Table 3.

Classification of the outcome of osteotomy preparation

Outcome	Definition	Example
Perforation	A discrete defect of the lingual surface or a dehiscence of the lingual surface >5 mm from the level of the crest of the ridge. A dehiscence was defined as a vertical defect, with no superior border, in the superior/inferior dimension
Near miss	An osteotomy that was closer than 1 mm from the lingual surface of the duplicate mandible
Safe	An osteotomy that was no closer than 1 mm from the lingual surface of the duplicate mandible. Perforations or dehiscences through the labial surface were recorded as safe