title: Pretapped and self-tapping screws in the human midface. Torque measurements and bone screw interface.
abstract: Better contact between AO miniscrews and the bone and greater resistance against torque are achieved in the human midface if the thread is not pretapped. This was demonstrated by 60 methacrylate fixed human midfacial bone sections and by 100 torque measurements. It is concluded that pretapping is not to be recommended in the thin bone of the midface.
authors.affiliation: Department of Oral and Maxillo-Facial Surgery University Hospital, Freiburg, West Germany.
authors.forename: W
authors.initials: W
authors.lastname: Bähr
mesh_terms: D001696:Biomechanical Phenomena; D001863:Bone Screws; D016009:Chi-Square Distribution; D004867:Equipment Design; D005147:Facial Bones / Q000601:surgery*; D005593:Fracture Fixation, Internal / Q000295:instrumentation; D006801:Humans; D012399:Rotation; D013314:Stress, Mechanical; D013499:Surface Properties