12: Increased overbite

12 Increased overbite

Examination

Intraoral

image What are the possible causes of the traumatic overbite?

In a Class II division 2 malocclusion several factors contribute to an increased overbite. These are listed in Table 12.1.

Table 12.1 Causes of increased and traumatic overbite in Class II division 2 malocclusion

Cause Aetiology
Skeletal: anteroposterior and vertical A Class II skeletal pattern in combination with a reduced lower facial height
Growth pattern An anterior mandibular growth rotation tends to increase overbite
Soft tissues Effects are via the skeletal pattern – reduced lower facial height leads to a high lower lip line that will retrocline the upper incisors, leading to overbite increase
A hyperactive high lower lip in association with a reduced lower facial height leads to bimaxillary retroclination
Dental factors Absence of a well-defined cingulum stop on the upper incisors leads to continued eruption of the lower incisors, increasing overbite

Jan 2, 2015 | Posted by in Orthodontics | Comments Off on 12: Increased overbite
Premium Wordpress Themes by UFO Themes