Risk analysis of the micro-implant insertion in the infrazygomatic crest area

Objective The purpose of this study was to measure the bone depth of the infrazygomatic crest area in adults using cone beam computed tomography (CBCT) to analyze the risk of maxillary sinus perforation or root injury during micro-implant insertion. Methods The CBCT data of 60 adult patients were collected. Multiple measurements of the bone depth were performed at different slices. The data were analyzed statistically. Results The minimal bone depth was (2.27±1.72) mm, which was measured at the slice of the mesial-buccal root of the maxillary first molar. The maximal bone depth was (7.24±2.51) mm , which was measured at the slice of the mesial-buccal root of the maxillary second molar. The bone depth increased gradually from the distal-buccal root of the maxillary first molar to the mesial-buccal root of the maxillary second molar. Conclusions The sites suitable for micro-implant insertion lie in the interradicular space of the maxillary first and second molars. There is a high risk of maxillary sinus perforation or root injury during micro-implant insertion in the infrazygomatic crest area. Key words: Infrazygomatic crest; Micro-implant; Risk