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When the flaps are raised, the ridge is triangular with the lingual plate (Fig.2 *) higher than the buccal one. Because of the slope, the multiple-drill approach is adopted in stead of single-drill one, because the marking bur is wobbling after 1.6 mm osteotomy at 13 mm (Fig.3).
Xin Wei, DDS, PhD, MS 1st edition 12/06/2016, last revision 01/25/2020