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Treatment Planning > Occlusion stuff - we have to know > Flashcards

Occlusion stuff - we have to know Flashcards

1
Q

masticatory system is complex system compromised of?

A

muscles, bones, ligaments, teeth, and nerves

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2
Q

elevator muscles

A
  1. masseter
  2. medial pterygoid
  3. temporalis
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3
Q

contact made in how many places?

A

THREE -
2 TMJ’s
and the dentition

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4
Q

articular disc

A

dense fibrous connective tissue

NO nerves or blood vessels so it can endure heavy forces

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5
Q

retrodiscal tissues

A

articular disc separates, protects, and stabilizes the condyle in the mandibular fossa during functional movements

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6
Q

specific fibers in the lateral pterygoid?

A

UPPER HEAD OF THE LATERAL PTERYGOID – fibers from this area pull the disk down and forward

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7
Q

TMJ problems representative of the disc?

A

NOO - not disc itself – maybe position of them but the disc has no nerves or blood vessels

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8
Q

implication of imflammation in retrodiscal

A

we do not have a reproducible bite

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9
Q

major stabalizing muscles in the head

A
  1. massater
  2. medial pterygoid
  3. temporalis
  4. superior head of the lateral pterygoid
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10
Q

peripheral disc attachment

A

attached to fibrous capsule an the superior head of the lateral pterygoid (more anteriorly)

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11
Q

disc is attached to condyle how? - specific

A

TIGHTLY – in health — held tightly to the head of the condyle by the medial and lateral collateral (discal ligaments)

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12
Q

describe the medial and lateral collateral (discal) ligaments

include function too

A

composed of collagenous connective tissue

function to restrict the disc from moving away from the condyle and permit the disc to move anteriorly and posteriorly together with the condyle – AS A UNIT during translation

also function during the rotation of the TMJ

*translation and rotation functionoing

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13
Q

positional stability of TMJ determined by - basic

A

determined by muscles pulling across the joint to prevent dislocation

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14
Q

lateral pterygoid controls?

A

PROTRUSIVE movement

SIDE TO SIDE movement

OPENS the mouth

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15
Q

medial pterygoid is a

A

elevator muscle

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16
Q

describe physiologic location of CR

A

where the condyle goes when the lateral pterygoid releases and the elevator muscles contract

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17
Q

CR?

A

the most muscoskeletal stable position of the TMJ

MOST SUPERIOR-ANTERIOR position of the condyles

  • against the posterior slopes of the articular eminences
  • articular discs properly interposed
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18
Q

Centric slide aka

A

MIP

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19
Q

describe centric slide

A

when closing in centric relation results in cusp tip to cusp tip occlusal position – but then CENTRIC SLIDE – CUSP TIP TO FOSSA RELATIONSHIP WAS ATTAINED

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20
Q

what holds the jaw forward

A

lateral pterygoid contraction

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21
Q

stable occlusion allows for

A

both effective functioning AND minimal damage to all components

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22
Q

to be in harmony?

A

all must be stable

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23
Q

optimal functional tooth contacts?

A

optimum occlusal conditions, then require EVEN AND SIMULTAENOUS CONTACT of ALL possible TEETH
- this maximizes the stability of the mandible and MINIMIZES THE amount of force on each tooth

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24
Q

result of harmony and balance loss

A

two posterior contacts – force is loaded on that side causing the muscle on the OPPOSITE SIDE PULL CONDYLE on the unopposed side FURTHER into the mandibular fossa

this causes unilateral shift and possible damage to one or both sides of the TMJ

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25
Q

minimal # of posteiror stops?

A

4 – for stability (shorten dental arch)

26
Q

sphere of Monson?

