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ABGD study > Fixed Prosth- ABGD > Flashcards

Fixed Prosth- ABGD Flashcards

1
Q

What are the implant space requirements for denture locators?

A

8-10 mm
Locator- 3-3.5
acrylic: 2mm
abutment cuff: 3mm

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2
Q

Overdenture with bar implant space rewuirement?

A

> 12mm

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3
Q

What is the space rewuirement for hybrid dentures?

A

> 15mm (10-12)

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4
Q

What is the space requirement for fixed implant?

A

8-12mm

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5
Q

What is the space requirement for cement retained implant?

A

8mm

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6
Q

What are the indications for tooth replacement?

A

Form
Function
Occlusal stability
Esthetics
Phonetics

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7
Q

What are diagnostic casts used for?

A

dx and tx planning, dx wax up, reduction and provision matrix fabrication, visualization of the anatmy and restorations, dx preparations, analysis of space and edentulous areas

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8
Q

What are the requirements of diagnostic cast mounting?

A
  1. accurate casts
  2. semi adjustable articulator
  3. facebow
  4. interocclusal records
  5. program the articulator- condyler inclination at 30 and bennet at 15
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9
Q

What does chemical erosion look like?

A

occlusal cupping, roun margins, lesions dont match ofpposing, islands of restorations, unstained and sensitive.

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10
Q

If you see a lot of wear on the L of the maxillary what are you thinking?

A

chronic regurgitation

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11
Q

what does occlusal wear look like?

A

wear facets, increased wear in the ant, restorations and teeth wear the same, think parafunction?

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12
Q

What is accuracy?

A

trueness(most like reality) +precision (consistently of results)

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13
Q

What does a brush/paste misuse look like?

A

sand blasted, wear on Canine and premolars

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14
Q

What is more accurate VPS or omnican?

A

very close, but VPS

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15
Q

what is more accurate for implant pick up

A

digital scan

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16
Q

What are the 7 purposes of diagnostic mounting?

A
  1. simulation of mandibular movement
  2. Analysis of occlusal plane
  3. Analysis of OCCLSUION and DISCLUSION
  4. Visualization of anatomy and restorations
  5. Diagnostic preparations
  6. Analysis of restorative SPACE
  7. Analysis of EDENTULOUS AREAS
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17
Q

What are the 5 diagnostic mounting requirements?

A
  1. Accurate casts
  2. SEMI-Adjustable articulator
  3. Facebow transfer record
  4. CR interocclusal records-bite reg
  5. Program articulator via condylar inclination and bennett angle
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18
Q

Alginate setting time is best controlled with?

A

water temp

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19
Q

What increases as the alginate sets (more time)?

A

tear strength and resistance to deformation

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20
Q

What is the best way to ensure full set of alginate?

A

use a timer

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21
Q

How much time does alginate require to set?

A

2-3 mon after initial set (loss oc tackiness)

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22
Q

What happens to alginate when it is removed from undercuts?

A

it is compressed

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23
Q

What will help decrease deformation with alginate?

A

less compression (less undercuts)
less time compressed

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24
Q

What is reasonable bulk for alginate?

A

5-7mm between tray and teeth

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25
Q

Should you increase or decrease the rate of removal to decrease tearing potential of alginate?

A

increase rate of removal “snap” removal

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26
Q

How does changing the water:power ratio affect strength??

A

Increase Water:power = DECREASE of strength

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27
Q

On gypsum casts what and why do they get degraded when sitting in alginate?

A

via syneresis, and with blood, saliva, water(dilutes stone)

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28
Q

What does it look like when stone is diluted by free water in an impression

A

soft and chaulky

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29
Q

What is it called when alginate absorbs water?

A

imbibition

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30
Q

What is it called when alginate shrinks due to loosing water?

A

syneresis- gel filaments contract and squeeze water out

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31
Q

How soon should you pour alginate?

A

ASAP. within 12 min

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32
Q

If you cant pour immedately, how should you store it?

A

in 100% humidity (plastic bag)

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33
Q

Should you ever wrap the alginate in towels or immerse it?

A

no

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34
Q

What is Celenza Class 1?

A

a simple holding device- such as hinge

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35
Q

What is celenza class II?

A

some vertical and horizonal movement - Galetti

although this is capable of excursives, it does not mimic condylar movement

Non-arcon

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36
Q

What is Celenza Class 3A?

