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Resistência adesiva entre resinas acrílicas CAD – CAM e resinas de rebasamento submetidas a envelhecimento físico e químico
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Objetivo: Avaliar a resistência adesiva a tensões de cisalhamento de resinas acrílicas de base de prótese impressas a resinas acrílicas de rebasamento convencionais, após envelhecimentos físico e químico.
Materiais/Métodos: Sessenta espécimes (10×10×3,3mm) de duas resinas acrílicas de base de prótese removível impressas em 3D (V-Print Dentbase e Denture 3D+) e de outra produzida convencionalmente (ProBase Hot - controlo), foram rebasadas com duas resinas acrílicas Ufi Gel Hard C – para rebasamento direto na cavidade oral - e Probase Cold, para rebasamento indireto laboratorial (n=10). Os espécimes rebasados foram submetidos a 1000 ciclos de flutuações térmicas (5ºC e 55ºC) e imersos alternadamente em saliva artificial com pH=3 (8h/dia) e pH=7 (16h/dia) durante 28 dias. Testou-se a resistência adesiva a tensões de cisalhamento numa máquina de testes universal (Instron Modelo 4502) a velocidade de 1mm/min. O tipo de falha de união foi avaliado através de um estereomicroscópio. Os resultados foram analisados estatisticamente (teste de Kruskal-wallis, testes t), estabelecendo- se significância de 5%.
Resultados: Os valores de resistência adesiva a tensões de cisalhamento variaram de 9,8 2,80 a 21,5 5,00 MPa. Não se verificaram diferenças significativas entre resinas acrílicas de base de prótese quanto à resistência adesiva a tensões de cisalhamento (p= 0,07). Para as resinas de base de prótese impressas não foram encontradas diferenças (p<0,07). No entanto, a resina Probase Hot rebasada com Probase Cold apresentou maior resistência de união (p<0,001) do que a resina Probase Hot rebasada com Ufi Gel Hard C.
Conclusão: O valor mais elevado de resistência adesiva a tensões de cisalhamento foi registado nas resinas de base de prótese Probase Hot rebasadas com a resina Probase Cold, em contraste com as resinas de base de prótese Probase Hot rebasadas com Ufi Gel Hard C. No entanto as duas resinas acrílicas de rebasamento apresentaram uma resistência de união semelhante uma vez unidas com as resinas impressas em 3D.
Objective: To evaluate the shear bond strength (SBS) of 3D-printed denture base acrylic resins to conventional reline acrylic resins, after thermal and chemical aging. Materials and Methods: Sixty specimens (10×10×3.3mm) of two 3D-printed denture base acrylic resins (V-Print Dentbase and Denture 3D+) and one conventionally produced denture base acrylic resin (Probase Hot - control), were relined with two reline acrylic resins: Ufi Gel Hard C- used in chairside relining, and Probase Cold, used in laboratory (n=10). The relined specimens were submitted to 1000 cycles of thermal fluctuations (5 and 55ºC) and immersed alternately in artificial saliva at pH=3 (8h/day) and pH=7 (16h/day) for 28 days. SBS was tested with an universal testing machine (Instron Model 4502) at the speed of 1mm/min. The mode of failure was evaluated using a stereomicroscope. Data were statistically analyzed (Kruskal-Wallis test, t-tests) with a statistical significance at 5%. Results: SBS values ranged from 9.8 2.80 to 21.5 5.00 MPa. SBS was not affected by denture base acrylic used (p=0.07). However, for the printed base resins, no differences were found between bond strength values achieved with the two reline resins (p<0.07). In particular, Probase Hot relined with Probase Cold yielded an higher (p<0.001) bond strength than Probase Hot with Ufi Gel Hard C. Conclusions: Although Probase Hot obtained greater adhesive strength to Probase Cold than Ufi Gel Hard C, the two 3D-printed resins granted similar bond strength to the reline acrylic resins studied.
Objective: To evaluate the shear bond strength (SBS) of 3D-printed denture base acrylic resins to conventional reline acrylic resins, after thermal and chemical aging. Materials and Methods: Sixty specimens (10×10×3.3mm) of two 3D-printed denture base acrylic resins (V-Print Dentbase and Denture 3D+) and one conventionally produced denture base acrylic resin (Probase Hot - control), were relined with two reline acrylic resins: Ufi Gel Hard C- used in chairside relining, and Probase Cold, used in laboratory (n=10). The relined specimens were submitted to 1000 cycles of thermal fluctuations (5 and 55ºC) and immersed alternately in artificial saliva at pH=3 (8h/day) and pH=7 (16h/day) for 28 days. SBS was tested with an universal testing machine (Instron Model 4502) at the speed of 1mm/min. The mode of failure was evaluated using a stereomicroscope. Data were statistically analyzed (Kruskal-Wallis test, t-tests) with a statistical significance at 5%. Results: SBS values ranged from 9.8 2.80 to 21.5 5.00 MPa. SBS was not affected by denture base acrylic used (p=0.07). However, for the printed base resins, no differences were found between bond strength values achieved with the two reline resins (p<0.07). In particular, Probase Hot relined with Probase Cold yielded an higher (p<0.001) bond strength than Probase Hot with Ufi Gel Hard C. Conclusions: Although Probase Hot obtained greater adhesive strength to Probase Cold than Ufi Gel Hard C, the two 3D-printed resins granted similar bond strength to the reline acrylic resins studied.
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Teses de mestrado - 2022 Saúde Oral