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FINALS - Restorative Dentistry > Occlusion > Flashcards

Occlusion Flashcards

1
Q
A
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2
Q

what is the action of the temporalis

A

elevation and retraction of mandible

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3
Q

what is the action of the lateral pterygoid

A

protrusion and depression of mandible
lateral movements

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4
Q

what is the action of the medial pterygoid

A

elevation
lateral movement
protrusion

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5
Q

what is the action of the masseter

A

elevation and protraction of mandible
lateral movement

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6
Q

what are the 2 major movements of the mandible

A

rotation and translation

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7
Q

what is rotation

A

small amount of mouth opening (only 20mm)
condyle and disc remains within articular fossa
no downwards or forwards movement

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8
Q

what is hinge movements

A

rotation of the condylar heads around an imaginary horizontal line through rotational centres of condyles

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9
Q

what does a facebow record

A

relationship of maxilla to terminal hinge axis of rotation in mandible

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10
Q

what is translation

A

lateral pterygoid contracts
articular disc and condyle move and travel downwards and forwards along incline of articular eminence

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11
Q

what is posselts envelope

A

border movements of the mandible in the sagittal plane

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12
Q

what are the parts of posselts envelope

A

ICP
edge to edge
protrusion
maximum opening (T)
retruded axis position
RCP

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13
Q

what is ICP

A

comfortable bite
maximum interdigitation of teeth

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14
Q

what is edge to edge

A

incisal edges of upper and lowers touch

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15
Q

what is the movement from ICP to edge to edge

A

teeth slide forward from ICP guiding on palatal surfaces of anterior teeth

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16
Q

what is protrusion

A

condyle moves forwards and downwards on articular eminence
no posterior tooth contacts