A

Semi adjustable that can only accept protrusive records? HANAU

ARCON or Non-

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37
Q

What is Celenza Class 3B

A

semi adjustable- can accept lateral and protrusive records (ie Wipmix)

ARCON or Non-

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38
Q

What is Celenza Class 4a

A

highly adjustable/full adjustable- ARCON
Programmed with engravings

ie: TMJ articulator

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39
Q

Wha is Celenza Class 4b

A

highly adjustable/full adjustable- ARCON
Programmed with customized condylar paths usually pantograph

ie: stuart, Denar D5A

40
Q

What is a facebow used to do (2)?

A
  1. records the spatial relationship of the max arch to 3 anatomic reference points
  2. Transfer this relationship to an articulator
41
Q

What does the facebow record do for mounting?

A

positioned the maxillary cast in relation to the opening and closing axis of the mandible.

42
Q

What are the traditional anatomic references for a facebow? What is it for Whip mix? Hanau?

A
  1. transverse horizonal axis and one other selected point
    Whipmix: Nasion
    Hanau: infraorbital rim
43
Q

How accurate is the Whipmix earbow?

A

75% of the population is within 6mm of the true hinge axis

44
Q

If using a Whipmix facebow- what do you set the condylar inclination at?

A

30 or FB

45
Q

In centric relation what is the condyle position?

A

braced in a superior and anterior position.

Restricted to purely rotary movement about he transverse horizontal axis

46
Q

Why do we use centric relation?

A
  1. repeatable
  2. stability of occlusion
  3. comfortable
  4. avoid eccentric interferences
  5. decrease trauma from occlusion
  6. Class 3 lever
  7. interruption of destructive forces on the joint
47
Q

What kind of lever is the jaw?

A

Class III

48
Q

When should you consider using CR?

A

if multiple (3+) postioer teeth are being restored, or there is evidence of occlusal pathology

49
Q

What are 3 CR techniques?

A
  1. Chin point guidance
  2. bimanual manipulation- Dr. Dawson
  3. Lucia Jig - separating the posterior teeth so that the pterygoid muscle releases, allowing the condyles to be seated in the optimal position
  4. leaf gauge
50
Q

What could you use for programing the articulator?

A

lateral or protrusive records (protrusive is more shallow, and “safer” bc ant wall of fossa is shallower than medial wall of the orbiting condyle)
can also match up wear facets

51
Q

If the inclination on an articulator is steeper, how will that effect cusp creation?

A

cusps can be steeper if inclination is steeper

52
Q

What is the static relationship between the incising or masticating surfaces of the maxillary or mandibular teeth ot teeth analogues?

A

occlusion

53
Q

What is the static and dynamic contact relationship between the occlusal surfaces of the MAX or MAND teeth during function?

A

Articulation

54
Q

What is centric occlusion?

A

the occlusion when the jaw is in CR

55
Q

Which cusps are the stamp cusps?

A

max L
Mand B

56
Q

Which cusps are the sheering cusps?

A

Max B
Mand L

57
Q

What are the advantages of cups to fossa occlusion?

A
  1. forces in line with the long axis of teeth
  2. eliminates the “plunger cusp” effect
  3. Greater stability of the dental arch
  4. less tendency towards tooth mobility
58
Q

What kind of contacts allow for cusp/fossa occlusion?

A

tripodal- each cusp contacts 3 point on the opposing tooth

59
Q

What are the contacts in tripodal contact?

A

B/L Stability: (A, B, C)
M/D stability: closer stoppers and equalizers

60
Q

What are the A contacts? in Bucco -lingual stability

A

Shearing cusps of the maxillary teeth occlude with the stamp cusps of the mandibular teeth (B cusps)

61
Q

What are the B contacts in B/L stability?

A

Stamp cusps of the max teeth occlude with Stamp cusps of Mand teeth

62
Q

What are the C contacts in B/L stability?

A

stamp cosps of max with shearing cupss of mand (L cusps)

63
Q

Is it stable? A+B contacts

A

Stability

64
Q

Is it stable? C+B contacts

A

Stability

65
Q

Is it stable? A+B+C contacts

A

Stability

66
Q

Is it stable? A+C contacts

A

max teeth move buccally, mand move L

67
Q

Is it stable? B contacts only

A

Max teeth move L, Mand teeth move B

68
Q

What is the purpose of closure stoppers?

A

stops the closure of the mandible.
neutralizes forces exerted by equalizers

69
Q

What is arcon vs non-arcon

A

Arcon- condylar element on on lower part
non-arcon- condylar element is max

70
Q

What articulator do you use?

A

Whipmix 4000
semi-adjustable
Arcon
Celenza Class 3b

71
Q

What is condylar inclination and what the the standard setting?

