Publicação
Development and fabrication of conical-shaped channels on zirconia and PEEK materials by Nd:YAG laser regarding fiber integration of dental implants
| Resumo: | Teeth loss correction by dental implants is far from being the perfect solution, due to its rigid connection to the bone, instead of having the more dynamic natural periodontal ligament fiber connection. This dissertation aims to develop samples (zirconia and PEEK) with conical-shaped channels with the objective of the created surfaces able to restore the periodontal ligament fibers' natural irrigation, which can be incorporated in the future on root analogue implants. During this dissertation, numerous Nd:YAG laser perforations of these samples were made, focused on parameter optimization and machining strategy until reached the smallest complete perforation through the samples. The best perforation for zirconia was P 90%, V 6 mm/s and N 50000 for 13 repetitions, lowering the laser 0.095 mm each time, with air for debris removal, dry and doing the line segment strategy. PEEK’s perforation was similar but with P 60%, V 6 mm/s and N 90000 for only 1 repetition. After that, in vitro tests were made to verify the periodontal ligament’s fibroblasts and the bacteria's behavior in the presence of conical-shaped channels. Fibroblast viability and adhesion and the number of bacteria present in the samples was studied. In the end, successful complete perforations were achieved with promising small diameters and very satisfactory levels of fibroblast viability and adhesion. It was also observed some bacterial movement through the channels but restricted. This dissertation was able to prove that it is possible to create and recreate conical-shaped channels on different samples, small enough to be comparable to dentinal tubules, having the channel’s diameters on zirconia going from 158.371 ± 51.086 μm to 32.035 ± 18.643 μm and on PEEK from 131.789 ± 3.5527 μm to 17.851 ± 4.099 μm. The channels were still able to guarantee fluid movement through them while also offering good fibroblast viability and adhesion and restricting some bacterial movement through them. |
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| Autores principais: | Oliveira, David de Andrade |
| Assunto: | Zirconia PEEK Conical-shaped channels Nd:YAG laser Dental implant fiber integration Zircónia Canais com forma cónica Integração de fibras em implantes dentários |
| Ano: | 2023 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso embargado |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Teeth loss correction by dental implants is far from being the perfect solution, due to its rigid connection to the bone, instead of having the more dynamic natural periodontal ligament fiber connection. This dissertation aims to develop samples (zirconia and PEEK) with conical-shaped channels with the objective of the created surfaces able to restore the periodontal ligament fibers' natural irrigation, which can be incorporated in the future on root analogue implants. During this dissertation, numerous Nd:YAG laser perforations of these samples were made, focused on parameter optimization and machining strategy until reached the smallest complete perforation through the samples. The best perforation for zirconia was P 90%, V 6 mm/s and N 50000 for 13 repetitions, lowering the laser 0.095 mm each time, with air for debris removal, dry and doing the line segment strategy. PEEK’s perforation was similar but with P 60%, V 6 mm/s and N 90000 for only 1 repetition. After that, in vitro tests were made to verify the periodontal ligament’s fibroblasts and the bacteria's behavior in the presence of conical-shaped channels. Fibroblast viability and adhesion and the number of bacteria present in the samples was studied. In the end, successful complete perforations were achieved with promising small diameters and very satisfactory levels of fibroblast viability and adhesion. It was also observed some bacterial movement through the channels but restricted. This dissertation was able to prove that it is possible to create and recreate conical-shaped channels on different samples, small enough to be comparable to dentinal tubules, having the channel’s diameters on zirconia going from 158.371 ± 51.086 μm to 32.035 ± 18.643 μm and on PEEK from 131.789 ± 3.5527 μm to 17.851 ± 4.099 μm. The channels were still able to guarantee fluid movement through them while also offering good fibroblast viability and adhesion and restricting some bacterial movement through them. |
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