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A 3x18 mm drill is used to finish osteotomy at #27 (Fig.3). A 3.8x13 mm UF implant (Fig.3 green line) will be placed with 9 mm in the apparently solid, native (new) bone (blue line), while the coronal 5 mm of the socket will be occupied by the 5 mm cuff of a cemented abutment (pink line). The white dashed line is the gingival margin. The osteotomy is initiated as lingual as possible so that there will be at least 2 mm buccal gap when the narrow implant is placed.
Since the ridge between the lower canines is atrophic (Fig.2), osteotomy starts at #23 and 25 after crestal reduction (to make the sites wider buccolingually, Fig.4 arrowheads).
When the 3.8x13 mm implant is placed, there is a mesial defect (*), which will be bone grafted.
Xin Wei, DDS, PhD, MS 1st edition 02/02/2017, last revision 05/12/2020