Classificant of surgical difficulty in extracting impacted third molars

摘要

Few studies have attempted to analyse preoperative factors that complicate the surgical removal of impacted mandibular third molars. We studied this problem in two steps. We found that difficulty in extrac- tion is associated with depth(depth is deep occulusal level: level C), ramus relationship/space available(ramus relationship/space available is no space: class 3), width of root(the width of the middle root is thicker than that of the neck an the roots do not separate, incomplete roots excluded: bulbous), or a combination of these fac- tors. The index was tested in 20 patients whose extractions were difficult, and 24 in whom they were not.