DIO 1.3/2.3 mm and 1.7/3.1 mm expanders are able to be inserted ~ 9 mm without obvious buccal plate deformity.  When 2.4/3.7 mm expander is being used < 8 mm deep, the most coronal buccal plate starts to bulge (Fig.2,3 *).  Two oblique accessory bony cuts (black arrow) are added without effect.  A 3.2x8.5 mm drill is used mainly against the lingual wall (white arrow) prior to placement of a 4x8.5 mm implant (Fig.4).

1-Staged Ridge Split Last Next

Xin Wei, DDS, PhD, MS 1st edition 01/27/2016, last revision 07/27/2018