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Operative Dentistry > Occlusion 3 > Flashcards

Occlusion 3 Flashcards

1
Q

What are the different types of articulator we can mount a cast on?

A
  1. Arcon
  2. Average value
  3. Semi-adjustable
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2
Q

Whats the difference between an average value and a semi-adjustable?

A

AVERAGE

  • Bennets angle set at 15
  • Condylar guidance angle set at 30

SEMI-ADJUSTABLE
- Allows you to set the bennet + condylar guidance angles

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3
Q

Where do we mark the anterior reference point for the face-bow? (3)

A
  1. Mark on patients right side using reference plane locator + marker
  2. 43mm apical to the incisal edge of the anterior teeth (12 ideally)
  3. Approximate position of the infraorbital foramen
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4
Q

What relationship does a face-bow record?

A

Relationship of the maxilla to the hinge axis rotation of the mandible

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5
Q

Next step after using face-bow?

A

Mount the maxillary cast in an equivalent relationship on the RCON articulator

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6
Q

What do we need to mount the lower cast?

A

We will need an inter-occlusal regi to mount mandibular cast in relation to maxillary cast already mounted on the articulator using the face-bow transfer

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7
Q

What are the 2 choices of inter-occlusal registration we can use for mounting a lower cast?

A
  1. ICP position
    - Maximum intercuspation
    - Comfortable bite
  2. RCP
    - Reorganised approach
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8
Q

What is an interocclusal regi?

A

How the teeth meet together

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9
Q

How do we record ICP regi if the ICP is:

NOT obvious to tech

A

Wax wafer or paste

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10
Q

How do we record ICP regi if the ICP is:

Obvious to tech

A

No material needed between teeth to accurately mount the casts

Plenty of tooth contacts

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11
Q

How do we record ICP regi if the ICP:

Has a Free End Saddle

A

Record block needed

- Casts cant be hand articulated

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12
Q

Contraindication for using too much wax in wax wafer/registration paste (3)

A
  1. OVD will be increased
  2. Restoration will be high in the bite when placed
  3. When using wax must ensure it is thin + cusp tips are visible
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13
Q

What are our registration position options? (2)

A

RCP

ICP

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14
Q

RCP recrganised approach

A

RCP regi with/without OVD increase

NOT SIMPLE

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15
Q

ICP reorganised approach

A

ICP regi with OVD increase

NOT SIMPLE

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16
Q

Conformed approach

A

ICP regi without OVD increase

SIMPLE

17
Q

What is the conformative approach defined as?

A

The provision of restorations in harmony with the existing jaw relationships

Means occlusal contacts of the other teeth should remain unaltered from the new restorations occlusion

18
Q

When do we NOT use the conformative approach? (4)

A
  1. An increase in vertical height is needed to make space for restorations
  2. Tooth/teeth significantly out of position
    - Overerupted
    - Tilted
    - Rotated
  3. A significant change in appearance is wanted
    - Toothwear
    - Short teeth
  4. Hx of occlusal related failure/fracture of existing restorations
    - Something may be wrong with occlusion so change existing occlusal scheme
19
Q

Does the reorganised approach change the occlusion?

A

Provides restorations which change the occlusion but are well tolerated by the patient

20
Q

When would we want to use the reorganised approach? (2)

A
  1. ICP is non-existent or no use

2. You need space to place restorations

21
Q

How do we find the retruded contact position?

A
  1. Patient guided into a terminal hinge closure to detect where initial tooth contact occurs (RCP)
22
Q

Techniques used to find RCP (3)

A
  1. Bimanual manipulation
  2. Chin point guidance
  3. Chin point guidance with anterior jig
23
Q

What materials can be used to register RCP registration?

A
  1. Wax
  2. Paste
  3. Record block
24
Q

When restoring anterior teeth:

What do we do about guidance?

A
  1. Copy the existing guidance
    - Simple
    - Conformative
    - Most often
  2. Change guidance
    - Not simple
    - Reorganised
    - Less often
25
Q

Occlusal analysis checklist (9)

A
  1. TMJ function + MOM activity
  2. Incisor relationship
  3. Molar relationship
  4. Xbites
  5. Guidance
  6. Wear facets/severity of tooth wear
  7. Resto fractures
  8. Occlusal contacts
  9. Working/non working side contacts

Operative Dentistry (6 decks)

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