Pre-tapped and self-tapping screws in children's mandibles. A scanning electron microscopic examination of the implant beds.
One hundred 2 mm AO miniscrews were inserted into the mandibles of eight fresh cadavers aged 8 to 12 years. Scanning electron microscopic examination of the implant beds showed cracks and accumulated bone material, as well as signs of crushing and shearing stress, regardless of whether the screws were pre-tapped or not. When, during screw insertion, the axis of the screw deviated by at least 10 degrees from the axis of the tap, two intersecting threads resulted. It is concluded that during osteosynthesis in child mandibles pre-tapping is not recommended.
Bähr
W
W
Department of Oral and Maxillofacial Surgery, University Hospital, Freiburg, Germany.
Stoll
P
P
D001863:Bone Screws; D002648:Child; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000473:pathology / Q000601:surgery / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods