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dh theory > Occlusion > Flashcards

Occlusion Flashcards

1
Q

What is occlusion?

A

The contact relationship between maxillary and mandibular teeth when the jaws are fully closed, as well as the relationship between teeth in the same arch.

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2
Q

What is centric occlusion?

A

The relation of opposing occlusal surfaces.

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3
Q

What is centric relation?

A

The position of the mandible to the maxilla when the condyles are in their most posterosuperior unstrained positions in the fossae.

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4
Q

What is overjet?

A

The horizontal overlap of the maxillary teeth over the mandibular teeth.

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5
Q

What is overbite?

A

The vertical overlap of the maxillary teeth over the mandibular teeth.

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6
Q

What can occlusal disharmony lead to?

A

Pain, occlusal trauma, and worsened periodontal disease.

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7
Q

What is malocclusion?

A

A deviation in the maxillary and mandibular teeth relationships in centric occlusion.

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8
Q

How many types of malocclusion are there?

A

Three types: Class I, Class II, and Class III.

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9
Q

What does Angle’s Classification of Occlusion focus on?

A

The relationship of the maxillary mesial buccal cusp of the 1st molar to the mandibular molar mesial buccal groove.

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10
Q

What is used when molars are unavailable in Angle’s Classification?

A

The canine relationship or using incisors.

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11
Q

What is the relationship of the maxillary 1st molar in ideal occlusion?

A

The maxillary 1st molar MB cusp is in the mandibular 1st molar MB groove.

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12
Q

Where does the maxillary canine cusp rest in ideal occlusion?

A

Just distal to the mandibular canine.

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13
Q

How are the incisors positioned in ideal occlusion?

A

Normal

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14
Q

What is malocclusion?

A

Malrelationships between individual teeth or groups of teeth.

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15
Q

What may malocclusion include?

A

Crowding within the dental arch
Overbite
Open bite
End-to-end bite
Crossbite

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16
Q

What is the relationship of the maxillary 1st molar in Class I malocclusion?

A

Max 1st molar MB cusp is in the mandibular 1st molar MB groove.

17
Q

Is Class I malocclusion the same as ideal occlusion?

A

Yes, but there is Crowding

18
Q

What is a characteristic of maxillary central incisors in Class II Division 1 malocclusion?

A

The maxillary central incisors protrude.

19
Q

What is the relationship of the maxillary 1st molar in Class II Division 1 malocclusion?

A

The max 1st molar MB cusp is mesial to the mandibular 1st molar MB groove.

20
Q

Where does the maxillary canine cusp rest in Class II Division 1 malocclusion?

A

It rests anterior to the mandibular canine, between the canine and lateral incisor.

21
Q

What are the characteristics of the incisors in Class II Division 1 malocclusion?

A

Severe overjet and deep overbite.

22
Q

What is the characteristic of the maxillary central incisors in Class II Division 2 malocclusion?

A

The maxillary central incisors retrude.

23
Q

What is the relationship of the maxillary 1st molar in Class II Division 2 malocclusion?

A

The max 1st molar MB cusp is mesial to the mandibular 1st molar MB groove.

24
Q

Where does the maxillary canine cusp rest in Class II Division 2 malocclusion?

A

It rests anterior to the mandibular canine.

25
Q

What are the characteristics of the incisors in Class II Division 2 occlusion?

A

Deep overbite with no overjet.

26
Q

What is the relationship of the maxillary 1st molar in Class III malocclusion?

A

The max 1st molar MB cusp is distal to the mandibular 1st molar MB groove.

27
Q

Where does the maxillary canine cusp rest in Class III occlusion?

A

It rests significantly distal to the mandibular canine, with the cusp on the premolar.

28
Q

What is the relationship of the incisors in Class III occlusion?

A

End-to-end.

29
Q

What causes overjet?

A

Class II Division 1 occlusion.

30
Q

What is the normal relationship for overbite?

A

2.5mm.

31
Q

What causes overbite?

A

Class II Division 2 occlusion.

32
Q

What is a crossbite?

A

A condition where the cusps of a tooth in one arch exceed the cusps of a tooth in the opposing arch, either buccally or lingually (reversed relationship).

33
Q

What causes crossbite?

A

Eruption sequence and crowding.

34
Q

What is a common tooth feature in crossbite?

A

A rotated tooth.

35
Q

Common Parafunctional Habits

A

Clenching
Bruxism
Thumb or finger sucking
Rocking of teeth

36
Q

What is primary trauma from occlusion?

A

Injury from excessive occlusal forces on a periodontium that hasn’t been affected by disease.

37
Q

What is secondary trauma from occlusion?

A

Injury from normal or excessive occlusal forces on a weakened periodontium.

38
Q

What causes the periodontium to weaken in secondary trauma?

A

Periodontal disease with apical migration of the junctional epithelium and loss of connective tissue.

dh theory (9 decks)

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