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Prosth > Prosth - Occlusion 1 > Flashcards

Prosth - Occlusion 1 Flashcards

1
Q

3 static occlusal relationships

A

MIP
CR
CO

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2
Q

MIP

A
  • complete intercusp of teeth independent of condyle
  • best fit of teeth regardless of condylar position
  • “T” only
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3
Q

CR

A
  • art with thinnest vascular portion of disk
  • most anterior-superior postion
  • independent of tooth contact
  • purely ROTATIONAL movement of MN
  • “J” only
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4
Q

CO

A
  • occlusion when Mn is in CR
  • note: this may OR may not be same as MIP
  • “J” & “T”
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5
Q

what are the dynamic occlusal movements?

A
  1. protrusion
  2. lateral excursive
    • working: lateral move of Mn away from the Mx midline
    • non-working; toward Mx midline
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6
Q

what type of movement is “working”? rotational or translational?

A

rotation

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7
Q

what type of movement is “non-working”? rotational or translational?

A

translational

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8
Q

Angle Classification is a system of occlusion based on the interdigitation of which class/type of tooth

A

first molars

- this is also known as “anteroposterior classification”

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9
Q

what is the “fancy name” for the following:

  • Class I
  • Class II
  • Class III
A

1 - neutrocclusion
2 - distocclusion
3- mesiocclusion

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10
Q

there are 2 divisions of distocclusion - what are they and what are the maxillary central incisor relationships for each

A

Division 1 - “buck teeth” = protrusion of 8/9
Division 2 - (A) retruded 8/9
(B) cross overlap of 7/10, &
(C) excessive vertical overlap

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11
Q

what are the morphological characteristics of an ideal occlusion in the following “planes”:

(1) anteroposterior
(2) vertical
(3) transverse

A

(1) AP plane:
- 2-4mm horizontal overlap
- Angle Class I of posterior teeth
(2) Vert Plane:
- vertical overlap of anterior teeth: 30-50%
(3) Transverse Plane:
- midlines aligned
- post. teeth w/ normal Bu Overjet
- post. teeth w/ good cusp to fossa

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12
Q

The functional characteristic of ideal occlusion?

A

mutually protected occlusion

weird ? — see slide 18

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13
Q

mutually protected occlusion is an occlusal scheme in which the ________ teeth prevent excessive contact of the _________ teeth when in MIP — AND —– when the _______ teeth disengage the _________ teeth in all Mn excursive movements

A

posterior prevent anterior

anterior disengage posterior

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14
Q

6 bullet points about Mutually protected occlusion

A
  1. simultaneous contact of post teeth
  2. axial loading of post teeth
  3. light contact of anterior teeth
  4. working - no posterior disocclude canines
  5. protrusive - anteriors disocclude posteriors
  6. non-working - no contacts at all
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15
Q

what are the 5 non-ideal occlusal relationships or ‘variations’?

A
  • cross bite
  • arches are diff sizes
  • occ. plane disrupted
  • ant. open bite
  • unfavorable functional contacts
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16
Q

there is a “scheme” of excursive guidance (5 of them). when doing a restoration, you should move the guidance scheme towards the top of the spectrum. List the “spectrum” in order.

A
  1. canine guidance (ideal)
  2. group function (think of worn down anteriors)
  3. posterior guidance (think of an open bite)
  4. fully balanced
  5. non-working guidance (Mn larger than Mx)
17
Q

Occlusal Equilibration (6 bullet points to remember)

A
  • want max # of post. holding contacts
  • there will be a slight decrease in VDO (vertical dimension occlusion)
  • never grind the teeth ‘out of contact’
  • keep contacts off of inclined planes
  • try for (want) canine guidance
  • during protrusion:
    • make even over as many ant. teeth as possible (at least 2 centrals at minimum)
    • no posterior working contacts
    • no non-working contacts
18
Q

there are limitations to achieving Occ. Equilibration - what are they?

A
  • you only have so much enamel thickness to work with (2.0 - 2.5 mm @ cusp and even less at the level of the fossa)
  • restoration that can’t be (shouldn’t be) adjusted
  • position of the teeth
  • skeletal relationship
  • Rule of Thirds (see upcoming flashcard)
19
Q

rule of thirds: if the working cusp of the Mn tooth is “marking” on the lingual third of the Bu triangular ridge of the Mx tooth then what type of treatment can be done to fix occlusion

A

occlusal adjustment with handpiece

20
Q

rule of thirds: if the working cusp of the Mn tooth is “marking” on the middle third of the Bu triangular ridge of the Mx tooth then what type of treatment can be done to fix occlusion

A

restorative treatment

21
Q

rule of thirds: if the working cusp of the Mn tooth is “marking” on the facial third of the Bu triangular ridge of the Mx tooth then what type of treatment can be done to fix occlusion

A

orthodontic treatment is needed to correct

22
Q

equilibration technique things to remember when

A
  • adjustments done in CO (not CR)
  • 1 mm contact diameter desired
  • all should hold shimstock
  • ## adjust lingual of Mx incisors - NOT Mn incisors
23
Q

cusp repositioning

A
  • identify contact on an incline
  • decide which way you want it to move
  • adjust opposite slope of opposing cusp that create that contact
24
Q

when selecting which fossa to “shoot for” = pick central fossae bc its ideal.
- moving contact to the central fossae is ideal… WHY????

A

bc minimizes excursive interferences

25
Q

when repositioning a fossae - what 2 things must you keep in mind?

A
  1. some fossae may not be attainable without major reduction (which could/would probably be bad)
  2. you should try to flatten the incline plane to allow for axial loading (IPM)
26
Q

if your adjustments in CO are still incomplete you can “last resort” to what 2 things:

A
  1. shorten cusp

2. deepen fossae

27
Q

what specific circumstances would lead you to decide to shorten a cusp?

A
  1. if opposing inclines are very steep
  2. if the fossae of a tooth is super deep
  3. you have working/non-working cusp interferences
  4. you have protrusive cusp interferences
28
Q

what technique should you use to reduce a cusp

A

reduce it around the tip…. like sharpening a pencil THEN lightly reduce cusp height. (dont just grind down from start)

29
Q

what specific circumstances would lead you to decide to deepen a fossae?

A
  1. fossae is flat due to a restoration
  2. posterior working contacts are necessary (probably if did anterior veneers???? just quessing)
      • when group function is desired
30
Q

what technique should you use to deepen a fossae

A

slightly deepen fossa, ensuring that flat plane remains for the opposing cusp to contact (don’t inadvertently create an incline - because remember we want axial loading)

Prosth (2 decks)

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