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BDS2 CDS Prosthodontics Removable > Setting teeth for RPD > Flashcards

Setting teeth for RPD Flashcards

1
Q

aim when for setting teeth for RPD

A

aim when setting artificial teeth for partial dentures is to have the teeth set in a position that will complement the existing teeth,
- thus restoring the arch, aesthetics and function.

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2
Q

impact on patient if aim of setting teeth achieved

A

will greatly improve patient self-confidence and protect their ‘denture privacy’

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3
Q

point to remember when setting teeth for CoCr base

A

for cobalt chromium bases the scheme for mechanical retention for the PMMA to metal base must be considered. (post or mesh depending on available space)

CoCr is setting directly over free end saddles – can impact
- May need to reduce the acrylic teeth to accommodate

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4
Q

how can artificial teeth be selected to look natural?

A

Not set to perfect, slightly irregular, shade and tone varies to hide false teeth

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5
Q

2 types of artificial teeth material

A

acrylic and procelain

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6
Q

most popular artificial teeth material

A

acrylic

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7
Q

what are tooth cards used for

A

to choose shade of acrylic artificial teeth

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8
Q

properties of plastic acrylic teeth

A

Chemical bond with the denture base
- Only processed 50% and then rest when finalising so better bond

Natural appearance

Silent in function

tough
- 5 year durance

Soft-low abrasion resistance

Easily trimmed and polished/customised

Cold flow under pressure

Insoluble in mouth fluids-some dimensional change

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9
Q

bonding of acrylic teeth

A

teeth bond chemically with the PMMA denture based – this is an important

consideration but attention must be paid to the removal of the tooth bond layer (cross-lining).

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10
Q

what do acrylic teeth look like

A

natural

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11
Q

advantage of acrylic teeth being easily trimmed

A

can be customised

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12
Q

are acrylic teeth hard wearing?

A

only best quality

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13
Q

properties of porcelain teeth

A

Mechanical attachment with the denture base. (silane coupling agent)
- No chemical bond at all
Anterior teeth – metal pin on back, mechanical retention
Posterior – hollow area
Natural Appearance

Make noise when bite potentially

Brittle

Friable
- grinding removes surface glaze

Hard-high resistance to abrasion
- Wear down opposing dentition

Inert in mouth fluids-no dimensional change

High heat distortion
- no permanent deformation under forces of mastication

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14
Q

how are anterior porcelain teeth attached?

A

mechanically attached, by metal pins in anterior teeth

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15
Q

how are posterior porcelain teeth attached

A

mechanically attached, by holes (diatorics) manufactured into posterior teeth.

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16
Q

can porcelain teeth be easily customised?

A

no - cannot trim the ridge lap area or polished surface which therefore normally precludes their use.

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17
Q

is porcelain hard wearing

A

yes - very

in some cases would not be recommended for occlusion opposing natural teeth because of this hardness.

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18
Q

properties of modified acrylic/composite/polymers

A

Chemical bond with the denture base.

Partial bonding - recommended mechanical and / or bonding agent (4-meta)

