Q. I am on twin block therapy for Class 2 malocclusion. How to prevent retroclination of upper incisors?

Answered by
Dr. Bharat Joshi
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Mar 25, 2021

Hello doctor,

I am 22 years old male. I had a Class 2 overbite issue due to a short mandible. My functional orthodontist started twin block therapy. I have read few medical articles about how they work. Twin blocks cause retroclination of maxilla incisors and proclination of mandible incisors. Personally, my maxillary incisors seem fine, as said by my doctor, and my mandible is short. Will the functional therapy of twin blocks reduce my upper lip or maxillary protrusion? If so, then my maxillary bone will reduce, or just the upper front teeth will slightly point inwards to complete my overbite? I want my mandible to grow forward, and I do not want to reduce my maxillary length. I am concerned about the retroclination of upper incisors.



Welcome to

I appreciate that you have studied and undergone so many articles about the twin block. Yes, it causes proclination of mandibular teeth and retroclination of maxillary teeth. But the advantage you are having is you are in the phase of active growth, so the movement of teeth will definitely modify the position of the maxilla and mandible but not inhibit their growth. Also, for stability, you will be given retainers like Frankel. So do not worry, have your treatment done.

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