Occlusion Flashcards

1
Q

Ideal oclusion definitions

A
  • Mesiobuccal ridge of maxillary 1st molar fits into the mesiobuccal groove of mandibular 1st molar
  • Cusp of maxillary canine is in the embrasure between the mandibular canine and mandibular 1st premolar
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2
Q

Ideal occlusion ideal relationships

A
  • Ideally, buccal cusps of maxillary teeth are positioned more buccally than the buccal cusps of mandibular teeth
  • Ideally, each maxillary tooth is positioned slightly distal (vertical long axis) to the corresponding mandibular tooth of the same type
  • Ideally, lingual cusps of maxillary posterior teeth rest in occlusal fossae of the mandibular teeth. Buccal cusps of mandibular teeth rest in occlusal fossae of maxillary teeth
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3
Q

Class 1, 2, and 3 malocclusion profile

A
1= orthognathic (72%)
2= retrograde (22%)
3= prognathic (6%)
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4
Q

Labioversion

A

single tooth, a tooth out of alignment to the labial or buccal compared to other teeth in the arch

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5
Q

linguoversion

A

single tooth, a tooth out of alignment to the lingual compared to other teeth in the arch

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6
Q

toriversion

A

single tooth, a tooth that is twisted around its tooth axis

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7
Q

Supraversion, supraeruption or extrusion

A

single tooth, tooth that is overerupted that is abnormally long relative to the rest of the occlusal surfaced

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8
Q

Infraversion or infraocclusion

A

single tooth, is abnormally short relative to the rest of the occlusal plane

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9
Q

Ankylosis

A

is fusion of cementum to alveolar bone when periodontal ligament is lost, can cause infraversion

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10
Q

posterior teeth crossbite

A

i. Mandibular molars too buccal or maxillary molars too lingual
ii. Maxillary molars too buccal or mandibular molars too lingual

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11
Q

anterior teeth crossbite

A

mandibular incisors are more labial than maxillary incisors

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12
Q

overbite

A

**normal overbite= only the incisal third of mand incisor
overlapped vertically
**deep overbite= maxillary incisors completely overlap mandibular incisor crowns (vertical)

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13
Q

Edge-to-edge

A

incisal edges of both maxillary and mandibular arches occlude

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14
Q

open bite

A

incisor edges of opposing arches do NOT occlude, nor is there vertical overlap when the posterior teeth are closed together

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15
Q

over-jet

A

maxillary incisors are excessively labial/anterior compared to mandibular incisors (horizontal)

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16
Q

class 2 division 1

A

exhibit considerable overjet (often with ALL maxillary incisors tipped labially)

17
Q

class 2 division 2

A

incisors exhibit deep overbite often with maxillary central incisors tipped lingually BUT lateral tipped labially

18
Q

class 3

A
  • The anterior relationship is often edge to edge OR crossbite
  • jaw jutted anterior
  • true class 3 if difference in alignment is width of premolar
19
Q

class 2 vs class 3 mandible placement

A
  • *class 2= retrograde profile-Profile has mandibular arch jutted backwards, so mandibular 1st molar and canine are distal of ideal occlusion
  • *class 3= prognathic profile- Profile has mandibular arch jutting anterior, so mandibular 1st molar and canine are mesial/anterior of ideal occlusion
20
Q

Crepitation

A

crackly or grating sound within jaw joint during function when severe overjet present

21
Q

Temporomandibular joint (TMJ)

A

articulation between the mandible and two temporal bones at the base of the skull; only free moving joint in skull; bilateral articulation; all 3 parts enclosed by fibrous connective tissue

22
Q

Bruxism

A

grinding teeth at night

23
Q

degultition means?

A

swallowing

24
Q

functional verses parafunctional tooth contacts

A
  • Functional tooth contacts occur during the normal day to day process of mastication
  • Parafunctional tooth contacts occur for clenching or bruxing teeth (or something in your mouth you don’t eat like your own check/tooth or a clarinet reed or pipe or chewing a pencil)
25
Q

Fremitus

A

palpable or visible movement or vibration of the tooth when subjected to heavy occlusal forces; caused by heavy occlusion

26
Q

Trismus

A

disturbance of the fibers of the nerve to the chewing muscles; can be a negative side-affect to parafunctional contacts