Diagnosis And Causes Of Class II Division 1 Malocclusion
(1) Write the different skeletal combination of class 2, div. 1 malocclusion and write down facial and dental features of the same.
(2) Briefly mention the probable etiological factors for development of class II, div. 1 malocclusion.
Answer.
(1) Skeletal changes in class II, div. 1 malocclusion. The upper arch is narrower at the premolar and canine region thereby producing ‘V’ shaped upper arch.
- Maxilla is prognathic
- Mandible is retrognathic.
- Combination of prognathic maxilla and retrognathic mandible.
- Cases associated with receding chin.
Facial Features
- Profile is convex.
- Presence of posterior divergence.
- Presence of incompetent or potentially incompetent lips.
- Presence of short hypotonic upper lip.
- Increase in overjet causes lip trap.
- Lower lip is hyperactive.
- Presence of abnormal buccinator activity due to the posterior placement of the tongue.
Dental Features
- Presence of Class 2 molar relation.
- Presence of Class 2 incisor relation due to increase in overjet.
- Overbite is deep.
- If thumb sucking is involved there is incomplete overbite.
- Presence of deep curve of Speed.
- Presence of Class 2 canine relationship.
- Crossbite and scissor bites are occasionally present.
(2) Causes of Class 2 Div. 1 malocclusion
- Prenatal factors
- Natal factors
- Postnatal factors
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