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Removable Spring > 2. > Flashcards

2. Flashcards

1
Q

Describe the difference in impression techniques between tooth supported and tooth tissue supported dentures

A

Tooth= Regular impression

Tooth tissue= selective pressure impression

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2
Q

T/F All the support for a kennedy class III and IV denture comes from the teeth

A

t

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3
Q

where does support for the denture come from

A

the rests

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4
Q

Most ideal places for rest seats are

A
  • Occlusal
  • Cingulum
  • Incisal
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5
Q

What criteria are evaluated when determining the amount of support that can be provided by an abutment tooth

A
  • Perio health
  • Crown:root
  • Crow to root morphologies
  • Bone index area (how tooth has responded to previous stress)
  • Location of the tooth in the arch
  • Relationship of the tooth to other support units (length of edentulous span
  • Opposing dentition
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6
Q

What criteria are evaluated when determining the amount of support that can be provided by the ridge for a tooth tissue supported partial

A
  • quality of ridge
  • Extent of ridge coverage
  • type and accuracy of impression
  • accuracy of denture base
  • design of partial components
  • occlusal load
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7
Q

Functions of minor connectors

A
  • Join RPD parts
  • Transfer stress from one abutment across the entire arch
  • Transfer the effects of retainers, rests and stabilizing components throughout the prosthesis
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8
Q

T/F Latticework is a minor connector

A

t

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9
Q

Latticework extends _ up the length of an edentulous ridge

A

2/3

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10
Q

Keys to successful clasp design

A
  • Avoid direct transmission of tipping or torquing forces on abutment
  • Definitive locate component parts correctly on abutment tooth
  • Provide retention against dislodging forces
  • Compatible with undercut location, tissue contour and esthetic contour and desires
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11
Q

what is the most important single factor is clasp selection

A

location of undercut

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12
Q

Difference between internal and external finish lines

A

external <90 degrees and internal is 90

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13
Q

The junction of the major and minor connectors at the palatal finishline should be located where

A

2 mm medial to a line that connects the lingual surfaces (cusps) of the missing posterior teeth

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14
Q

What are the six different mandibular major connectors

A
  • Lingual bar*
  • Lingual plate*
  • Sublingual bar
  • Lingual bar with cingulum bar
  • Labial bar
  • Cingulum bar
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15
Q

Indications for lingual bar

A

-Need 8 mm between gingival margin and alveolar lingual sulcus depth

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16
Q

The inferior border of the lingual bar should be located where

A

at the height of the alveolar lingual sulcus

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17
Q

Shape of lingual bar is

A

half pear

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18
Q

superior boarder of lingual bar is located where

A

4 mm from gingival margin

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19
Q

Lingual plate indications for use

A

-Not enough space for a lingual bar
-Class I with excessive vertical resorption
-Periodontally weak teeth
Future replacement of teeth

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20
Q

Lingual plate may lead to what adverse effects

A
  • decalcification of enamel

- irritaiton of soft tissues with poor OH

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21
Q

Superior boarder of the lingual plate is from

A

cingulum up to the interproximal contacts

22
Q

Which is better for evasion of lingual tori lingual (bar/plate)

A

plate

23
Q

What are the stress releasing clasps

A
  • All infrabuldge clasps (T bar, 1/2 T and I-bar)

- Combination clasp

24
Q

Advantages of RPI

A
  • Esthetic
  • Decreased torquing of abutment tooth
  • Less chance of accidental distortion resulting from proximity to denture border
25
Q

Contraindications of RPI

A
  • Soft tissue undercuts
  • Shallow vestibule (need 3 mm from gingival margin)
  • Severe lingual tilt (no buccal undercut)
  • Undercut on DB (use T bar)
26
Q

Advantages and disadvantages of 1/2 t bar

A

Advantages

  • Esthetic
  • Less coverage of abutment

Disadvantage
-Less bracing/stability

27
Q

Combination clasp includes

A
  • distal rest
  • reciprocating arm
  • wrought wire clasp
  • proximal plate
28
Q

Advantages of WW clasp

A
  • Round (flex in all directions)
  • Minimal surface contact
  • can use in larger undercut (0.02 inch)
  • Stress releasing
29
Q

6 major types of maxillary major connectors

A
  • Palatal strap
  • Anterior and posterior palatal strap *
  • Palatal plate *
  • U-shaped (horseshow)
  • Palatal bar
  • Anterior-posterior palatal bars
30
Q

Palatal plate covers how much of the hard palate

A

1/2 or more

31
Q

Indications for complete palatal plate

A
  • Only some anteriors remain
  • Class II with large posterior mod space or missing anteriors
  • Class I Poor abutment support
  • extreme vertical ridge resorption
  • Absence of torus
32
Q

Complete Palatal plate contacts what teeth

A

all natural teeth in remaining arch

33
Q

Posterior border ends where

A

junction of hard and soft palate into the hamular notch

34
Q

Relation of the palatal plate termination point and the medial suture

A

perpendicular to one another

35
Q

Indications for palatal plate

A
  • Class I with little vertical resorption
  • V or U shaped palatal vault
  • Strong abutments
  • More than 6 remaining anteriors in arch
  • Direct retention not a problem
  • No tori
36
Q

Indications for anterior-posterior palatal strap

A
  • Class I and II with excellent abutments and ridge support
  • Class IV arch
  • Inoperable torus that don’t extend posterior to the junction of the hard and soft palate
37
Q

How broad are the anterior and posterior palatal straps

A

8-10 mm

38
Q

How broad at the lateral palatal straps

A

7-9 mm

39
Q

What is the anterior extent of the AP strap

A

the most anterior rests

40
Q

Circumferential claps are commonly used on (tooth/tooth tissue) supported partials

A

tooth

41
Q

Circumferential clasps are most commonly used where in the arch

A

where there is no edentulous space (aka embrassure clasp)

42
Q

Palatal strap should be a t least _mm wide

A

8

43
Q

Palatal stap commonly used for what kennedy class arches

A

II and III

44
Q

Disadvantage of a palatal bar

A

bulky

Little vertical support from palate

45
Q

Where can’t a palatal bar be placed

A

anterior to the 2nd PMs (interferes with tongue function when more anterior)

46
Q

Indication for palatal bar

A

-1-2 teeth missing on each side (posterior to PMs )

47
Q

What is the least favorable maxillary major connector and why

A

horseshoe … lacks rigidity

48
Q

Horseshoe indicated for

A

prominent median palatine suture or inoperable torus

49
Q

Horseshoe connector contraindicated in

A

Class I and II arch

50
Q

Factors influencing design

A
  • Preservation of teeth and perio
  • Minimal tooth and gingival coverage
  • Nature of support, tooth borne or tooth mucosa borne
  • Anatomic limits (torus)
  • Tooth inclination, position and contour
  • Contingency planning
  • Potential magnitude of applied forces
  • Ease of placement and removal
  • Esthetics

Removable Spring (8 decks)

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