A

CS + CW

27
Q

curve of spee

A

teeth aligned parallel to the arc of closure

protrusive disocclusion of posteiror teeth

28
Q

curve that protects in protrusive

A

curve of spee – protrusive disocclusion of posterior teeth

29
Q

curve of wilson facilitates

A

tongue and cheek action for POSITIONING FOOD ON THE OCCLUSAL TABLE

permits lateral mandibular EXCURSION FREE FROM POSTERIOR INTERFERENCES

30
Q

lateral pterygoid more active

A

jaw looks more forward

31
Q

cusp tip hits

A

we slide and move

32
Q

VDO

A

vertical dimension of occlusion

- superior-inferior RELATIONSHIP of the maxilla and the mandible when the teeth are situated in maxium intercuspation

33
Q

VDO described as

A

appropriate, excessive, or deficient

34
Q

VDO measured by

A

subjective signs related to esthetics and phonetics

35
Q

occlusal plan definition **

A

imaginary surface that theoretically touches the incisal edge f the incisors and the tips of the occluding surfaces of the posterior teeth

36
Q

does VDO have anythig to do with stability?

A

NO – it is a RELATIONSHOP

37
Q

before restore must do what?

A

re-establish stability

38
Q

three criteria for optimum functinal occlusion

A
  1. even and simultaneous contact of all possible teeth
  2. condyles in their most superior anterior position against the posterior slopes of the eminence
  3. articular discs properly interposed
39
Q

pressure and tension? good bad?

A

pressure = bad

tension = good

40
Q

role of the PDL

A

the PDL helps control these forces and provide stimulation

PDL convers a destructive force (pressure) into an acceptable force (tension)

41
Q

vertical stops are

A

support for occlusion

42
Q

describe tip or fossa contact

A

force is directed vertically through the long axis

force is well accepted due to the alignment of the PDL fibers

AXIAL LOADING – what we want

43
Q

describe contacts on inclines

A

a horizontal component causes TIPPING

some areas of the PDL are compressed while others are elongated

forces are not effectively dissipated to the bone

OFF AXIS LOADING

44
Q

axial loading

A

forces of closure are directed through the long axis of the tooth

45
Q

unsupported anterior tooth contacts due to

A

forces applied at an angle to the long axis have potential to cause harm

46
Q

teeth that accept horizontal forces of occlusion and why

A

CUSPIDS

  • long thick roots
  • better crown/ root ratio
  • surrounded by dense bone
  • extensive periodontal ligament
  • most proprioceptive sensitive tooth in the mouth
47
Q

most proprioceptive sensitive tooth

A

cuspids

48
Q

four points of contact aka

A

group function

49
Q

when restoring best alternate occlsal scheme is?

A

group function / four points of contact

50
Q

describe group function

A

no contact on non-working side during excursions

no posteiror contact during protrusive movements

51
Q

optimal group function

A

canine lus premolars and the MB cusp of the first molar

52
Q

contqacts posterior to MB cusp of first molar

A

more posterior than the MB cusp of first molar not desirable necause of increased force that can be generated closer to the fulcrum (TMJ) and force vectors (muscles)

53
Q

anything less than __ is not group function

A

four points of contact

54
Q

anterior group function

A

canines and incisors (usually just lateral incisors ) function together to disocclude the posterior teeth during lateral and lateral protrusive excursions of the mandible

55
Q

anterior teeth function in ? in terms of forces

A

anterior guidance directs ECCENTRIC forces
- heavier anterior forces

they are NOT positioned to accept heavy forces

their LABIAL angle makes it impossible to achieve axial loading

56
Q

mutually protected occlusion

A

posterior teeth should contact more heavily than anterior teeth in centric occlusion

57
Q

three types of interferences

A
  1. tinterferences furing the desired occlusal scheme (group function or canine guidanece) – like mediotrusive/ working and non-working side interferences
  2. prematurity (usually high restoration)
  3. Deflective occlusal contact (centric interference - usually natural)
58
Q

contacts on inclines aka

A

eccentric forces

59
Q

when forces are NOT effectively dissipiated to the bone, pathologic processes that may occur?

A

neuromuscular reflex activity

  1. AVOIDANCE
  2. PROTECTION
60
Q

location of occlusal plane*

A

PARALLEL TO ALA TRAGUS LINE

Treatment Planning (9 decks)

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