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T1 Mid-Year Oral Boards > Classification Standards > Flashcards

Classification Standards Flashcards

1
Q

Predominantly Base Alloys

A

Noble Metal Content <25%

gold + platinum group

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2
Q

Noble Alloys

A

Noble Metal Content >=25% (gold + platinum)

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3
Q

Titanium/Ti Alloys

A

Titanium >= 85%

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4
Q

High Noble Alloys

A

Noble Metal Content >= 60% and gold >= 40%

Noble metal content means gold + platinum

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5
Q

Noble Metal Content group is what elements?

What about the subgroup?

A

Gold + Platinum group

Platinum, palladium, rhodium, indium, osmium, ruthenium

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6
Q

Swenson’s Formula (for tooth selection)

A

Cusp Angle = Incisal Guidance + 1/2 (Condylar Guidance - Incisal Guidance)

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7
Q

Theilman’s Formula

Balanced Occlusion (C) =…

A

C = Condylar Inclination x Incisal Guidance / Occlusal plane x cusps inclination x Comp curve

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8
Q

If you adjust the condylar guidance, what impact can this have on occlusal form of restorations?

A

Cusps may be taller or shorter (Vertical)

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9
Q

Adjusting inter condylar distance will have what impact on occlusal form?

A

The greater the distance, the smaller the cusp grooves and fossa will have to be.

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10
Q

Adjusting anterior guidance will have what impact on occlusal form?

A

Posterior cusps may be taller or shorter (vertical)

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11
Q

Adjusting the plane of occlusion will have what impact on occlusal form?

A

The flatter the plane of occlusion, the shorter the posterior cusps will be (vertical)

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12
Q

Adjusting the curve of spee will have what effect on occlusal form?

A

Vertical (the greater the curve, the taller the cusps can be)

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13
Q

Lateral translation adjustment will have what effect on occlusal form?

A

The greater the translation, the wider the cusp grooves and fossa will have to be

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14
Q

Horizontal determinants of occlusion (4)? How does adjusting each affect occlusal form?

A
  1. Distance from rotating condyle
  2. Distance from midsagital plane
  3. Lateral translation movement
  4. Intercondylar distance
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15
Q

Vertical determinants of occlusion (5)? How does adjusting each affect occlusal form?

A
  1. Condylar guidance
  2. Incisal guidance
  3. Occlusal plane
  4. Curve of spee
  5. Lateral translation movement
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16
Q

What is the third point of reference for articulators?

A

It is used to complete the plane of condylar position and determine the occlusal plane on the articulator

17
Q

Frankfort Horizontal plane - what landmarks?

A
  1. Orbitale

2. Porion

18
Q

Ala-tragus line (camper’s plane)

A
  1. Inferior border of ala

2. Superior border of tragus

19
Q

Centric Relation

A

Maxillomandibular position in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the most anterior-superior position against the shapes of the articular eminence.

20
Q

MIP

A

Complete intercuspation of all teeth independent of condylar position

21
Q

When do you restore in MI or CO?

A

Restore in MI when patient is satisfied with bite and no occlusal dysfunction. Restoration is only a one or a few teeth
CO - Redesign to ideal occlusion - an increase in OVD planned

22
Q

Alginate impression reaction

A

H2O + Potassium alginate + Calcium sulfate + (Sodium phosphate) -> Calcium alginate + calcium phosphate

23
Q

Gypsum reaction

A

Calcium sulfate dehydrate _ heat -> calcium sulfate hemihydrate (from 2 H2O down to 1/2)

24
Q

How thick is die spacer? What is it’s role?

A

20-40 microns

Provides space for cement and improves seating.

25
Q

Fixed - Retention form factors (5)

A
  1. Total occlusal convergence
  2. Base/height ratio
  3. Surface area
  4. Effect of grooves/boxes
  5. Cement
26
Q

Fixed - Resistance form factors (5)

A
  1. Total occlusal convergence
  2. Base/height ratio
  3. Tooth location
  4. Grooves/boxes
  5. Cement
27
Q

Fixed - Goodacre prep recommendations

  • How much TOC?
  • Prep height for anteriors
  • Prep height for posteriors
  • Height/base ratio
  • What about line angles?
  • What about surface roughness?
A
  1. 10-20 TOC
  2. 4 mm anteriors
  3. 3 mm posteriors
  4. 0.4 ratio
  5. Facial/lingual - proximal line angles need to be preserved
  6. Smooth tooth surfaces enhance fit
28
Q

Irreversible hydrocolloid - 5 components

A
  1. Potassium alginate
  2. Calcium sulfate dehydrate
  3. Diatomaceous earth
  4. Potassium sulfate
  5. Trisodium phosphate
29
Q

What is the retarder in irreversible hydrocolloid?

A

Trisodium phosphate

30
Q

What does Diatomaceous earth do in irreversible hydrocolloid reaction?

A

Improves consistency and flexibility

31
Q

Polyether - Composition (5)

A
  1. Base (polyether, silica filler, plasticizer)

2. Accelerators (sulfonate and thickening agent)

32
Q

Polyether - Adv/Disadv

  • Dimensional stability
  • Water tolerance
  • Tear strength
  • Rigidity
  • Single or multiple pours?
  • Uses?
A
  1. Good dimensional stability
  2. Hydrophilic
  3. Poor tear strength
  4. Rigid
  5. Multiple pours
  6. Implants, fixed
33
Q

Polysulfide - Composition

A

Polysulfide, lead dioxide (accelerator), titanium dioxide (filler), dibuthyl phthalate (plasticizer for viscosity), oleic acid (retarder)

34
Q

Polysulfide - Reaction theory

A

In the presence of accelerator (lead dioxide), the polysulfide polymers undergo chain linking at the thiol group

35
Q

The three elastomeric materials we use in dentistry?

A

Polyether, polyvinylsiloxane, polysulfide

36
Q

Condensation Silicone or Addition produces ethyl alcohol? Which produces hydrogen gas?

A

Condensation produces ethyl alcohol. This accounts for the shrinkage.

Addition silicone (PVS) produces hydrogen gas)

37
Q

How do manufacturers account for hydrogen gas production in addition silicone?

A

Palladium as a scavenger

T1 Mid-Year Oral Boards (1 decks)

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