The space between #4 and 6 (Fig.7 *) is to be closed by a closed spring between.#3 and 6, whereas the space mesial to #30 (Fig.4) will be closed by power chain between #28 and 30. Placed are .016x.016" stainless steel wires. In fact the upper limited ortho is prematurely terminated at the patient's request.
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Xin Wei, DDS, PhD, MS 1st edition 09/27/2014, last revision 05/10/2015