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Major Connectors Flashcards

1
Q

major connectors must be what to distribute stress?

A

Rigid

- pushing one object against another object will distribute stress is both objects are RIGID

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2
Q

general description of A/P palatal bars

A
  1. most rigid
  2. most common
  3. no right angles between bars
  4. bars are perpendicular to main suture
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3
Q

describe the anterior bar in an A/P palatal bar

A

broad and thin

between rugae

6mm from gingival margin

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4
Q

describe the posterior bar in an A/P palatal bar

A

narrow and thick

1/2 tear shaped

thickest at posterior

ant to junction of the hard and soft palate

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5
Q

broad palatal strap is most common when?

A

*used ONLY when few teeth missing (1 finger width)

pt. missing 1/ 2 pre molars on either side
- has to be thicker because only one bar

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6
Q

thickness in broad palatal strap?

A

has to be thicker because single bar but this can interfere with speech problems

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7
Q

anterior border is placed where in a broad palatal strap?

A

as far posterior as possible

-

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8
Q

posterior border is what in broad palatal strap?

A

is perpendicular to median suture

NEVER CROSSED PALATE ON A DIAGONAL

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9
Q

when is full palatal coverage usually used?

A

ideal for patients with kennedy class I

  • when distal extensions are needed
  • posterior half looks like a complete denture
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10
Q

T/F full palatal coverage can be all metal

A

TRUE

  • but we do half and half
  • metal is good thermal conductor but is non-adjustable
  • cannot put post dam on full palatal coverage
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11
Q

does full palatal coverage include post dam?

A

yes – looks like complete denture in the back

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12
Q

does full palatal coverage cover tori?

A

it can with acrylic

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13
Q

kennedy class I uses what for restorative?

A

full palatal coverage

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14
Q

horseshoe use?

A

tooth borne involved
posterior molars

best with many guide planes

*used when there are tori that are inoperable at the junction of the hard and soft palate (**so when a/p palatal bar is not able to be used)

gaggers last resort

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15
Q

a/p palatal bar looks like what with a posterior bar?

A

a horshoe

but anterior bar is more thin which is advantagous

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16
Q

success with horshoe?

A

less - it covers a poor amount of surface are and rotates horizontally

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17
Q

thickness in horshoe?

A

needs to be thick to maintain rigidity but can cause speech problems

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18
Q

shape of lingual bar

A

half tear shaped like posterior bar on the maxillary arch

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19
Q

lingual bar description

A
  1. most common – used unless cannot use
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20
Q

lingual bar implication with tissue and distance?

A

the superior margin is 3 mm FROM FREE GINGIVAL MARGIN - at a minimum

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21
Q

lingual bar width

A

3 mm at least

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22
Q

lingual bar requires what space? compared to maxillary?

A

6 mm fold depth – so during tongue movement

  • needs to be 3 mm away from free gingival margin and the width is 3 mm
  • so need 6mm IN FUNCTION

