Influência do método de obtenção de copings e aplicação de cerâmica na adaptação marginal e interna de coroas metalocerâmicas

• Autor(a) principal: Kunz, Patrícia Valéria Manozzo
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório do Centro Universitário Braz Cubas
• Texto Completo: https://repositorio.cruzeirodosul.edu.br/handle/123456789/2072
• topic: Odontologia clínica; Coroa do dente; Técnica de fundição odontológica.; Ligas metalo-cerâmicas; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The objective of this study was to evaluate the influence of the fabrication methods of Co-Cr copings and the veneering technique on the marginal and internal fit of metalceramic crowns. Two identical master models in acrylic resin were used, representing a preparation for full metallo-ceramic crowns in the lower molar. Co-Cr copings were prepared using the following methods: lost wax (casting) and sintered block CAD-CAM machining of sintered block. The marginal and internal fit was analyzed using the silicone replica technique, in four specific points: marginal adaptation (MG), axial wall adaptation (AW), adaptation in the axial-occlusal angle adaptation (AO) and the centralocclusal adaptation (CO). After this initial analysis, a veneering ceramic was applied on the copings using two techniques (vibration-condensation and heat-pressing).The marginal and internal fit were determined again, using the same technique and evaluation points. Data were analyzed statistically by paired and unpaired Student t test (α = 0.05). The initial adaptation showed statistically significant differences for cast and milled copings at AO (106.75 µm e 122.89 µm) and CO (113.19 µm e 140.20 µm). MG and AW presented statistically similar means. For each of the copings fabrication methods, there was no statistically significant difference between the different techniques for applying the veneering ceramics in all the evaluated points. For the cast copings, in both coating techniques (vibration-condensation and pressing), it can be observed that there was a statistically significant difference in MG (109.13 µm and 102.78 µm / 106.41 µm and 97.46 µm) and CO (112.86 µm and 104.07 µm / 113.53 µm and 107.09 µm). For AW and AO there was no statistically significant difference between the coping before and after the application of the veneering ceramic. For the CAD-CAM milled copings and vibration-condensation application technique, there was a statistically significant difference only for AO (116.39 µm e 108.54 µm). For the heatpressed technique, there was no statistically significant difference for any of the evaluated points. It can be concluded that the method for coping fabrication influed the internal fit. In the AO and CO, the cast copings showed better internal adaptation. Regarding the marginal adaptation, there was no difference between the two methods. For both fabrication methods of copings, the technique of applying the veneering ceramics (vibration-condensation or pressed) did not influence the final marginal and internal fit of metal-ceramic crowns, in all evaluated points.