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Fixed 2 > Fundamentals of Occlusion for Fixed Prosthodontics > Flashcards

Fundamentals of Occlusion for Fixed Prosthodontics Flashcards

1
Q

__________ is a critical factor for all dental restorations and for the health and longevity of teeth and intraoral structures

A

Occlusion

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2
Q

A patient may have an orthodontically ideal
Angles Class I Occlusion. This does not mean that the patient has…

A

optimal occlusal contacts, optimal condyle/mandibular position, and ideal/optimal contacts in excursive movements

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3
Q

Conversely a patient with a Class II or Class III occlusion, although not orthodontically ideal, may in fact have…

A

an acceptable, functional occlusion

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4
Q

Patients may have a less than ideal occlusion, HOWEVER, it may still be…

A

a functionally acceptable occlusion
or
a physiologically acceptable occlusion

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5
Q

What do you need to access when looking at a patient’s occlusion if it deviates from the ideal?

A
  • is treatment required?
  • adaptive capacity of a patient
  • if treatment is rendered, what is the optimal position for the joints, muscles, and teeth
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6
Q

What is mutually protected occlusion?

the optimal functional occlusion

A
  • Multiple, even, bilateral, simultaneous occlusal contacts of the posterior teeth in MIP with the mandible is CR position i.e. MIP and CR are coincident.
  • The anterior teeth exhibit lighter occlusal contacts as compared to posterior teeth in MIP.
  • Posterior teeth are axially loaded in MIP
  • In excursive movements: canine guidance/anterior guidance occurs
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7
Q

The TM Joints are in an optimum, orthopedically stable joint position when the mandible is in…

A

CENTRIC RELATION

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8
Q

In mutually protected occlusion, the _____________ teeth withstand the majority of the load in MIP, protecting the _________ teeth from high loads

A

posterior
anterior

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9
Q

In mutually protected occlusion, the anterior teeth disclude the posterior teeth in excursive movements, thereby protecting the posterior
teeth from…

A

off-axis loading

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10
Q

Posterior teeth can tolerate axial loading well so they protect anterior teeth, which are not axially loaded, in…

A

MIP

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11
Q

____________ teeth can tolerate lateral forces in excursive movements (off-axial loading) since they are further away from the fulcum and the loads are less.

A

Anterior

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12
Q

When is evaluation of occlusion required in fixed?

A
  • Is required at all phases of the fixed prosthodontic treatment (diagnosis and treatment)
  • Better results if the evaluation of Occlusion has been done at all stages (even for simple prosthodontic treatments)
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13
Q

Maxillary cast is articulated using a…

A

facebow record

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14
Q

2 positions to articulate mandibular casts are…

A
  • Centric Relation (CR)
  • Maximum Intercuspation (MIP)
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15
Q

What is the purpose of the facebow?

A

orient the maxillary cast to the rotational axis in three planes

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16
Q

What is a kinematic facebow?

A
  • This facebow is the most accurate (locates the True Hinge Axis)
  • Requires training, elaborate instruments, and more time
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17
Q

What is an arbitrary facebow?

A
  • Locates an arbitrary hinge axis by using anatomical landmarks
  • Less accurate
  • Requires less complicated instruments and less time
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18
Q

What are the benefits of using a facebow record?

A

Using a facebow will result in the path of opening and closure (arch of closing) being the same on articulator as intraorally

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19
Q

What is centric relation (CR)?

A

The position of the mandible in which the condyles are in the most superior and anterior position in the articular fossae, resting against the posterior slopes of the articular eminences with the articular discs interposed

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20
Q

Recording CR on a dentate pt requires an…

A

anterior deprogrammer

21
Q

Ariculating casts in CR requires…

A
  • Interocclusal Record(s)
  • The record is made at ↑OVD
    — Avoid deflective tooth contacts
22
Q

CR record is made at an ___________ OVD

23
Q

If an accurate CR record is made, then the MIP position can or cannot be achieved on the articulator?

24
Q

What is maximal intercuspal position (MIP)?