maxillary is 6 mm from the free gingival margin

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23
Q

shape of lingual bar

A

1/2 tear shaped with bulk inferior

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24
Q

difference between maxillary and mandibular partials in terms of tissue

A

mandibualr needs tissue releif

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25
use of lingual blanket (7)
1. do not have 6 mm in function 2. non operable lingual tori 3. increase distribution of occlusal load 4. shallow floor 5. high lingual frenum 6. questionable prognosis 7. splinting a week teeth
26
contact with a lingual blanket?
contacts the teeth but not the gingiva
27
what does a lingual blanket require?
rest seats on all lower anteriors -- distribution of the occlusal load
28
inferior border of a lingual blanket?
still needs to be compatible with tongue movement - so at a depth that is compatible with this (does not follow same rule as 6 mm in function as the lingual bar)
29
maxillary and mandibular reltionship to soft tissue and why
1. maxillary CONTACTS TISSUE 2. mandibular is RELIEVED from tissue this is because there are differences in tissue type and tissue movement
30
What do we do to maxillary casts to ensure more contact?
we score it and bead it
31
beading use?
only on maxillary and we do this everywhere where we do not have a finish line - kind of like mini post dams to better adaption - better adaption - better contact for major connectors * * do not want too tight
32
relief wax relationship to upper and lower partials?
LOWER *** - need to relieve the tissue on mandibular partial s - 28/ 30 gauge - very thin but we need it
33
over seating on mandibular?
rest and rest seats hold the framework are not perfect then and impinges on pt. tissue -- not good
34
what do we do about tori
rule of thumb - we never ever put over tori most can be restored around them - so design - acrylic can go over
35
if tori far posterior on maxilla?
have to use horshoe because posterior bar / metal cannot go over tori only acrylic can be placed over tori
36
mandibular tori present tx of choice?
1. surgical removal (most of the time lingual bar cannot be placed with tori present) 2. lingual bar mandibular tori generally interfere with the inferior border of the connector - if un-operable then we choose lingual blanket if it can be avoided
37
lingual tilt implication on lower maor connectors
major connector may interfer with the tongue - also may be too far from the lingual tissue * need to bring surveyor to the lingual as well
38
order of clasp selection for distal extension rotating partial is?
1. RPI 2. Combo 3. Bar 4. RPA cast
39
definition of finish line
a butt joint (90 degrees) at junction of metal and acrylic where major connector meets the denture base - prevents leakage at their interface
40
components of finish line
internal and external external - finish line is from a plastic pattern internal - finish line is from a wax spacer
41
which finish line is never used with a tissue stop
tooth to tooth | - these finish lines are for tooth borne spaces only
42
the three types of finish lines
1. tooth to fold 2. tooth to notch 3. tooth to tooth
43
tooth to fold finsih line use?
for lower distal extensions major connectors
44
tooth to notch finish line use?
for upper distal extension major connectors
45
tissue stops in relation to tuberosity or retro molar pads?
tissue stops end just before the start of the tuberosity and the retromolar pad - should NOT end directly on top of them
46
use of tissue stops on the maxilla?
optional - this is because the major connector contacts the palate - it is dependent on the size and rigidity of the maxillary major connector
47
use of tissue stops on the mandible
required -- the mandibular major connector is releived from the mandibular tissues - only part of the distal extension that will contact the tissue
48
what do single tooth spaces often need?
since they have less surface area - and thus less are to chemically bond to a denture they may require aditional MECHANICAL REINFORCEMNT against the occlusal forces
49
single tooth space in the anterior? posterior?
anterior -- steel's facing posterior -- tube tooth
50
clinical steps in steele's facings for anteriors (what you do)
1. mould (you select) -- select the size and mould 2. Mount 3. matrix
51
general steps in making a steele's facing
1. tooth set on articulator 2. matrix made of plaster 3. tooth and matrix sent to lab 4. lab trims tooth and places retentive slot 5. wax up of lingual done with matrix
52
plaster matrix is used for what in steele's facing?
used to position the LABIAL PORTION of facing
53
refractory cast part of what?
labratory steps in setting an anterior steele's facing
54
components to a tube teeth
**for posterior there is a NAIL HEAD on the meshwork the tooth is hollow ground on the under-surface and goes over the nail head
55
slots are placed where for tube teeth
on the two proximal sides
56
how are facings added
by cementation or curing
57
how are tube teeth added?
added during processing
58
T/F the approach arm and nail head can occupy the same space
TRUE
59
how do you notify lab for a steele's facing
add it to the MODIFICATIONS list - only tooth on there we need to note for modifications
60
what do we draw on paper? on cast (3-D)? why important?
on paper - tx plan record - lab prescription ``` on cast (3-D) - exact location for frame fabrication ``` * know the exact location of framework and where undercuts are
61
outline of major connector is scored to create what?
create a BEAD which maintains the tissue contact | - maintains the POSITIVE tissue contact w/ the palate on the MAXILLA
62
drawing must avoid what?
the rugae
63
what is the importance of drawing finish lines
a finish line "captures" the acrylic and encloses the acrylic with a metal 'fence"
64
which types of finish lines are upper only? lower only? both?
tooth to tooth = both / either tooth to fold = lower only tooth to notch = upper only (like at the hamular notch)
65
describe the full palatal coverage finish line
1. has 3-sided finish line 2. each side begins as a tooth-to-notch line - which goes half-way to the notch 3. then both sides are joined across the palate
66
when do you add the meshwork to your drawing?
after the finish lines are drawn | - is added to the finish line drawing in the form of attachment "loops"
67
how are facings drawn?tube teeth?
they are drawn like CINGULUM RESTS tube teeth are drawn as a side-ways "T"
68
when drawing clasps where do they begin and end?
begin - at retentive tip end - at point of origin
69
what is the sequence of drawing?
F - finish lines and tube teeth R - Rests and steele's facings M - Major connector C - Clasps

Partial Dentures (9 decks)

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