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RESEARCH PRODUCT

Photoelastic analysis of conventional and locking system for treatment of mandibular angle fractures with a single plate

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Made available in DSpace on 2021-06-25T10:28:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-04-01 Background: This photoelastic analysis evaluated stress distribution in different osteosynthesis systems, conventional and locking, used for treatment of mandibular angle fractures with a single plate. Material and Methods: Angle fractures were simulated in mandibles made of photoelastic resin. Following Champy’s method, plate osteosynthesis was performed. The samples were divided into five groups: Group 1, non-fractured mandible; Group 2, two screws were installed in each segment using a conventional system; Group 3, two screws were installed in each segment using a locking system; Group 4, three screws were installed in the proximal segment and four screws in the distal segment using a conventional plate; Group 5, three screws were installed in the proximal segment and four screws in the distal segment using a locking plate. In universal testing machine coupled to a polariscope, a load was applied to the first molar 10 times. The 50 images were randomly numbered and analyzed qualitatively and quantitatively by two raters. Results: The locking system promoted better stress distribution along the osteosynthesis. The locking system redu- ced stress magnitude in the distal segment, with a significant between-group difference (P≤ 0.001). Conclusions: The locking plate/screw system can distribute stress more evenly throughout the osteosynthesis, especially when long seven-hole plates are used. Department of Oral and Maxillofacial Surgery Universidade do Oeste Paulista (UNOESTE), R. José Bongiovani, 700 Department of Prosthodontics UNOESTE, R. José Bongiovani, 700 Department of Health Sciences Universidade do Sagrado Coração, R. Irmã Arminda, 10-50 Department of Dental Materials and Prosthodontics School of Dentistry Universidade Estadual Paulista (UNESP) Department of Oral and Maxillofacial Surgery Universidade do Sagrado Coração, R. Irmã Arminda, 10-50 Department of Dental Materials and Prosthodontics School of Dentistry Universidade Estadual Paulista (UNESP)