Class 2 Division 2 Malocclusion Flashcards
what is the BSI definition of class 2 div 2
lower incisor occludes posterior to the cingulum plateau of the upper incisor. the upper incisors are retroclined and the overjet can be reduced or increased
what is the usual skeletal pattern for class 2 div 2
mild/moderate AP 2
reduced FMPA with forward rotational pattern of mandible growth
prominent chin
what are the soft tissues like in class 2 div 2
high resting lower lip line
marked labio-mental fold
high masseteric forces
upper 2s have shorter clinical crown
what are the dental features of class 2 div 2
lower incisors may occlude with upper incisors or palatal mucosa
retroclination of upper centrals
upper 2s crowded
reduced arch length
lateral incisors have poor cingulum
deep overbite
reduced overjet
class 2 buccal segements
increased incisal angle
what does treatment depend on
severity of malocclusion
age and motivation
dental health
patient concerns
when do you accept a class 2 div 2
acceptable aesthetics
patient not concerned
overbite not problem
when is growth modification used
growing patient
mild to moderate skeletal 2 pattern
what is the aim of functional appliances
procline upper incisors
what type of functional appliances can be sued
modified twin block
springs or screw
upper sectional fixed appliance
what do fixed appliances aim to fix
overbite reduction and correction of interincisal angle
how do you correct the inter-incisal angle
palatal root torque of upper incisors and proclination of lower incisors
what are the problems with stability and retention with this malocclusion
rotated laterals and deep overbite can relapse
long term bonded retention required
facial growth affects stability
how do you fix the deep overbite
growth modification with functional appliance
URA with FABP