A

angle ofthe condyle translation down the articular eminence, which is either steep or shallow
steep= teeth come back together quickly
shallow- teeth are slower to disclose

Standard is 30 degrees

72
Q

What is the bennett angle and what is the standard setting?

A

Progressive side shit
standard is 10-15

73
Q

How do you take a record for the bennet angle?

A

Obtaining a lateral record is accomplished by having the patient move their jaw to the left and right. At the end of each movement the clinician will use registration material to capture the position which will register the patients Bennett Angle/Lateral Condylar Guidance. This record will be placed between the mounted maxillary and mandibular casts independently to program the lateral setting on the articulator

74
Q

What to do if you have a pier abutment?

A

consider implant or use of a semi-precision (looser) attachment

Male portion= PATRIX= Tennon–> on the MESIAL aspect of the distal Pontic
female portion=MARTRIX=mortise–> on the DISTAL access of the retainer on the pier abutment which acts as a for breaker

75
Q

What is Y-ZTP and what are the benefits/advantages?

A

Yttria-stabilized tetragonal zirconia polycrstal
yittrium oxide is added to zirconia to stabilze the structure and prevent cracking allowing for more tetra phase.

transition from tera to monoclinic creates a 3-5% increase of volume- sleaing the crack.

white color, great physical properties, transformation toughening, cad/cam capable, more accurate milling due to 25% decrease in size post sintering,

disadvantages: opaque, more sintering, questionable bonding, wears if not polished

76
Q

What causes B/L and M/D stability?

A

BL: ABC
M/D equalizers and closure stoppers

77
Q

What are the different types of ceramics?

A

Feldspathic,
Lithium Disilicate
Zirconia
Resin infused ceramics (like enamic)
conventional
CAD/CAM

78
Q

Identify the impression coping…. L=, and R=?

A

Nobel Biocare external hex
L= open tray pick up
R= closed tray pick up

79
Q

Difference between closed and open tray?

A

open = hole cut in ray to unscrew impression copings before removal. Used for multiple implant impressions and eliminates the need to reinsert the impression coping manually after the impression is removed

80
Q

Flexing of the mandible and implant placement- are we concerned about it and why? Where are most forces placed

A

why? damage to the implant, loosening of the parts
most forces are at the crest of the bone

81
Q

Describe MIP. CO, CR

A

MIP: where all the teeth fit together. Maximum intercuspation postion

CO: centric occlusion- occlusion that = CR when the teeth just contact.

CR: most anterior and superior position of the condyle in the fossa(against the slope of the articular eminence) where the disc is thinnest and avascular- max/mand relationship.

82
Q

What is the restorative space for implants for screw retained

A

6-7mm

83
Q

How to you pre-treat feldspathic for seating?

A

5.5% HF x 60 secs
silane, MPS primer, Monobond plus

84
Q

How do you pre-treat lithium disilicate before seating?

A

5.5% HF x 20 secs, then silane, MPS primer, Monobond plus

85
Q

What is mutually protected articulation?

A

The posterior teeth protect the anterior teeth in MIP and the ant teeth protect the post teeth in excursive

86
Q

what are the characteristics of MIP?

A

MIP occurs with condyles in centric relation (no slip from CO to MIP) post teeth hold shim, while Ant teeth drag shim
immediate separation of post teeth in any eccentric movement
Ant guidance- ant teeth provide separation of post teeth in eccentric movements.

87
Q

What is group function?

A

unilateral shared guidence with ant and post.
forces shared among the teeth
no no-working interferences in eccentric movements

88
Q

What is balanced articulation?

A

Simultaneous cross arch contacts in MIP and eccentric movements- indicated for dentures

89
Q

What are the primary determinants of retention?

A

total occlusal convergence: taper 10-22°
-prep height:
Anteriors- 3.0mm
Posteriors - 4.0mm
-Prep height/width ratio: >0.4

90
Q
A
91
Q

What is the ideal and minimum Crown:root ratio

A

ideal: 2:3
minimum: 1:1

91
Q

What re the requirements for a provisional restoration?

A

pulpal protection
positional stability
occlusal function
cleansability
non-impinging margins
strength and retention
esthetics

92
Q

What are the goals of gingival retraction?

A

vertical access for impression materials
horizontal volume for impression material
crevicular fluid control
maintain and protect the periodontium
facilitate axial contour

92
Q

What are ways you can expose the finish line for your crown prep?

A

Retractions: copings, bands, cord, pastes,

Curettage
rotary, electrosurgical, laser

93
Q
A

ABGD study (15 decks)

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