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BDS5 OSCE > Prosthodontics > Flashcards

Prosthodontics Flashcards

1
Q

what is kennedy class 1

A

bilateral free end saddle

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2
Q

what is kennedy class 2

A

unilateral free end saddle

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3
Q

what is kennedy class 3

A

bounded saddle

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4
Q

what is kennedy class 4

A

anterior bounded saddle crossing midline

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5
Q

what is craddock class 1

A

tooth borne

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6
Q

what is craddock class 2

A

mucosa borne

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7
Q

what is craddock class 3

A

combination of tooth and mucosa borne

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8
Q

what is the definition of retention

A

resistance of the denture to vertical displacement

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9
Q

what are the methods of retention

A

clasps
soft tissue undercuts
adhesion
friction
path of insertion
precision attachments/implants

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10
Q

what is the definition of indirect retention

A

resistance to rotational displacement

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11
Q

what does reciprocation do

A

prevent a clasp arm moving the clasped tooth

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12
Q

what is the function of bracing

A

stop the denture moving laterally

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13
Q

name the types of upper major connectors and advantages of them

A

strap - doesnt interfere with tongue
ring - stays away from gingival margin
horseshoe - keeps palate clear

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14
Q

questions to ask in a denture history

A

why were teeth lost
how long have they worn dentures for
how many dentures have they had
have they got a favourite denture
have they got a preferred design
which do they prefer

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15
Q

what to examine extraorally on a denture patient

A

lower facial height
naso-labial angle
facial support
smile line
aesthetics of existing dentures
abnormalities
limited opening

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16
Q

what is the definition of support

A

the resistance to vertical movement of the denture towards the tissue

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17
Q

what is the definition of stability

A

the resistance to horizontal (lateral) movement of the denture

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18
Q

disadvantage of a simple hinge articulator

A

cannot reproduce the movements of the mandible

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19
Q

what are the requirements of an articulator

A

post must be on the incisal table
incisal post should be at 0 degrees
casts must be able to be easily separated from the bases

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20
Q

purpose of a surveyor

A

identify, analyse and mark the maximum contours of tooth and tissue surfaces of dental casts for the fabrication of removable partial dentures
establish a suitable path of insertion which utilises guide surfaces on the teeth to provide long term retention

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21
Q

what is the process of surveying

A

place cast on the table of the surveyor with occlusal plane horizontal
tripod the cast
use the analysing rod to look for undercuts
use the graphite to mark the undercuts
decide where path of insertion and removal will be and mark this in red

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22
Q

how long must a CoCr clasp be and why depth of undercut does this engage

A

15mm long
engaging a 0.25mm undercut

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23
Q

undercut gauge for cast gold alloy

24
Q

undercut gauge for wrought stainless steel clasp

25
what are guide planes
2 or more parallel axial surfaces on abutment teeth which limit the path of insertion of a denture can be naturally occurring or may need prepared
26
what do guide planes provide
increased stability reciprocation prevention of clasp deformation improved appearance
27
when would you not use a polyether (impregum) impression material
in severe undercuts
28
why do you need to record the occlusion when making dentures
know the position of teeth in relation to each other know what is normal for the patient and keep it the same if planning to change occlusion facilitate denture design ensure loading forces are applied correctly to teeth and underlying mucosa help the technician set up the teeth ensure the denture is stable and not dislodged in function
29
what is freeway space
space between the occluding surfaces of the maxillary and mandibular teeth when the mandible is in physiologic resting position
30
what problems cause displacement of record blocks
overextension of the peripheries too much lip support
31
what does LIMBO stand for
lip support incisal level midline buccal corridor occlusal plane
32
how much tooth should someone show on rest
1-2mm depends on age
33
what is the neutral zone
the space between the lips and cheeks on one side and the tongue on the other side where the forces between the tongue and cheeks are equal
34
what is the normal freeway space
2-4mm
35
how do you measure the freeway space
RVD - OVD = FWS
36
what do you look at at a denture try in before it is in the mouth
are the bases stable on the cast are the borders smooth is the extension shaped to the depth and width of the functional sulcus is wax distorted or well adapted check occlusion for even contacts is there an AOB are the centre lines coincident is the pin on the table
37
what do you check at a denture try in
retention and stability base extension speech aesthetics
38
how do you assess the base extension of a denture
hold tissues away from denture and see if it drops
39
how do you assess speech with a denture
listen for fricatives count from 60-70 F and V sounds
40
what is the problem and how do you fix if at a denture try in the teeth are contacting during speech
insufficient FWS so OVD needs reduced re-register at new OVD then ask lab for remount and re-try
41
what is the problem and how do you fix if at a denture try in there is significant whistling sounds during s sounds
air is escaping too much OVD may need to be increased or the anterior tooth position changes re-register at new OVD and ask lab for remount and re-try
42
if the OVD has been increased by accident how do you fix this
teeth need to be removed from one or both dentures and replaced with a wax rim
43
if the OVD has been decreased by accident how do you fix this
a wax rim can be added to the teeth on one or both dentures or teeth removed from one or both dentures and replaced with a bigger wax rim
44
what do you check at insertion stage of denture making
retention and stability base extensions LIMBO position of teeth FWS contacts in RCP speech and aesthetics discomfort insert and remove
45
what are the instructions to give a patient about wearing a denture
may take time to adjust some discomfort normal speech may lisp eating may be difficult wear as much as possible
46
what are the common areas for denture trauma to occur
lingual frenum mylohyoid ridge undercuts
47
what factors contribute to poor denture hygiene
poor manual dexterity inability to self care xerostomia poor diet old worn dentures lack of oral health knowledge wearing dentures full time ill-fitting dentures poor neuromuscular control
48
what are the effects of poor denture hygiene
caries periodontal disease denture stomatitis halitosis pain
49
what should you advise patients to clean their denture with
soap and soft brush then chemical soaking
50
what type of denture cleansing tablet is most commonly used and is safe for both acrylic and chrome dentures
alkaline peroxides - sterodent
51
what type of denture cleansing material is not suitable for chrome dentures due to its corrosive properties
alkaline hypochlorites - milton
52
what advice is given to patient about denture hygiene regime
brush dentures daily (after every meal, over basin, no toothpaste as it will scratch it) soak dentures daily (20mins every evening) leave dentures out at night (warn about stomatitis risks) visit dentist regularly
53
what are the advantages of using impression compound instead of alginate
good for gagging patients rapid working time seconds rather than minutes
54
what do you look at when assessing an impression
are all the edentulous areas included are the sulci areas ton be included in the denture recorded fully are deficiencies present due to air inclusion is the impression fit for purpose or not
55
what are the advantages of special trays
accurate peripheral extension uniform thickness of material reduced amount of material
56
what does placing stops of greenstick on special trays allow for
positioning maintaining space for material allow consistent placing of tray

BDS5 OSCE (14 decks)

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