Evaluation of dento-skeletal vertical changes associated with en masse skeletally anchored distalization of the maxillary posterior segment in class II patients; A randomized clinical trial

Document Type : Original Article

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Department of Orthodontics, Faculty of Dentistry, Sinai University, Arish, Egypt

Abstract

INTRODUCTION: Distalization is now a ubiquitous Orthodontic non-extraction treatment option for Class II that benefits from novel anchorage options by miniscrews and other temporary anchorage devices.
OBJECTIVES assess vertical changes during en masse distalization of the maxillary posterior segment using two different skeletally anchored distalizers.
METHODOLOGY: 22 subjects (8 males, 14 females, average age 15.3 ± 1.2 years) were assigned in a randomized assortment to 2 groups, group I modified Hyrax, group II received modified Distal Jet distalizer, both appliances were anchored by miniscews to the palate and a 2 mm thickness Essix retainer was fitted to the lower dentition. Full skull cone beam computed tomography (CBCT) were taken afore insertion of distalization devices (T1) then later at 8 months of distalization (T2)
RESULTS: In group-I, average right first upper molar crown vertical distance decreased by 2.3 mm(p≤0.001), and average of of 4.1 (p≤0.001) in the left side. In group-II, average right first molar crown vertical distance (mm) decreased by 3.2 (p≤0.001), and an average of difference 3.4 (p≤0.001) in the left side. FMA decreased by 2.8±1.3 (p 0.04) and 2.6±2.05 (p 0.039) in Groups I and II respectively
CONCLUSION: both distalizers can produce intrusion movement to the maxillary first molar when used with Essix retainer in the lower arch, with a noted decrease in FMA.

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