1. Maxillary Fragment Stabilization After Le Fort I Fracture With 1 Screw Pair per Plate
- Author
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Vedran Uglešić, Lovro Grgurević, Nenad Drvar, Predrag Knežević, Janoš Kodvanj, and Jakša Grgurević
- Subjects
Models, Anatomic ,Bone Screws ,Fracture site ,Dentistry ,Maxillary Fractures ,Contact force ,Fracture Fixation, Internal ,Fixation (surgical) ,Imaging, Three-Dimensional ,Alveolar Process ,Image Processing, Computer-Assisted ,Maxilla ,Photography ,Postoperative results ,Humans ,Medicine ,Nasal Bone ,Orthodontics ,Zygoma ,business.industry ,Experimental model ,Experimental research ,Biomechanical Phenomena ,Otorhinolaryngology ,Strain distribution ,Surgery ,Stress, Mechanical ,Oral Surgery ,business ,Bone Plates ,Plastics - Abstract
Purpose The aim of the present study was to determine whether plates with only 1 screw pair can be used for Le Fort I fracture management. Good postoperative results motivated the direct application of mandible fixation principles to the fractured midface region without additional experimental research. However, the amount and distribution of the forces in the midface region is different from those on the mandible. Materials and Methods Testing was conducted on plastic anatomic models. The validity of the experimental model was tested before the fixation techniques were compared. Standard miniplates and miniscrews were used for fixation of the maxilla. The model surface strain analysis was conducted using the noncontact object grating method, which enabled the surface strain measurement without direct influence on the measured model. Results In 2 screw pair fixation, the outer screw pair has little effect on the local strain distribution, but it lowers the contact forces along the crack. One screw pair fixation is stable enough for fixation, but it has a greater strain peak at the crack edges. Conclusion Our results showed that 1 screw pair per plate was enough for stable fixation, and 2 or more screw pairs should only be used when the bone fragment at the fracture site cannot sufficiently transmit forces along the crack.
- Published
- 2011
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