occlusal rims

tooth shade and mould

Question 26

Freeway space

Answer 26

RVD-OVD
if negative - due to increased OVD - denture clicking
if teeth contact during speech - not enough interoccusal space so OVD needs reudced to make more freeway space

Question 27

What is Christensen’s Phenomenon

Answer 27

A gap that appears between posterior ends of opposing flat occlusal rims when mandible is protruded
Leads to instability in full denture unless compensating curves are placed

Question 28

What is a facebow?

Answer 28

Records relationship of maxialla to the hinge axis of rotation of mandible
Transferring angle of occusal plane, relative to horizontal reference plane