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17
Q

what is maximum opening

A

no tooth contacts and mouth wide open

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18
Q

what is the position of the condyle during maximum opening

A

full translation of condyle over articular eminence

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19
Q

what is retruded axis position

A

no tooth contacts

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20
Q

what is the position of the condyle during retruded axis position

A

superior anterior position of condyle head in fossa

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21
Q

what is RCP

A

first tooth contact when mandible is in retruded axis position

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22
Q

what is the distance between ICP and RCP

A

1mm

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23
Q

what is the movement of the mandible between RCP and ICP

A

slides forward into ICP

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24
Q

how do you establish the working side of the mandible

A

it is the side which the mandible slides to when eating

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25
what causes lateral movement of the mandible
contraction of one lateral pterygoid
26
what is the bennet angle
angle formed by the sagittal plane and path of mandibular condyle during lateral movement when viewed in a horizontal plane
27
how do you mark tooth contacts
millers forceps and fine articulating paper
28
when do you mark tooth contacts
before preparing a tooth and removing restoration after placement of a crown and restoration
29
what do tripodised contacts show
where the opposing cusps contact (ICP stops)
30
what do you look at in static occlusion
incisor relationship molar relationship overjet/overbite cross bites open bites individual contacts RCP-ICP slide
31
what are functional cusps
cusps that occlude with opposing teeth in ICP lingual cusps of uppers buccal cusps of lowers
32
what are non-functional cusps
cusps that do not occlude with opposing teeth in ICP buccal cusps of uppers lingual cusps of lowers
33
what is a fossa
depression on tooth surface
34
what are the ICP contacts
lingual cusp of upper molar contacts fossa of lower molar buccal cusp of lower molar contacts fossa of upper molar
35
how do you view ICP contacts
get patient to tap
36
what is overjet
relationship between upper and lower teeth in a horizontal plane
37
what is overbite
vertical overlap of incisors
38
what is crossbite
one or more teeth abnormally positioned buccal or lingually or labially with reference to opposing teeth
39
what is an anterior open bite
lack of vertical overlap of anterior teeth when posterior teeth in full occlusion
40
what is posterior open bite
failure of contact between posterior teeth when teeth are in full occlusion
41
what is canine guidance
mandible moves to working side and there is only contact between canines
42
what is a mutually protected occlusion
canine guidance posterior disclusion in lateral excursions no non-working/working side contacts no protrusive interferences
43
what is group function
mandible moves to working side and multiple teeth contact
44
what type of group function is seen in toothwear
bilateral
45
what are the only teeth that touch in protrusion of mandible
incisors and canines
46
what are occlusal interferences
undesirable tooth contacts that can produce mandibular deviation during closure to ICP or hinder smooth passage to and from ICP
47
what are the types of occlusal interference
working side non working side protrusive
48
what is a working side interference
when teeth slide to the working side there are contacts on posterior teeth with similar cusps (buccal cusps contact)
49
what is non working side interference
mandible slides to working side and there are contacts on the non-working side with dissimilar cusps (upper lingual cusps and lower buccal cusp)
50
what is protrusive interference
any posterior contact during protrusion
51
why do you want to avoid posterior contacts
not designed to absorb lateral forces musculature gets a rest if no contacts occlusal trauma and undesirable tooth movements
52
what are the 2 types of bruxism
eccentric centric
53
what is eccentric bruxism
parafunctional grinding of teeth
54
what is centric bruxism
clenching
55
what are the clinical signs of bruxism
toothwear fractured restorations tooth migration tooth mobility muscle pain and fatigue headache earache pain and stiffness in TMJ and surrounding muscles
56
what are the types of toothwear
multifactorial abrasion attrition erosion abfraction
57
what are the types of toothwear classified as
mild moderate severe
58
what is primary occlusal trauma
occlusal trauma with an intact periodontium
59
what is secondary occlusal trauma
occlusal trauma with a reduced periodontium
60
what is fremitus
palpable or visible movement of a tooth when subjected to occlusal forces
61
what is the examination checklist for occlusion
incisor relationship guidance overjet/overbite ICP contacts working/non-working/protrusive contacts pathology
62
what are the 3 types of articulator
arcon average value semi adjustable
63
what are the parts of the facebow
reference plane locator bite fork transfer jig assembly earbow
64
where should the anterior reference point for the facebow go
43mm apical to incisal edge of anterior teeth position of infraorbital foramen
65
what do you use to mark the anterior reference point
reference plane locator and marker
66
what do you apply to bite fork
bite registration paste
67
what do you do when the bite registration paste is in the bite fork
firmly seat to record cusp tips of maxillary teeth
68
what does the bite fork impression allow
accurate repositioning and mounting of maxillary cast
69
what does the facebow record
relationship of maxilla to hinge axis of rotation of mandible
70
what does the facebow allow
mounting of maxillary cast on articulator
71
how do you mount the lower cast
an interocclusal registration
72
what are the two types of interocclusal registration you can use to mount the lower cast
ICP RCP
73
when would you use wax to record ICP
if ICP not obvious to technician
74
when would you use paste to record ICP
if ICP not obvious to technician
75
when would you use record blocks to record ICP
free end saddles cannot be hand articulated
76
when would you not use any material to record ICP
if there are plenty of tooth contacts and ICP is obvious to technician
77
what is the simplest approach to mounting casts
using ICP registration without OVD increased conformative approach
78
what are the 2 reorganised approaches
ICP registration with OVD increase RCP registration with/without OVD increase
79
what is an unorganised approach
havent assessed occlusion before starting restoration change occlusion with restoration havent planned where ICP will be provide an occlusion which does not conform to previous one
80
what is the conformative approach
provision of restorations in harmony with existing jaw relationships
81
when would we not use the conformative approach
an increase in vertical height needed tooth/teeth out of position change in appearance wanted history of occlusally related failure or fracture of existing restorations
82
when would you use a reorganised approach
when you plan to provide new restorations to a different occlusion ICP non-existent need space to place restorations RCP reproducible position of mandible
83
what are the reliable techniques to place a patient into RCP
bimanual manipulation chin point guidance chin point guidance with anterior jig
84
at what angle is RCP record taken at
slightly increased OVD just prior to initial tooth contact
85
what is the space between RCP and retruded axis position on posselts envelope known as
retruded arc of closure
86
where does initial tooth contact in RCP occur on posselts envelope
any point on retruded arc of closure
87
what type of guidance does a mutually protected occlusion have
canine guidance

FINALS - Restorative Dentistry (10 decks)

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