DEFINITION-Angles class II malocclusion is characterized by class II molar relation where the distobuccal cusp of upper first molar falls in the buccal groove of mandibular first molar.
CLASSIFICATION- Class II Div 1 & Class II Div 2
Angles class II malocclusion can be dental or it can be of skeletal origin.
Skeletal Features can include a prognathic maxilla or a retruded (hypoplastic) mandible or both.
CLASS II DIV 1 MALOCCLUSION-
In class II div1 lower facial height can be found to get increased or it can be normal.
If its increased than there would be reduced overbite or mild open bite and if its normal than there would be pseudo deep bite.
Pseudo Deep bite-Due to proclined upper anterior,the lower anterior fail to make contact with the palatal surface of upper anterior.thus they are free to erupt leading to an increased overbite and excessive curve of spee.
CLASS II DIV2 MALOCCLUSION-
Thus Class II div 1 can either show excess vertical growth or normal growth whereas Class II div 2 are always cases of horizontal growth.
HOW TO CHECK THAT WHETHER CLASS II MALOCCLUSION IS BECAUSE OF MAXILLARY PROGNATHISM OR MANDIBULAR RETROGNATHISM?
Visual treatment Objective-In this patient is asked to bring his mandible forward,if the patient's profile improve by this movement than the malocclusion is due to retrognathic mandible.and patient is an ideal candidate for myofunctional appliance therapy.(if he is meeting other requirements as well)
CLASSIFICATION- Class II Div 1 & Class II Div 2
Angles class II malocclusion can be dental or it can be of skeletal origin.
Skeletal Features can include a prognathic maxilla or a retruded (hypoplastic) mandible or both.
CLASS II DIV 1 MALOCCLUSION-
- Its a condition exhibiting class II molar relationship along with proclined maxillary incisors.
- Increased over jet(due to protruded upper incisors)
- Convex profile(due to protruded upper incisors)
- Short hypo tonic upper lip(due to protruded upper incisors)
- Patient may place lower lip against palatal surface of upper incisors leading to lip trap
- Abnormal muscle activity and lower tongue possition (abnormal buccinator and mentalis activity leading to constricted maxillae)
- Posterior Cross bite(due to constricted maxilla)
- Patient shows a normal path of closure for mandible
In class II div1 lower facial height can be found to get increased or it can be normal.
If its increased than there would be reduced overbite or mild open bite and if its normal than there would be pseudo deep bite.
Pseudo Deep bite-Due to proclined upper anterior,the lower anterior fail to make contact with the palatal surface of upper anterior.thus they are free to erupt leading to an increased overbite and excessive curve of spee.
CLASS II DIV2 MALOCCLUSION-
- The Class II div 2 malocclusion is a condition characterized by a class II molar relation with retroclined upper centrals that are overlapped by lateral incisors.
- Here the muscle activity seems to be normal and so is the maxillary arch
- Backward path of closure of mandible is seen (due to palatally tipped upper CI)
- Straight profile face
Thus Class II div 1 can either show excess vertical growth or normal growth whereas Class II div 2 are always cases of horizontal growth.
HOW TO CHECK THAT WHETHER CLASS II MALOCCLUSION IS BECAUSE OF MAXILLARY PROGNATHISM OR MANDIBULAR RETROGNATHISM?
Visual treatment Objective-In this patient is asked to bring his mandible forward,if the patient's profile improve by this movement than the malocclusion is due to retrognathic mandible.and patient is an ideal candidate for myofunctional appliance therapy.(if he is meeting other requirements as well)
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