title: Bridging Plate Development for Treatment of Segmental Bone Defects of the Canine Mandible: Mechanical Tests and Finite Element Method.
abstract: With regard to the canine mandible, a mistaken concept of application is to assume that systemic plate-bone resistance is provided by the implant so that biomechanical position could be ignored. Because the alveolar border of the mandible is a tensile zone, the plate would ideally be positioned near this area while avoiding important structures. The aim of this study was to develop 2 bridging plates for the treatment of a segmental bone defect of the canine mandible using monocortical screws to avoid damage to the tooth roots and remaining neurovascular structures. Computed tomography images of the heads of 4 dogs (rottweiler, Doberman, boxer, and miniature poodle breeds) were used as models to develop the project. The images were reconstructed in 3-dimensional (3D) format. For each dog breed, 6 mandible prototypes were produced, each with a segmental bone defect in the right mandible. The mandibular reconstruction was performed with pure titanium bridging plate and locking screws. One plate model was developed for medium- and large-breed dogs and another for small-breed dogs. Mechanical testing showed the platemandible system resists the bite forces in all dog breeds. All safety factors were greater than I in the platemandible system for medium- and large-breed dogs and greater than 10 in the plate-mandible system for small-breed dogs. Thus, bridging plates designed with differentiated geometry and monocortical locking screws showed mechanical resistance to support simulated induced bone model defects and were able to support at least 5 times the value of bite force for each evaluated dog.
authors.forename: Elisângela Perez
authors.initials: EP
authors.lastname: de Freitas
authors.forename: Sheila Canevese
authors.initials: SC
authors.lastname: Rahal
authors.forename: Antonio Carlos
authors.initials: AC
authors.lastname: Shimano
authors.forename: Jorge Vicente Lopes
authors.initials: JV
authors.lastname: da Silva
authors.forename: Pedro Yoshito
authors.initials: PY
authors.lastname: Noritomi
authors.forename: Alexander Oliveira
authors.initials: AO
authors.lastname: El-Warrak
authors.forename: Alessandra
authors.initials: A
authors.lastname: Melchert
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D001732:Bite Force; D001860:Bone Plates / Q000662:veterinary*; D001863:Bone Screws / Q000662:veterinary; D003813:Dentistry / Q000662:veterinary*; D004285:Dogs / Q000002:abnormalities / Q000601:surgery*; D020342:Finite Element Analysis; D008334:Mandible / Q000002:abnormalities / Q000601:surgery*; D013045:Species Specificity