Development of a new concept of zirconia and PEEK dental implant

• Autor(a) principal: Silva, Ana Jorge Pereira da
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/36200
• topic: Dental implants; Zirconia implants; PEEK infiltration; Hybrid structures; Biomechanical analysis

Recently, the modern world of dentistry has looking for alternatives to metallic dental implants and the use of ceramic implants such as Zirconia are a solution to consider. However, the hardness of the material limits the applications in the field of implantology, although it has excellent biocompatibility and aesthetic matching properties. Combining a ceramic material like Zirconia with a polymer like PEEK can influence the mitigation of stresses and counteract the hardness of Zirconia. This dissertation aims to development the new concept of hybrid dental implants of Zirconia and PEEK, through the study of the numerical simulation of dense implants, and hybrid, as well as the osseointegrated model and implanted in the mandible using CAD software. This numerical analysis is performed simultaneously with the experimental analysis consisting of the exploration of the prototype development process and subsequent infiltration of the porous implant. The experimental analysis consisted of the evaluation of the process of development and infiltration through the electron microscope and reconstruction through microtomography. The most common defects found in the dense prototypes were cracks resulting of the contraction of zirconia during the sintering step of the manufacturing process and in the porous prototypes it was common to find obstructions of the porous resulting of overpolymerization and difficulty cleaning the pores of excess slurry after printing. The results corroborate the initial hypothesis that hybrid implants are able to withstand loads higher than pre-infiltration implants, when subjected to compression tests. When considering the stress results subject to 200 N, the dense, porous and hybrid implant prototypes present similar results. However, as the test progresses to collapse, the dense, hybrid, and porous implant fails, in order respectively. Regarding the effect on supporting bone, the numerical analysis of the osseointegrated hybrid model indicates that the loading can be supported by the bone without it suffering microdamages, supporting the initial hypothesis that using a polymer/ceramic composite material would cause less strain on the bone than a monolithic zirconia implant.