OCCLUSION

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54 Terms

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occlusion

the anatomical alignment of the teeth and their relationship to the rest of the masticatory system

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malocclusion

any deviation from the ideal occlusal scheme

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overjet

horizontal overlap

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1-3mm

normal overjet

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overbite

vertical overbite

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2-4mm

normal overjet

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open bite

absence of contact between the maxillary & mandibular teeth upon occlusion

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deep bite

severe overlap of the maxillary incisors over the mandibular incisors when the dentition is in occlusion

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crossbite

a discrepancy in the buccolingual relationship of the maxillary & mandibular teeth

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angle’s classification of malocclusion

class I

class II

class III

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class I

neutrocclusion

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class II

distocclusion

retrognathism

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class III

mesiocclusion

prognathism

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Dewey’s modification of class I subtypes

class I type 1

class I type 2

class I type 3

class I type 4

class I type 5

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class I type 1

class I molar relationship with anterior crowding

mesial drifting of the 1st molars

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class I type 2

class I molar relationship with labioversion of the mx central incisors

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class I type 3

class I molar relationship with anterior crossbite

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class I type 4

posterior crossbite

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class I type 5

mesial drifting of 1st molars

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molar relationship of class I MO

mesiobuccal cusp of the mx 1st molar occludes with the mesiobuccal groove of the mn 1st molar

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canine relationship of class I MO

mx canines lies between the mn canine & 1st premolar

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molar relationship of class II MO

the mesiobuccal cusp of the mx 1st molar occludes between the mn 1st molar & 2nd premolar

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canine relationship of class II MO

mx canine is mesial to the mn canine

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molar relationship of class III MO

the mesiobuccal cusp of the mx 1st molar falls between the mn 1st & 2nd molars

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canine relationship of class III MO

the mx canine is distal to the mn canine

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class II subdivisions

class II division 1

class II division 2

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class II division 1

class II molar relationship with mx centrals in extreme labioversion

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class II division 2

class II molar relationship with mx centrals tipped palatally, mx laterals tipped labially or mesially

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Dewey’s modification of class III subtypes

class III type 1

class III type 2

class III type 3

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class III type 1

class III molar relationship with edge-to-edge bite

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class III type 2

class III molar relationship with anterior crowding

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class III type 3

class III molar relationship with anterior crossbite

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alignment

shaping the arch based on the shape of the archwire

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levelling

the incisal & occlusal surfaces of ALL teeth in one arch fall on the same plane

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3 problems during angle’s paradigm

less emphasis was given to facial proportions & esthetics

excellent occlusion was unsatisfactory at the expense of facial proportions

it was impossible to maintain the post-treatment occlusal relationships

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Dr. Charles Tweed & Raymond Begg in 1930s

reintroduced the extraction of teeth in united states and australia

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soft tissue paradigm

states that both the goals & limitations of modern orthodontics & orthognathic treatment are determined by the soft tissues of the face, NOT by the teeth and bones

a combined orthodontic & orthognathic approach is routinely used to produce aesthetically & functionally superior treatment results in patients presenting with significant dentofacial deformities

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primary treatment goal during angle paradigm

ideal dental occlusion

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primary treatment goal during soft tissue paradigm

normal soft tissue proportions & adaptations

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secondary goal during angle paradigm

ideal jaw relationships

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secondary goal during soft tissue paradigm

functional occlusion

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hard & soft tissue relationships during angle paradigm

ideal hard tissue proportions produce ideal soft tissues

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hard & soft tissue relationships during soft tissue paradigm

ideal soft tissue proportions define ideal hard tissues

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diagnostic emphasis during angle paradigm

dental casts / cephalometric radiographs

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diagnostic emphasis during soft tissue paradigm

clinical examination of intraoral & facial soft tissues

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treatment approach during angle paradigm

obtain ideal dental & skeletal relationships, assume the soft tissues will be all right

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treatment approach during soft tissue paradigm

plan ideal soft tissue relationships & then place teeth & jaws as needed to achieve this

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function emphasis during angle paradigm

TMJ in relation to dental occlusion

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function emphasis during soft tissue paradigm

soft tissue movement in relation to display of teeth

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stability during angle paradigm

related primarily to dental occlusion

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stability of result during soft tissue paradigm

related primarily to soft tissue pressure & equilibrium effects

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le fort I

floating palate

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le fort II

floating mx

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le fort III

craniofacial disjunction