Bridging Plate Development for Treatment of Segmental Bone Defects of the Canine Mandible: Mechanical Tests and Finite Element Method

Autor(es)

de Freitas, Elisangela Perez ; Rahal, Sheila Canevese ; Shimano, Antonio Carlos ; Lopes da Silva, Jorge Vicente ; Noritomi, Pedro Yoshito ; El-Warrak, Alexander Oliveira ; Melchert, Alessandra

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF VETERINARY DENTISTRY; v. 33, n. 1, p. 18-25, MAR 2016.
• Citações Web of Science: 1

Resumo

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 plate-mandible system resists the bite forces in all dog breeds. All safety factors were greater than 1 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. (AU)

• Processo FAPESP: 11/08610-7 - Placa em ponte projetada e analisada por elementos finitos para reconstrução de defeito ósseo segmentar em mandíbula de cães
• Beneficiário: Sheila Canevese Rahal
• Modalidade de apoio: Auxílio à Pesquisa - Regular