A modified three-piece base arch for en masse retraction and intrusion in a Class II Division 1 subdivision case

Abstract

This case report describes the orthodontic treatment of an 18-year-old male patient who presented with the prognathic maxilla, deep bite, low mandibular plane angle, and proclined incisors. Modified three-piece base arch was used for the intrusion and retraction of maxillary incisor. En masse retraction was achieved in 6 months. Reduced time for retraction was attributed to a single stage of retraction, unlike burrstone three-piece intrusion base arch where canines are individually retracted followed by retraction of incisors. A modified utility arch was used in lower arch followed by a continuous archwire technique. The case was finished using bite settling elastics on a continuous archwire. The step between canine and premolar was corrected in the finishing phase of treatment. The final treatment outcomes were satisfactory, and true intrusion was achieved with proper selection of biomechanics.