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Ortho II > Vertical Problems > Flashcards

Vertical Problems Flashcards

1
Q

what is the normal overbite

A

20% plus or minus 5%

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2
Q

overbite is _______ related to severity of malocclusion

A

not related

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3
Q

what are the etiological factors for an overbite

A
  • over eruption of upper incisors
  • over eruption of lower incisors
  • under eruption of lower posterior teeth
  • genetic development- class II div 2
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4
Q

what is involved in a class II deep bite

A
  • over eruption of maxillary incisors
  • over eruption of mandibular incisors
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5
Q

what are the treatment options of the class II deep bite

A

treatment options should include active intrusion of the incisors

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6
Q

what does the intrusion arch do

A

correct the two step occlusal plane

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7
Q

what happens when leveling the curve of spee

A
  • maxillary incisors have been intruded
  • leveling the lower arch by incisor intrusion
  • extrusion of mandibular posterior teeth
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8
Q

what is a way to avoid relapse of overbite

A

a hawley retainer with an anterior bite plate to maintain the corrected overbite

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9
Q

what do you do with an overbite with mandibular incisor intrustion

A
  • bite opening with posterior blocks
  • intrusion of lower incisors with light wire and constant force
  • upper incisors are left at the same level
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10
Q

what are the treatment options for extrusion of posterior segments combined with maxillary incisor intrusion

A
  • bite plate at night
  • lower intrusion arch
  • cervical pull HG to correct class II molar relation, extrude molars
  • intrusion arch for maxillary incisors, lower molar eruption with a bite plate
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11
Q

what are the origins of an open bite

A
  • genetic origin
  • functional origin
  • parafunctional habits
  • combination
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12
Q

what are the multifactorial etiologies of an open bite

A
  • skeletal (genetic)
  • tongue thrust
  • finger habit
  • sleep apnea
  • neuromuscular
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13
Q

what malocclusions are anterior open bites present in

A

a multitude of malocclusions

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14
Q

etiologies for open bite are:

A

ill defined

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15
Q

is the relapse rate higher for open bites or non open bite malocclusions

A

open bites

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16
Q

what is the facial type, lip support, lip seal, upper incisor showing at rest, smile line, facial proportions in an open bite

A
  • facial type: variable usually dolychocephalic tendency
  • lip support: altered
  • lip seal: deficient
  • upper incisor showing at rest: variable but usually increased
  • smile line: altered
  • facial proportions: variable
17
Q

what is the dentoalveolar response causing an open bite

A
  • displacement of maxillary incisors in the vertical and AP plane
  • intrusion and proclination of mandibular incisors
  • over eruption of maxillary and/or mandibular molars
18
Q

what is assessed in the occlusal plane analysis

A

the position of posterior and anterior teeth in relation to the functional occlusal plane

19
Q

why is the occlusal plane hard to determine

A

the anterior teeth are often times displaced in the vertical plane

20
Q

what is the DDX for open bite

A
  • anterior tongue posture
  • thumb sucking habit
  • genetics
  • sleep apnea
  • combination
21
Q

what are the parafunctional habits affecting open bites

A
  • thumb sucking
  • anterior tongue posture
  • dentoalveolar deformation and lack of tooth eruption
22
Q

what are the tx options for a thumb sucking pt

A
  • fixed appliances
  • tongue crib
  • psychological support
  • myofunctional therapy
23
Q

what is the AOB neuromuscular origin

A
  • anterior tongue posture
  • maxillary incisors pushed labially
  • mandibular incisors under erupted
  • good posterior occlusion
  • good facial balance
24
Q

what is the ismar modified appliance used for

A

open bites

25
Q

what is the dx for class III open bite

A
  • moderate maxillary retrognathia
  • moderate mandibular prognathism
  • dental crowding with blocked out canines
  • severe open bite
26
Q
A

Ortho II (11 decks)

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