A
  • This is a position in which the maxillary and mandibular teeth make maximum surface contact with each other
  • The mandible is elevated as superiorly as possible in the sagittal plane
  • “habitual closing” position
25
# True/false For most patients: MIP and CR are NOT coincident
True
26
For most dentate patients: an interocclusal record(s) should or should not be used to articulate the dx casts in MIP
should not
27
What might be needed to mount a case for a partially edentulous patient?
- Occlusal Records may be needed (Stabilized Record Bases) - Without posterior occlusion / few remaining teeth, casts cannot be related accurately.
28
The casts that are mounted on the articulator need to exhibit the same _________________ as the teeth do intraorally
occlusal relation
29
When to articulate casts using CR record?
* Diagnose occlusal disease * Completely edentulous patients * Partially edentulous patients * Dentate patients to receive extensive fixed prosthodontic restorations
30
What is a full size articulator used for?
Anatomic hinge axis close to that of patient * Slight difference in arc of closure between patient and articulator
31
For a small arch??? or small articulator what is true? | her slides confused me
Large difference in arc of closure between patient and articulator → centric premature contacts in restorations
32
Opposing cusps will travel through ____________ without tooth contact in excursions (posterior teeth disclude during excursive movements)
groove pathways
33
What is the purpose of a custom incisal guide table?
Provides record of the lingual concavity and incisal edge length/position and therefore anterior guidance for replication when fabricating anterior indirect restorations
34
How do you articulate the master cast (working cast)?
* Ensure accurate tooth to tooth occlusal contacts * Verify contact of incisal pin to the anterior guide table * Accuracy of mounting is critical to create accurate occlusion on restorations
35
What does the material of an interocclusal record need to have?
* No resistance to closure * Rigid when set * Dimensional stability / accuracy
36
When do you make an MIP interocclusal record?
* For patients that have a stable MIP position * Mount casts with MIP record at OVD
37
An interocclusal record made in MIP should only be between what teeth?
preppared teeth - if between unpreppared teeth then it will not be in MIP anymore
38
What are the concepts of occlusal schemes?
* Mutually Protected Occlusion * Group Function (Unilaterally Balanced Occlusion) * Balanced Occlusion (Bilateral Balanced Occlusion)
39
What is optimal occlusion (mutually protected occlusion)?
* Multiple, even, bilateral, simultaneous occlusal contacts of the posterior teeth in MIP with the mandible is CR position i.e. MIP and CR are coincident. * The anterior teeth exhibit lighter occlusal contacts as compared to posterior teeth in MIP * Posterior teeth are axially loaded in MIP * In excursive movements there is canine guidance and anterior guidance
40
What is group function?
(Unilaterally Balanced Occlusion) * as mandible moves laterally, it is guided by a group of teeth (canine, premolars, and MB cusp of 1st molar) on the working side
41
What is balanced occlusion?
(Bilateral Balanced Occlusion) * Simultaneous contacts on both sides during lateral movements (W and NW sides) and between posterior/anterior during protrusive * Not acceptable for dentate patients --- Promotes tooth wear; NW side contacts are destructive * Acceptable form of occlusion for CD and RPD --- Contact on NW side can help stabilization of the removable prosthesis
42
Cusps and ridges should allow ______ occlusal contact(s) with opposing teeth with forces along long axes
even
43
Non-centric cusps should overlap both...
horizontally and vertically
44
Opposing cusps should travel through groove pathways without posterior teeth contacts in excursive movements in order for...
* Posterior teeth disocclusion * Avoid interferences
45
What is a cusp-fossa relationship?
46
What are the types of cusp-marginal ridge relationships?
47
What is the curve of spee (A-P curve)?
* Cusps follow an anteroposterior curve * Steepness of curve influences the cusp heights
48
What is the curve of Wilson (M-L curve)?
* Mediolateral curve * Non-functional cusps shorter than functional cusps * Helps prevent interferences in lateral excursions
49
What should the occlusal surface look like in terms of contacts?
1. Tripodized point contacts on cusps, fossae / marginal ridges. 2. Buccal and lingual cusps lie along a-p lines.

Fixed 2 (11 decks)

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