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P2 > L 3&4 > Flashcards

L 3&4 Flashcards

1
Q

it is the application of mechanical principles on biological tissues while studying the biology from a functional viewpoint and then using these principles to design a stable prosthesis

A

BIOMECHANICS

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2
Q

an application of the principles of engineering design as implemented in living organisms

A

BIOMECHANICS

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3
Q

the RPD and their associated structures are subjected to various forms of stress; their ability to resist those stresses depends on:

o _____, ______, ______ and _____ of the stress
(force) being applied onto the denture and denture
bearing areas

A

direction, duration, magnitude, frequency

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4
Q

types of resistance generated:

A

o tooth-based
o tooth- and tissue-based

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5
Q
  • displacing force
  • dislodging force

A. vertical
B. horizontal
C. torsion

A

A

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6
Q

contributes mainly to resisting horizontal stress (direct retainers)

A

Tooth-Based Resistance

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7
Q

contributes to resisting vertical stress and torsion (major connectors and indirect retainers)

A

Tooth-Tissue Based Resistance

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8
Q

Fulcrum is located in the middle in between the load and the exerted effort.

A

CLASS I LEVER

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9
Q

Resistance is positioned in the middle in between the fulcrum and the exerted effort.

A

CLASS II LEVER

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10
Q

Exerted effort is applied in the middle in between the fulcrum and the resistance.

A

CLASS III LEVER

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11
Q

o unification of the major parts of the prosthesis

o distribution of the applied force throughout the arch to
selected teeth and tissue

o minimization of torque to individual teeth

A

MAJOR CONNECTOR

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12
Q

T/F

a rigid major connector limits movement possibilities by acting as a counteracting layer (cross-arch stability) that helps to resist displacement by functional stresses

A

T

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13
Q

Major connectors is made of?

A

Alloy

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14
Q

half pear shape, located above moving tissue but as far below the gingival tissue as possible

A

LINGUAL BAR

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15
Q

located at least 4 mm inferior to gingival margin and farther if possible

A

LINGUAL BAR

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16
Q

this major connector should be contoured with no presence of
sharp margin or any angular form to prevent irritation and
annoyance

A

LINGUAL BAR

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17
Q

superior border should be tapered towards the gingival tissue
superiorly with its greatest bulk of the inferior border

A

LINGUAL BAR

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18
Q

inferior border should be slightly rounded when the framework
is polished

A

LINGUAL BAR

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19
Q

INDICATION
→ when sufficient space exists between the slightly elevated alveolar lingual sulcus and the lingual gingival tissue

A

LINGUAL BAR

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20
Q

LINGUAL BAR

Use an individual impression tray for which lingual borders are ______mm short of the elevated floor of the mouth and then use an impression material that will permit the impression to be accurately molded as the patient licks the lips.

A

3 mm

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21
Q

should be made as thin as possible

A

LINGUOPLATE

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22
Q

upper border should follow the natural curvature of the
supracingular surfaces of the teeth and should not be located
above the middle third of the lingual surfaces

A

LINGUOPLATE

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23
Q

all gingival crevices and deep embrasure must be blocked out
parallel to the path of placement

A

LINGUOPLATE

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24
Q

apron is closely adapted to the teeth extending into
non-undercut interproximal embrasures resulting in scalloped form

A

LINGUOPLATE

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25
Q

INDICATION
→ when the alveolar lingual sulcus closely approximates the lingual gingival crevices

A

LINGUOPLATE

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26
Q

residual ridges in Class I arch have undergone such vertical resorption that offers minimal resistance to horizontal rotations

A

LINGUOPLATE

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27
Q

INDICATION

→ for using periodontally weakened teeth in group functions to support the prosthesis
→ overlapped anterior teeth

A

LINGUOPLATE

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28
Q

when the future replacement of one or more incisor teeth will be
facilitated by the addition of retention loops to an existing linguoplate

A

LINGUOPLATE

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29
Q

barshaperemainsthesameasthatofalingualbar

A

SUBLINGUAL BAR

30
Q

when the height of the floor of the mouth in relation to the free gingival margin will be less than 6 mm

A

SUBLINGUAL BAR

31
Q

if it is desirable to keep the free gingival margin of the remaining anterior teeth exposed and depth of the floor of the mouth is inadequate to place a lingual bar

A

SUBLINGUAL BAR

32
Q

CONTRAINDICATION
→ remaining anterior teeth severely tilted towards the lingual

A

SUBLINGUAL BAR

33
Q

CONTRAINDICATION

→ interfering lingual tori
→ high attachment lingual frenum

A

SUBLINGUAL BAR

34
Q

CONTRAINDICATION

interference with elevation of the tongue during functional
movement

A

SUBLINGUAL BAR

35
Q

shaped and located same as lingual bar

A

LINGUAL BAR WITH CONTINUOUS BAR

36
Q

thin, narrow 3 mm metal strap located on the cingula of the
anterior teeth, scalloped to follow interproximal embrasure with
inferior and superior borders tapered to tooth surfaces

A

LINGUAL BAR WITH CONTINUOUS BAR

37
Q

originates bilaterally

A

LINGUAL BAR WITH CONTINUOUS BAR

38
Q

INDICATION
→ when linguoplate is indicated but the axial alignment of anterior teeth is such that excessive black out of interproximal undercuts would be required

A

LINGUAL BAR WITH CONTINUOUS BAR

39
Q

INDICATION

wide diastema exists between mandibular anterior teeth and linguoplate would objectionably display metal in front view