Higher abrasion resistance

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19
Q

what are mould charts used for

A

to select mould or shape of tooth

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20
Q

how to choose mould/shape of tooth from mould chart

A

copy what the patient already has

technician may override choice if they see a problem with your chosen mould

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21
Q

where should shade selection be carried out

A

in clinic

under natural light - hard to match under unnatural light

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22
Q

advantage and disadvantage of better designed acyclic teeth

A

more expensive

but more natural looking – see mamelons through incisor tip

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23
Q

3 common tooth shapes

A

square
ovoid
tapered

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24
Q

4 bits of information from the tooth/mould chart

A

square, ovoid and tapered are most commonly used shapes

length of anterior teeth - two dimensional

  • length of canine to canine
  • length of central incisor

width of central incisor

25
what must be considered when selecting tooth mould
angulation guidance of cusps high cusps – impact on contact, unstable denture during function higher cuspal angle – can be better for mastication for molars
26
what often dictates where teeth are set when making a partial denture
the arrangement and position of remaining natural teeth firstly, re-establish midline (central incisor) and compromise around that
27
why understanding the material that is used to make RPDs is important
impact clinical decision - communicate well with other team members - good knowledge can ensure you are comfortable with treatment plan
28
why may you need to compromise when setting teeth
available space (e.g. accomodate central and lateral in smaller space than naturally be) since tooth loss may also involve tooth drifting and a change in available space to set the artificial teeth.
29
why would a larger mould be chosen for a tooth
to allow customisation
30
what can customisation effect
the denture base and tooth bond
31
where should artificial teeth be trimmed from
remove from the ridge lap - Trim from the back Removal from the length of the tooth, i.e. the cervical margin or the incisal tip can affect the shade.
32
why shouldn't tooth be trimmed from incisal edge
too thin, tooth becomes thick and square looking
33
how much tooth should be trimmed
small bit at a time till fits the mucosa
34
what effect does removing tooth have on the bond
The more reduced the less chemical bond with denture base – more veneer like Easily broken off Too much trimming can look unnatural
35
what is the ridge lap in artificial teeth made of
more heavily cross linked acrylic
36
why would a tooth need reduced/trimmed
to fit a pronounced ridge or if a CoCr base being used
37
the more the ridge lap is reduced....
'softer’ bonding area if reduced in area can affect the bond with the ‘enamel’ layer having a harder surface.
38
how to prevent de-bonding in heat cured dentures
Trim teeth with diamond cutters - Produce a rougher, abraded surface (micro-abrasion) Use a post for retention when space is limited for PMMA - Ensure no wax or grease on teeth surface - Use detergent when boiling out - Remove as creates a barrier – less sticky No mould seal residue present when processing
39
how to prevent de-bonding in self-cured dentures
Try to avoid heavy contact on the denture teeth – cuspal interference - Not fully processed – soft Cold cure - Not fully set – easy to adapt (used for CoCr) No wax or grease - Use detergent when boiling out (removing wax from the flask) No mould seal Add a drop of monomer onto tooth surface and allow to soak in before acrylic (self cure PMMA)
40
where to look when considering removing tooth surface
in 3 dimensions (occlusal, frontal and sagittal view) accommodate the dental arch firstly
41
what can overlap do
disguise falseness
42
how should teeth sit in correspondence with arch
in line with arch survey line determines the extension of the flange
43
what does the survey line determine
the extension of the flange
44
why is not advisable to have large areas blocked out
therefore creating ‘dead spaces’ and resulting food impaction. - Don’t want acrylic to enter the undercut
45
how far should tooth protrude in sagittal view
not too far, should blend into surrounding teeth be careful as neck of tooth can protrude when incisal tip isn't
46
what will articulator show
lateral excursion check guidance - important when setting teeth
47
what should be checked in relation to guidance
wear facets on the natural teeth should be checked. The artificial teeth must conform to the existing tooth surface wear. The natural tooth guidance is followed by the artificial teeth. - Check if teeth are going to collide with lower incisors - Glides over, no premature contact (can break off)
48
when is the denture base used
for the trail denture stage (and occlusal rim stage)
49
what is the denture base
trial, temporary base which is discarded at the processing stage of denture production
50
types of denture base
rigid base with wax saddle light cured, acylic or shellac
51
CoCr trial uses
lines which teeth are positioned to once CoCr base constructed for trial - trial done in wax to see if any problems arise before making CoCr
52
what cast is used for the trial
duplicate cast or master cast - trial should have positive fit - clasps can be incorporated if required
53
why is light cure material not the best idea for tooth trial
wax can stick
54
how to provide symmetry to the appearance
set teeth to long axis slight angulation maybe to correspond so symmetry maintained (mirror image of arch) contact points should also correspond to natural dentition
55
what compromise/improvisation may be necessary for setting posterior teeth
May not conform to the classical arrangement of teeth - Depends on the available space position and occlusion is dictated by the natural teeth. The denture teeth should not be set in contradiction to this guide. Teeth are set according to the edentulous saddle tooth space. - It is acceptable for example that a premolar is set in a space previously occupied by a molar. Needs to follow the natural tooth guidance
56
where should the final adjustment of tooth length be
at chair-side if the denture is not tooth supported - some movement might be expected
57
why is it an advantage for the dentist to set teeth at chair-side
less time, less visits lab may leave incisal tip longer - so dentist can match ideally chairside
58
how can the flange effect the position of the denture
fills space | nothing else may fit there

BDS2 CDS Prosthodontics Removable (10 decks)

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