Vertical Problems Flashcards
overbite
amount of overlap of the lower incisors by the central incisors
overbite
measured in percentage: normal is
20% +/-5
amount of overbite is not directly related to
severity of malocclusion
overbite
etiological factors (4)
over eruption of upper incisors
over eruption of lower incisors
under eruption of lower posterior teeth
genetics development (C1 II Div 2)
growth considerations (3)
do deep bites improve with growth?
do they remain constant?
do they improve?
class 2 deep bite (2)
over eruption of max incisors
over eruption of mand incisors
intrusion arch
correct the two step occlusal plane
leveling the curve of spee (3)
max incisors have been intruded
leveling the lower arch by incisors intrusion
extrusion of mand posterior teeth
achieved tx goals
(2)
overbite went from 100% + to 30% and back to 40% after some relapse
one way to avoid relapse is to provide a Hawley retainer with an anterior bite plate to maintain the corrected overbite
disocclusion, intrusion, IPR (3)
bite opening with posterior blocks intrusion of lower incisors with light wire and constant force
upper incisors are left at the same level
skipped
extrusion of posterior segements
combined to max incisor intrusion
tx options (2)
bite plate at night
lower intrusion arch
therapeutics
—- hg to correct class 2 molar relation, extrude molars
— for max incisors, lower molar eruption with a —-
cervical pull
intrusion arch
bite plate
2 years post tx (5)
corrected class 2
reduced overbite
torqued incisors
leveled curve of spee
coordinated arches
open bite (4)
genetic origin
fxn origin
parafunctional habits
combination
open bite multifactorial etiologies
(5)
skeletal (genetic)
tongue thrust
finger habit
sleep apnea
neuromuscular
anterior open bites are present in a multitude of —
etiologies are —
no prospective studies, mainly case studies and opinons
— rate is reported as significant and higher than non open bite malocclusions
malocclusions
ill defined
relapse
facial characteristics
(6)
facial type
lip support
lip seal
upper incisor showing at rest
smile line
facial proportions
facial type (2)
lip support:
lip seal:
upper incisor showing at rest:
smile line:
facial proportions:
variable
usually dolychocephalic tendency
altered
deficient
variable but usually increased
altered
variable
dentoalevolar response causing an open bite (3)
displacement of max incisors in the vertical and AP plane
intrusion and proclination of mand incisors
over eruption of max and/or mand molars
occlusal plane analysis (2)
assess the position of posterior and anterior teeth in relation to the functional occlusal plane
hard to determine as the anterior teeth are often times displaced in the vertical plane
diff dx (5)
anterior tongue posture
thumb sucking habit
genetics
sleep apnea
combo
parafunctional habits (3)
thumb sucking habit
anterior tongue position
-dentoalveolar deformation and lack of tooth eruption
thumb sucking pt tx (4)
fixed appliances
tongue crib
psychological support
myofunctional therapy
AOB neuromuscular origin (5)
anterior tongue postition
max incisors pushed labially
mand incisors under erupted
good post occlusion
good facial bone
dx (4)
moderate max retrognathia
moderate mand prognathism
dental crowding with blocked out canines
severe open bite
— malocclusions are difficult to correct and may prove to be unpredictable in their management and outcome
vertical
— must be considered as no improvement or worsening of the condition may be expected
growth
