class II div 2 malocclusions

Question 1

definition of class II div 2 malocclusion

Answer 1

lower incisor edge occludes posterior to the cingulum plateau of the upper incisor. Upper incisors are retroclined
The overjet is reduced but can also be increased

Question 2

typically is the FMPA in class II div 2 patients reduced, increased or average

Answer 2

typically reduced FMPA

Question 3

describe the vertical skeletal tendencies of a class II div 2 patient

Answer 3

FMPA typically reduced
associated with forward growth pattern of the mandible
prominent chin

Question 4

describe the soft tissue tendencies of class II div 2 patients

Answer 4

higher resting lower lip line - secondary to decreased lower face height and retroclined upper incisors
marked labio mental fold

Question 5

IIA

Answer 5

interincisal angle
external angle subtended by the long axis of the maxillary and mandibular central incisors

Question 6

what is more common in class II div 2 patients

Answer 6

dental anomalies e.g hypodontia or supernumeraries

Question 7

discuss the common dental features of class II div 2 patients

Answer 7

lower incisors may occlude with upper incisors or palate (traumatic overbite)
congenital dental anomalies are more common
deep overbite
OJ usually reduced
increased IIA
class II buccal segments

Question 8

why would we treat class II div 2 patients

Answer 8

aesthetic concerns
dental health concerns - traumatic overbite, IOTN 4f

Question 9

when would we accept a class II div 2 malocclusion

Answer 9

patient not concerned
overbite not a problem
acceptable aesthetics

Question 10

how would growth modification be utilised in a class II div 2 patient

Answer 10

use of a modified twin block to procline upper incisors

Question 11

name an example of an active component that may be used on a URA to procline incisors in a class 2 div II patient

Answer 11

ELSA spring

Question 12

what needs to be done to camouflage a class 2 div II malocclusion stably

Answer 12

reduce overbite and correct (reduce) the IIA

Question 13

how is the IIA corrected in class 2 div II patients

Answer 13

palatal root torque of upper incisors and proclination of lower incisors