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The ridge top is trimmed with surgical handpiece after incision. Following pointed drill, the cylindrical part of the 2.2x8.5 mm drill cannot engage to the metal sleeve with 10.5 mm offset. The guide has to be removed. The first 1-2 mm osteotomy has to be done free hand before reuse of the guide and the drill. Nevertheless, the osteotomy is precise buccolingual when it is finished (Fig.1).
Xin Wei, DDS, PhD, MS 1st edition 09/10/2019, last revision 09/10/2019