A avaliação da resistência de união de uma resina fresada e uma resina impressa ao cimento 4-meta/mma-tbb
Carregando...
Data
Autores
Orientador
Borges, Alexandre Luiz Souto 
Coorientador
Souza, Karina Barbosa
Pós-graduação
Curso de graduação
São José dos Campos - ICT - Odontologia
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Tipo
Trabalho de conclusão de curso
Direito de acesso
Acesso restrito
Resumo
Resumo (inglês)
Objective: To evaluate the bond strength of a milled resin and a 3D-printed resin to a 4-META/MMA-TBB cement. Materials and Methods: Blocks measuring 14.5 × 14.5 × 2 mm (n = 12) were fabricated using a nanohybrid ceramic resin (Grandio® blocs) for milling and a 3D printing resin (V-Print DentBase®). The specimens were polished with silicon carbide papers of decreasing grit sizes (#600, #800, and #1200), cleaned in distilled water using an ultrasonic bath for 360 seconds, and then dried. Subsequently, the specimens were embedded in chemically activated acrylic resin inside PVC tubes. Silicone matrices with an internal diameter of 1 mm were adapted to the specimen surfaces with the aid of wax. A 4-META/MMA-TBB cement was manipulated according to the manufacturer’s instructions and inserted into the matrices, producing five cement cylinders (Ø = 1 mm; h = 2 mm) on the surface of each specimen, totaling 12 cylinders per group. The samples were stored in an incubator at 37 °C for 24 hours. Afterwards, a micro-shear bond strength test was performed using a stainless-steel wire (Ø = 0.25 mm) at a crosshead speed of 0.5 mm/min and a 100 kgF load cell. Additional analyses were carried out to assess surface roughness (Ra, Rq, and Rz), wettability, and surface/interface characteristics using scanning electron microscopy (SEM). Results: The groups untreated with aluminum oxide blasting showed a high rate of pre-test failures. Among the surface-treated groups, no significant differences in bond strength were observed between the milled and printed resins. Surface roughness values were higher for the milled resin after surface treatment. No significant differences in contact angles were found among the tested groups. Discontinuities at the cement–restorative material interface were observed in the SEM images. Conclusion: Based on the results, the 4-META/MMA-TBB cement exhibited low bond strength to both the milled and printed resins under the surface treatments performed.
Resumo (inglês)
Objective: To evaluate the bond strength of a milled resin and a 3D-printed resin to a 4-META/MMA-TBB cement. Materials and Methods: Blocks measuring 14.5 × 14.5 × 2 mm (n = 12) were fabricated using a nanohybrid ceramic resin (Grandio® blocs) for milling and a 3D printing resin (V-Print DentBase®). The specimens were polished with silicon carbide papers of decreasing grit sizes (#600, #800, and #1200), cleaned in distilled water using an ultrasonic bath for 360 seconds, and then dried. Subsequently, the specimens were embedded in chemically activated acrylic resin inside PVC tubes. Silicone matrices with an internal diameter of 1 mm were adapted to the specimen surfaces with the aid of wax. A 4-META/MMA-TBB cement was manipulated according to the manufacturer’s instructions and inserted into the matrices, producing five cement cylinders (Ø = 1 mm; h = 2 mm) on the surface of each specimen, totaling 12 cylinders per group. The samples were stored in an incubator at 37 °C for 24 hours. Afterwards, a micro-shear bond strength test was performed using a stainless-steel wire (Ø = 0.25 mm) at a crosshead speed of 0.5 mm/min and a 100 kgF load cell. Additional analyses were carried out to assess surface roughness (Ra, Rq, and Rz), wettability, and surface/interface characteristics using scanning electron microscopy (SEM). Results: The groups untreated with aluminum oxide blasting showed a high rate of pre-test failures. Among the surface-treated groups, no significant differences in bond strength were observed between the milled and printed resins. Surface roughness values were higher for the milled resin after surface treatment. No significant differences in contact angles were found among the tested groups. Discontinuities at the cement–restorative material interface were observed in the SEM images. Conclusion: Based on the results, the 4-META/MMA-TBB cement exhibited low bond strength to both the milled and printed resins under the surface treatments performed.
Descrição
Palavras-chave
Propriedades de superfície, Cimentos dentários, Cimentos de resina, Resistência ao Cisalhamento, Dental cements, Resin cements, Shear strength, Surface properties
Idioma
Português
