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CSB- SS sheets questions > occlusion > Flashcards

occlusion Flashcards

1
Q

when do we carry out basic occlusal exams

A

part of every history and exam

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2
Q

when do we carry out comprehensive occlusal exams

A

TMJ disorders, crowns , bridges

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3
Q

what type of occlusal exams do we have

A

basic

or comprehensive

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4
Q

what type of skeletal patterns can we have

A 
class 1
class 2 
class 3
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5
Q

what are class 1 patterns like

A

lower jaw in proportion to upper jaw

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6
Q

what are class 2 patterns like

A

lower jaw is retruded

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7
Q

what are class 3 patterns like

A

lower jaw is protruded

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8
Q

how do we look for asymmetry

A

Tell the patient what you are doing and look at the patient straight on
Look for any obvious deviations

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9
Q

what do we look for in the TMJ

A

stand behind pt and listen for clicks crepitus and disc movement

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10
Q

how do we check for the range of movement of the TMJ

A

Willis height gauge & measure in mm

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11
Q

what else do we check in terms of the TMJ

A

size
symmetry
tenderness
tonicity

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12
Q

what is the origin of the master

A

zygomatic arch

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13
Q

what is the insertion of the master

A

lateral wall of the ramps and anglee of the mandible

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14
Q

what is the innervation of the masseter

A

mandibular division of the V3

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15
Q

what is the action of the masseter

A

clenching

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16
Q

what is the origin of the temporalis

A

temporal surface of the skull and temporal fascia

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17
Q

what is the insertion of the temporalis

A

coronoid process and anterior border of the ramps

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18
Q

what is the innervation of the temporalis

A

V3 of the CNV

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19
Q

what is the action of the temporalis

A

action

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20
Q

what is the origin of the lateral pterygoid

A

lateral surface of lateral pterygoid plate and greater wing of sphenoid

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21
Q

what is the action of the lateral pterygoid

A

protrusion and opening

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22
Q

what do we look for in the IO

A

Sharp cusps on the upper arch will cause lines that match with occlusion
Cheek ridging occurs when the patient bites down on buccal mucosa
Tongue scalloping occurs by tongue being squashed against teeth

23
Q

DEFINE ICP

A

The position of maxilla and mandible when teeth are in maximal intercuspation
Most people have a stable ICP, an unstable ICP occurs when patient bites diff every time

24
Q

What is an overjet

A

horizontal distance between cusp tips when teeth are in ICP

25
Q

what is an overbite

A

Vertical distance between cusp tips when teeth are in ICP

26
Q

what is a crossbite

A

One (or multiple teeth) are out of normal ICP relationship

27
Q

what is RCP

A

The position of the mandible in the 1st point of contact upon closing when condyle is placed most superiorly and posteriorly in glenoid fossae

28
Q

when do we need to record the RCP this on a patient

A

on patients who do not have a stable ICP

29
Q

which mandible is consistently reproducibility

A

the RCP

30
Q

how to record the contacts

A

articulating paper

31
Q

what are the types of articulating paper

A

thick 250 microns
thin 40 microns
ideal 8 microns

32
Q

what is the average perception

A

10 microns

33
Q

when is thick articulating paper used

A

prosthetic work

34
Q

what is the thin articulating paper used for

A

simple cons work

35
Q

what is the ideal articulating paper used for

A

complex crown work

36
Q

describe cracked cusp syndrome

A

Pain on releasing on biting and very well localised

Why? Interferences/ weakened cusps/ Bruxism/ Trauma/ Extreme temp change in tooth

37
Q

stages of cracked cusp syndrome

A

Occlusal loading of a cusp associated with a crack opens the crack (microcracks)
Crack fills with fluid
Release of occlusal loading causing crack to rapidly close
Some fluid is expelled to surface of tooth
Some fluid is forced into D tubules leading to pulp stimulation & pain on release

38
Q

tx options for cracked tooth syndrome

A

Desensitise area with fluoride varnish/ tubule occlusion with bonding agents
Remove cracked portion of the tooth and place direct restoration
Place indirect restoration (crown/onlay)

39
Q

what is the origin of the anterior belly of the digastric muscle

A

digastric fossa of the mandible

40
Q

what is the insertion of the anterior belly of the digastric muscle

A

intermediate tendon

41
Q

what is the innervation of the posterior belly of the digastric muscle

A

facial nerve

42
Q

what do the digastric muscles do

A

depresses and draws the mandible back as it opens

The digastric muscle elevates the hyoid bone (used in swallowing & speech)

43
Q

what is the function of the articulator

A

The job of articulators are to mimic a patients jaw movements
Essentially we are trying to replicate jaw movements of plaster models
To allow examination of the occlusion (ICP, RCP, Protrusive and lateral movements)
To allow fabrication of restorations (Crowns, bridges, dentures, splints)
To investigate proposed changes to the occlusion (change from CG to GF)

44
Q

what are the types of articular

A

Simple hinge
Average value
Semi adjustable
Fully adjustable

45
Q

describe simple hinge articulator

A

Open and closes the mouth by rotation only

Useful in seeing if what is being made will be high in ICP

46
Q

describe average value articulators

A

Average value allows for lateral excursion and protrusion as they have moveable joints
Values can’t be altered from patient to patient
Set up for average distances for average patients

47
Q

describe semi adjustable articulators

A

Can replicate ICP, RCP, Lateral movements and position of hinge axis (relationship of condyle
Must be used with face bows

48
Q

describe fully adjustable

A

Can replicate Position of hinge axis (which can’t be measure on a patient) (& all of above)

49
Q

what is the working side in the upper

A

buccal

50
Q

what is the working side on the lower

A

lingual

51
Q

what do we do if the tooth is high in ICP and lateral excursion

A

reduce cusp height

52
Q

what do we do if the tooth is high only in ICP

A

make deeper fossa

53
Q

what are the muscles of mastication

A

The masseter
Temporalis
Lateral pterygoid
Medial pterygoid

CSB- SS sheets questions (4 decks)

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