These should be identified at dental age 8 or 9, soon after the adult incisors erupt. This incisor relationship has the potential to restrict maxillary development and encourage mandibular growth, thereby worsening the Class III problem. This is similar to the effect of a functional appliance in Class II treatment.
Normally, such displacements can be corrected by simple tooth movements, and it is important for treatment to be provided at an early age. Subsequently, unrestricted maxillary development can resume, and if the condyles are centered in the fossae, this will eliminate the potential 'functional appliance' effect of the original mandibular displacement.
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