title: [Osteosynthesis of the middle third of the face. A comparative analysis of screws inserted with or without preliminary tapping].
abstract: Results of osteosynthesis of middle third of face were compared after insertion, with or without pre-tapping, of more than 400 miniscrews (AO, 2 mm diameter). The parameters measured were the torque, the screw/bone interface and the morphology of the implant bed. The screw/bone area of contact was large and the torque superior in the absence of pre-tapping. Greater screw retention values were also be gained by applying the miniscrews without pre-tapping in cases where bone thickness does not exceed 5 mm. Pre-tapping would appear to be indicated when the bone is thicker, to make screw insertion easier and to prevent its fracture during insertion.
authors.affiliation: Universitätsklinik für Zahn-, Mund- und Kieferheilkunde, Freiburg, Allemagne.
authors.forename: W
authors.initials: W
authors.lastname: Bähr
mesh_terms: D001863:Bone Screws; D003393:Cranial Sutures / Q000601:surgery; D004867:Equipment Design; D005147:Facial Bones / Q000601:surgery*; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods*; D005624:Frontal Bone / Q000601:surgery; D006801:Humans; D009915:Orbit / Q000601:surgery; D012399:Rotation; D013314:Stress, Mechanical; D015050:Zygoma / Q000601:surgery