After increasing the access (Fig.4, as compared to Fig.3), trying to change trajectory and increasing the depth and diameter of the osteotomy, the latter deviates further, distal (Fig.5). 即使改变先锋钻方向，后来钻头和植体方向还是不好（图五，六）。

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Xin Wei, DDS, PhD, MS 1st edition 07/09/2020, last revision 10/01/2020