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Osteotomies at #11-13 are initiated through a surgical stent prior to incision. The ridge at #11 is narrow. The osteotomies are distalized as shown in Fig.3 white circles; the ridge is split with 13 mm wheel saw. Since the buccal plate is softer than the palatal one, ridge split is closer palatally (black line). If the split is too buccal, the buccal plate may fracture under pressure of bone expansion later on.
Xin Wei, DDS, PhD, MS 1st edition 06/23/2016, last revision 06/23/2016