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Removable Spring > 6. Jaw records > Flashcards

6. Jaw records Flashcards

1
Q

What are the 3 components of jaw records

A
  • facebow
  • vertical (VDO)
  • Horizontal (MIP or CR)
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2
Q

During RPD treatment how often must jaw records be obtained

A

3 times

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3
Q

What are the steps where you need to take new jaw records

A
  • Dx casts for tx planing
  • Master casts for framework fabrications
  • Master casts for setting teeth
  • Remount after RPD acrylic processing
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4
Q

Appointment sequence for jaw records

A
  • Verify midline
  • Incisor edge position (BL positioning of teeth)
  • Facebow
  • Determine VDO
  • Decide MIP or CR
  • Occlusal registration
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5
Q

When should you hand-articulate

A

if posterior contacts are present and stable- most accurate ( more than bite reg)

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6
Q

What are the different occlusal schemes

A
  • Balanced
  • Anterior guidance
  • Group funciton
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7
Q

How do you determine what occlusal scheme to follow

A
  • Kennedy class
  • Opposing arch (partial edentulous, dentate or completely edentulous)

Rule 1= The occlusal pattern of remaining natural teeth in mouth dictates occlusion in RPD when no pathology present

Rule 2= The most compromised (weaker arch) dictates the occlusal scheme)

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8
Q

How do you know whether to mount in MIP or CR

A
  • MIP when stable posterior contacts are present (this is a tooth dependent position).
  • CR is stable and reproducible- good for when missing posterior contacts
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9
Q

The occlusal pattern of the remaining natural teeth should be followed except when

A
  • Pathology (TMD issues)
  • Contacts aren’t stable and/or reproducible
  • Not esthetically or functionally acceptable for pt
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10
Q

Signs of occlusal problems are

A
  • Severe tipping
  • Premature contacts
  • Significant slide from 1st contact to MIP
  • Occlusal trauma (mobility/thick PDL)
  • Neuromuscular disturbances/ TMD signs
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11
Q

Opening the VDO does what to the patients arc of closure

A

smaller

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12
Q

Changing the VDO can be done how

A

complete denture

-Fixed prosth

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13
Q

Mainintaing existing VDO can be done how

A
  • Occlusal adjustment of existing teeth (enameloplasty)
  • Harmonize occlusion with direct restorations
  • Extract problem posterior teeth
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14
Q

Change in VDO with fixed requires what steps

A
  • Diagnositic occlusal splint- observe for TMD symptoms
  • Dx wax up in increased VDO
  • Provisional crowns for time in new VDO (if they break then new VDO may not be well tolerated)
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15
Q

VDO in a person with no posterior contacts is determined by

A

dentist (height of wax rims)

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16
Q

When the completely edentulous arch is the weakest what is the occlusal scheme

A

balanced (working and balancing contacts)

17
Q

Why is balanced occlusal scheme useful in completely edentulous arches

A

-avoids unbalanced occlusal stresses and trauma

18
Q

When kennedy class I is the weakest arch which occlusal scheme is suggested

A

balancing (working and non-working contacts)

19
Q

What is the occlusal scheme for a kennedy class I or 2 with a dentate arch

A

working contacts only

20
Q

Occlusal scheme for Kennedy class IV denture

A

no anterior guidance by denture teeth (dislodges denture)

21
Q

Jaw records for the fabrication of the framework need to be done when and dont need to be done when

A

Need to be done when
-RPD + Dentate arch

Don’t need to be done when
-RPD + Completely edentulous arch

22
Q

Why do you not need to do jaw records before the framework when you have a completely edentulous opposing arch

A

-Can adjust the heights of all the teeth (will not interfere with framework)

23
Q

Jaw records before the framework fabrication is helpful to the lab because it

A
  • Determines the thickness and outline of rests
  • Placement of minor connectors
  • Thickness and placement of retention lattice
24
Q

Jaw records before the framework fabrication is helpful to the dentist because it

A

Less adjustments chairside (less intereferences)

25
Q

How do you do new jaw records after framework fabrication

A
  • Place traid over the latticework with wax rims

- New bite reg (only need wax rims if you can’t hand articulate

26
Q

For the jaw records after framework fabrication make sure the RPD record base doesn’t

A
  • Contact opposing natural teeth or tissue
  • Interfere with VDO
  • Has space for bite reg material
27
Q

Different bite reg materials include

A
  • Wax (baseplate or aluwax)
  • Thermoplastic compound
  • PVS (regisil and virtual)
  • Polyether (ramitec)
28
Q

How to remove the PMMA record base after the case has been mounted after framework fab.

A
  • Remove wax rims
  • Heat to soften acrylic record base
  • Remove with hemostat
29
Q

How are posterior denture teeth selected size wise

A

measure distal of canine to incline of ramus

Removable Spring (8 decks)

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