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It appears that a narrow implant should be placed at #30 and should be able to sustain functional loading. After ridge reduction at #30 (Fig.3 ^) and extraction and debridement at #29, osteotomies at these sites are initiated with 1.2 mm and 2 mm drills, respectively. Probably due to low bone density, the osteotomy at #29 drops deep and close the Mental Loop (red dashed line). The large distal defect at #29 (*, most likely due to post-related perforation) is later filled with bone graft (data not shown).
Xin Wei, DDS, PhD, MS 1st edition 06/19/2017, last revision 07/10/2021