One of the most read posts of this blog, is the recent W.Clark article at the JO. The Twin Block is a widely used functional appliance, and its creator advocates that his 30 years experience has taught him, that there is no need for a facial bow at the upper plate of the appliance.
A group of scientists from King's College university, have performed a RCT, to test the above hypothesis. What they find is that indeed the use or not of a facial bow at the upper plate of the twin block, does not seem to influence significantly the treatment results.
Construction of the Twin Block with and without a facial bow.
For further information please refer to the ahead of print of The Angle Orthodontist, at this link
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