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FRP - Crowns/Bridges/Wear/TMD/SDA/IMPLANTS > Occlusion > Flashcards

Occlusion Flashcards

1
Q

definition of a stable occlusion

A

One in which occlusal contacts help to limit the possibility of tooth movement (drifting, tipping, over-eruption)

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2
Q

what is ICP

-describe this in terms of which teeth are contacting

A

The position of “best fit” between the maxillary and mandibular teeth (therefore, a position determined by the teeth)-The position which the mandible aims for at the end of the chewing cycle

-On posterior teeth, the lower buccal cusps and upper palatal cusps occlude against the fossae and marginal ridges of the opposing teeth
The lower incisal edges and canine tips occlude against the cingulum area of the opposing teeth

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3
Q

movement of working and non working sides

A

Working - Rotation

Non working - downward/forward/translation

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4
Q

name 3 forms of guidance and what teeth are involved

A

Anterior Guidance (Canines and Incisors)

Group Function (includes posterior teeth)

Balanced Articulation (complete dentures only)

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5
Q

describe anterior guidance

A

Anterior Guidance:

in excursions one or more anterior teeth contact and there is immediate “disclusion”of all the posterior teeth

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6
Q

describe group function

A

Group Function:
in excursions a number of teeth on the working side
contact and there is disclusion of teeth on the
non-working side

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7
Q

parafunction effect

A

Purposeless clenching and grinding of the teeth
Forces exerted are greater and of longer duration than during function
Contacts may occur in many positions of the mandible
Forces may be horizontally directed
Protective neuromuscular reflexes do not operate
Damage to the teeth, the periodontium, the muscles and joints may result

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8
Q

name some tooth positions

A 
Retruded Contact	Positon	
• Intercuspal	Positon	
• Centric	Occlusion	
• Edge to Edge	
• Protrusivecontact
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9
Q

name some jaw positions

A 
Retruded Axis Posi:on	
• Maximum Opening	
• Centric	Rela:on	
• Protrusion	
• Rest Posi:on
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10
Q

what is the rest position

A

Rela:onship of the mandible to the maxilla
when the patient is relaxed
and sitting upright
• Interocclusal clearance 2-3mm free way space

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11
Q

what is RCP

A

First tooth contact when the mandible is in
retruded axis positon
• Most superior anterior
positon of the condylar head in the glenoid fossa

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12
Q

what is a facebow and what does it record

A

Horizontal record of hinge axis of mandible
• A caliper-like instrument used to record the spacial relationship of the maxillary arch to some anatomic reference point or
points
• This relaConship is transferred to an articulator
• Facebow orients the maxillary cast in the same relationship
to the opening axis of the articulator
• Customarily the anatomic references are the mandibular
• condyles transverse horizontal axis and one other selected
anterior point

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13
Q

what measurement value for the reference plane locator

A

inferior orbital margin? - 43mm above lateral incisor

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14
Q
  • how to mount an upper cast

- how to mount a lower cast

A

Upper cast - Facebow

Lower cast - registration

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15
Q

what to organise to:
Reorganised approach
Conform approach

A

Reorganised - RCP

Conform - ICP

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16
Q

when to use wax as a registration material

A 
When	there are	enough	teeth	
and	the	bite	in ICP is	obvious	
you	don’t	need	wax.		
• If	too	much	wax	is	used	and	the	
lower cast is mounted	like	this	
the	OVD will	be	increased	and	
the	restoration will be high	in the bite whenplaced.	
• When	using	wax	you	must	
ensure it is thin and cusp contact points
are	visible
17
Q

when to use registration paste

A 
When	ICP	wont	be	
obvious	to	the	technician	
• Silicone	paste	that	sets	
quickly	
• A	small	amount	is	needed	
• Too	thick	and	it	will	
increase	the	OVD	
• Occlusal	contacts	must	be	
visible	through	the	
material
18
Q

acceptable articulator choices

A

semi adjustable

average value

19
Q

what are the average values (of an average value articulator

A
  • Sagittal Condylar Guidance Angle 30 degrees
  • Bennet Angle 15 degrees
  • Incisal Angle
20
Q

What is the sagittal condylar guidance anlge

-what record is needed to set it

A

the angle at which the condyle descends down the glenoid fossaof the TMJ in the saggital plane
-protrusive record edge to edge

21
Q

what is the bennett angle

A

angle decribed by orbiting angles during lateral protrusive movements
-distance the NW condyle moves medially measured in degrees compared to a straight path

22
Q

what tooth/tooth contact occurs on the:

  • NW side
  • Working side
A
  • NW - dissimilar cusps contact

- Working - similar cusps contact

23
Q

what is centric occlusion

A

occlusion of opposing teeth, when mandible is in centric relation

24
Q

what is centric relation

A 
The	maxillo-mandibular	
relationship in which the	
condyles	articulate with the	
thinnest avascular portion	of	
their respective disks with	the	
complex	in the anteriorsuperior position against the	
shapes	of	the	articular	eminencies.		
• This position is independent of	
tooth contact.		
• It	is restricted to a purely	
rotary	move-	ment	about	the	
transverse horizontal axis
25
Q

what is the retruded contact position

A 
• That	guided	occlusal
relationship	occurring	
at	the	most	retruded
position	of	the	condyles	
in	the	joint	cavities.	A	
position	that	may	be	
more	retruded	than	the	
centric	relation	position
26
Q

what is the retruded axis position

A 
The	position	the	
mandibular condyle	
adopts during the	terminal	hinge	
movement of	opening	
or	closing.	See	also	
hinge axis.	
• Anterior superior	position	of the condyle within the fossa
27
Q

all dentures are made along what part of posselts

A

retruded arc of closure (Centric relation)

28
Q

what aspects make up mutually protected occlusion

A
  • canine guidance
  • posterior disclusion in lateral excursion
  • no NW/W side contact
  • no protrusive interference
29
Q

what are occlusal interferences

A

undesireable tooth contactsthat may produce mandibular deviationduring close to ICP/hinder smooth form to or from ICP

30
Q

how to get patient into RCP

A

Bimanual manipulation of mandible into RAP
• Patient asked to slowly close together un first tooth contact (RCP)
• Bite registration taken in this position (RCP/CR record)
• Diagnostic wax up of normal anatomy of teeth in this position
• Vacuum form stent made on the wax up.
• Stent used as a template to try in planned changes with Protemp

FRP - Crowns/Bridges/Wear/TMD/SDA/IMPLANTS (8 decks)

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