5. class2 division1

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  • 1. Class2 division1
    • This classification according to british standards institute classification:-
    • This class based upon incisor relationship and is the most widely used descriptive classification .
    • Classified as:-
    • Class1-the lower incisor edges occlude with or lie immediately below the cingulum plateau of the upper central incisors.
  • 2.
    • Class2-the lower incisor edges lie posterior to the cingulum plateau of the upper incisors. There are two subdivisions of this category:
    • Division1-the upper central incisors are proclined or of average inclination and there is an increase in overjet.
    • Division2-the upper central incisors are retroclined. The overjet is usually minimal or may be increased.
    • Class3-the lower incisor edges lie anterior to the cingulum plateau of the upper incisors. The overjet is reduced or reversed.
  • 3. Class2 division1
    • Definition
    • Aetiology
    • Occlusion Feature
    • Out line of management
  • 4.
    • Definition :-
    • The British Standards classification defines a Class2 division1 incisor relationship as follows: the lower incisor edges lie posterior to the cingulum plateau of the upper incisors, there is an increase in overjet and the upper central incisors are usually proclined.
    • In a Caucasian population the incidence of Class2 division1 incisor relationship is approximately 15-20 per cent.
  • 5.
    • Prominent upper incisors, particularly when the lips are incompetent, are at increased risk of being traumatized. It has been shown that children with an overjet greater than 9 mm are twice as likely to have suffered trauma involving their upper incisor teeth as are those with normal or reduced overjets.
  • 6.  
  • 7.
    • AETIOLOGY :-
    • 1-Skeletal pattern.
    • 2-Soft tissues.
    • 3-Dental factors.
    • 4-Habits.
  • 8. Occlusal features
    • The overjet is increased.
    • The upper incisors may be proclined.
    • Perhaps as the result of a habit or an adaptive swallow; or upright, with the increased overjet reflecting the skeletal pattern.
    • The overbite is often increased, but may be incomplete as a result of an adaptive tongue-forward sward swallow, a habit or increased vertical skeletal proportion.
    • The latter two factors are marked, an anterior open bite may result.
  • 9.
    • If the lips are grossly incompetent and are habitually apart at rest, drying of the gingivae may lead to an exacerbation of any pre-existing gingivitis .
    • The molar relationship usually reflects the skeletal pattern unless early deciduous tooth loss has resulted in mesial drift of the first permanent molars
  • 10. Assessment of, and treatment planning
    • Factor should be considered before deciding upon a treatment plan:
    • 1-The patient’s age.
    • 2-The difficulty of treatment.
    • 3-The likely stability of reduction.
    • 4-The patient’s facial appearance.
  • 11. Practical Treatment planning
    • In general class2 division1 malocclusions are commonly
    • associated
    • with increased overbite, which must be reduced before the overjet
    • can be reduced.
    • Overbite reduction requires space (about 1-2 mm for an averagely
    • increased overbite).
    • Significantly increased overbites will require more space and fixed
    • appliances, or even surgery.
  • 12.
    • If extraction are required in the lower arch, both spontaneous and
    • active tooth movement are facilitated by removal of the
    • corresponding
    • tooth in the upper arch.
    • The actual choice of extraction site will depend upon the presence
    • of
    • crowding, the tooth movements planned, and their anchorage
    • requirements.
  • 13. In a Moderate to Severe Class2 skeletal pattern:
    • 1-Growth modification.
    • 2-Orthodontic camouflage using fixed appliances.
    • 3-Surgcalcorrection.
  • 14.
    • Thank You