Banca de DEFESA: CLARICE GONRING CORRÊA
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : CLARICE GONRING CORRÊA
DATE: 08/03/2022
TIME: 09:00
LOCAL: Instituto de Veterinária
TITLE:
Customized production of polycaprolactone polymeric implant for humerus fracture correction in birds validated by the finite elements method and made by additive manufacturing printed mold.
KEY WORDS:
polymer, osteosynthesis, finite elements, carijó hawk, humerusPAGES: 52
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Clínica e Cirurgia Animal
SPECIALTY: Técnica Cirúrgica Animal
SUMMARY:
The correction of fractures in birds has several challenges, ranging from species size to affected bone. Fractures in pneumatic bones, such as the humerus, can cause large damage to the animal, as they have an important function in thermoregulation and in flight and, therefore, require accurate treatment. Also, for the mentioned bone, anatomical particularities, such as the helical shape and the low soft tissue coverage over the bone, may favor greater surgical complications. Methods of fixation on bird fractures are challenging and are constantly improving. A large diameter medullary canal and a thin, hard cortical canal increase the risk of iatrogenic fractures during the osteosynthesis procedure. To aid in the diagnosis, planning and treatment of challenging cases, new technologies have been used in veterinary medicine, allowing difficult resolution problems to be increasingly studied and solutions to be developed from computer programs and three-dimensional impressions, contributing, for example, to the customization of orthopedic implants to an animal or a specie. To complement the study and development of orthopedic implants, finite element technology can be applied. Through a computer program, the method assists in the improvement of the implants, predicting and verifying possible results that can be confirmed through universal testing. Finite elements allow mechanical test simulations to be performed repeatedly. In this way, it is possible to consider different situations and correct possible flaws in the implants before they are made, avoiding repetitive physical tests and preserving study material, such as animal cadavers. The present study aims to evaluate the polymeric plate for osteosynthesis, planned from a model previously developed for use in a hawk humerus (Rupornis magnirostris). The model consists of plate with perforations and grooves that allow its fixation by cerclage and hemi cerclage. The polymer implant was tested from computational trials using the finite elements method. After validation, it was sent to be made in polycaprolactone (PCL) through heating and pressing in a split mold printed by additive manufacturing. In a cadaver application trial, the advantages of the PCL implant were observed, which allows adjustments in its dimension as well as perforations in various locations at the time of surgery, adapting to the individual characteristics of the patient and the type of fracture. It was concluded that the use of PCL for the preparation of the orthopedic implant is valid for the low cost of the polymer (in relation to the materials already used for the production of implants), for the ease of molding by heating (due to its low melting point) and increasing access to material and three-dimensional printers. The planning and customization of orthopedic implants suitable for the patient and the bone structure generated in this study a simple and easily replicable method of making polymeric plate, which can be a valuable resource in orthopedic surgery of birds.
BANKING MEMBERS:
Presidente - 387386 - MARTA FERNANDA ALBUQUERQUE DA SILVA
Interna - 2932766 - ANDRESSA FERREIRA DA SILVA SPYRIDES
Interno - 2318733 - DANIEL DE ALMEIDA BALTHAZAR
Externo ao Programa - 387017 - ALEXANDRE MIGUEL DO NASCIMENTO
Externa à Instituição - MARIA DE LOURDES GONÇALVES FERREIRA - UFF
Externa à Instituição - MÁRCIA CAROLINA SALOMÃO SANTOS - UFF
Externa à Instituição - VIVIANE ALEXANDRE NUNES DEGANI - UFF