A

LINGUAL BAR WITH CONTINUOUS BAR

40
Q

located on or slightly above the cingula of the anterior teeth may be added to the lingual bar or can be used independently

A

CINGULUM BAR

41
Q

INDICATION
→ when lingual plate or sublingual bar is indicated but the axial alignment of the anterior teeth is such excessive blockout of interproximal undercuts would be required

A

CINGULUM BAR

42
Q

CONTRAINDICATION
→ anterior teeth severely tilted lingually

→ wide diastema exist between the mandibular anterior teeth and
the cingulum bar would objectionably display metal in front view

A

CINGULUM BAR

43
Q

this concept is incorporated in the Swing-Lock design which consist labial or buccal bar that is connected to the major connector by a hinge at one end and a latch at the other end

A

LABIAL BAR

44
Q

→ support is provided by multiple rests on the remaining natural teeth

→ retention is provided by a bar type retentive clasps with arms contacting the infrabulge areas on the labial surface

A

LABIAL BAR

45
Q

INDICATION
→ lingual inclinations of remaining mandibular premolar and incisor teeth cannot be corrected

→ severe lingual tori cannot be removed

→ severe and abrupt lingual tissue undercuts

A

LABIAL BAR

46
Q

CONTRAINDICATION
→ poor oral hygiene
→ presence of shallow or buccal vestibule
→ high frenal attachment

A

LABIAL BAR

47
Q

INDICATION OF THE SWING-LOCK CONCEPT
→ missing key abutments
→ unfavorable tooth contours
→ unfavorable soft tissue contours
→ teeth with questionable prognosis

A

LABIAL BAR

48
Q

→ cast framework material is distributed in 3 planes
→ should not be used to connect anterior replacements with distal
extension bases

A

SINGLE PALATAL STRAP

49
Q

should have to be objectionably bulk to resist torque and
provide vertical support and horizontal stabilization but this
could interfere with speech

A

SINGLE PALATAL STRAP

50
Q

strap should be 8 mm wide or approximately as wide as the
combined width maxillary premolar and first molar

A

SINGLE PALATAL STRAP

51
Q

confined with an area bounded by 4 principal rests

A

SINGLE PALATAL STRAP

52
Q

NDICATION
→ bilateral edentulous space of short span in a tooth-supported restoration

A

SINGLE PALATAL STRAP

53
Q

relatively broad 8-10 mm

A

ANTERIOR-POSTERIOR STRAP

54
Q

anterior part of the palatal strap located as far as possible to
void rugae and tongue interference

A

ANTERIOR-POSTERIOR STRAP

55
Q

INDICATION
→ Class I and II arches in which excellent abutment and residual ridge and direct retention can be made without indirect retention

→ long edentulous span in Class II, Mod 1 arches

A

ANTERIOR-POSTERIOR STRAP

56
Q

Class IV arches which anterior teeth must be replaced with RPD

A

ANTERIOR-POSTERIOR STRAP

57
Q

inoperable palatal tori that does not extend posteriorly to the
junction of soft and hard palate

A

ANTERIOR-POSTERIOR STRAP

58
Q

covering 2⁄3 of the palate

A

PALATAL PLATE

59
Q

anterior border follows the valleys between rugae and does not
extend anteriorly to indirect retainers on the first premolar

A

PALATAL PLATE

60
Q

INDICATION
→ Class I arch, remaining abutment is canine or first premolar
→ excessive vertical resorption
→ no palatal tori

A

PALATAL PLATE

61
Q

ADVANTAGES
→ uniform thinness and thermal conductivity of metal makes readily acceptable to tongue and underlying tissues
→ corrugation in the anatomic replica adds strength to the casting
→ surface irregularities are intentional therefore electrolytic
polishing is all that is needed
→ greater retention

A

PALATAL PLATE

62
Q

→ least desirable maxillary major connector
→ it should never be used arbitrarily
→ results to gingival irritation and periodontal damage

A

U-SHAPED PALATAL CONNECTOR

63
Q

INDICATION
→ when a large inoperable palatal torus exist
→ several anterior teeth are to be replaced

A

U-SHAPED PALATAL CONNECTOR

64
Q

PRINCIPAL OBJECTIONS
→ lack of rigidity
→ fails to provide good support and permits impingement of
underlying soft tissue
→ need of increase thickness that results to hindrance to the tongue

A

U-SHAPED PALATAL CONNECTOR

65
Q

→ less than 8 mm in width
→ most widely used and yet the least logical
→ often too thin and flexible or too bulky and objectionable to the
tongue

A

SINGLE PALATAL BAR

66
Q

→ exhibits many of the same disadvantage as the single palatal
bar
→ could be too bulky and interfere with tongue function

A

COMBINATION OF ANTERIOR AND POSTERIOR PALATAL BAR-TYPE CONNECTOR

67
Q

is a term used to denote the scribing of a shallow groove on the maxillary master cast outlining the palatal major connector exclusive of rugae areas

A

beading

68
Q

→ use of cleoid carver
→ care must be exercised to create a groove not larger than 0.5
mm in width or depth

A

BEADING OF MAXILLARY CAST

69
Q

serves as the connecting link between major connector or the base of a RPD and other components of the prosthesis

A

MINOR CONNECTOR

70
Q

functions:
o transfer functional stress to the abutment teeth
o transfer the effects of retainers, rests and stabilizing
components throughout the prosthesis

A

MINOR CONNECTOR

P2 (6 decks)

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