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Master's Dissertation
DOI
https://doi.org/10.11606/D.25.2017.tde-10112021-100214
Document
Author
Full name
Angélica Feltrin dos Santos
Institute/School/College
Knowledge Area
Date of Defense
Published
Bauru, 2017
Supervisor
Committee
Furuse, Adilson Yoshio (President)
Borges, Ana Flávia Sanches
Gonzaga, Carla Castiglia
Lisboa Filho, Paulo Noronha
Title in English
Influence of the incorporation of TiO2 nanotubes in a polycrystalline zirconia: synthesis of nanotubes, surface characterization and bond strength
Keywords in English
Shear bond strength
TiO2 nanotubes
Y-TZP
Abstract in English
Despite numerous advantages such as high strength, cementing zirconia is still critical. In the present study TiO2 nanotubes were synthesized and applied over zirconia surface. This surface was characterized and after that the bond strength test was conducted to a resin cement. TiO2 nanotubes were produced by alkaline synthesis, mixed with isopropyl alcohol (50 wt%) and applied on pre-sintered zirconia slices (IPS e.max ZirCAD). The ceramics were sintered and surfaces were characterized by confocal laser microscopy, scanning electron microscopy (SEM) and EDS analysis. For the bond strength, six groups (n = 16) were evaluated: 1) without application of TiO2 and Single Bond Universal; 2) with the application of TiO2 nanotubes and Single Bond Universal; 3) without application of TiO2 nanotubes and Z-prime; 4) with application of TiO2 nanotubes and Z-prime; 5) without application of TiO2 and Signum Zirconia Bond; 6) with application of TiO2 and Signum Zirconia Bond. After sintering, resin cement (RelyX Ultimate) cylinders with diameter of 1.40 mm and 1 mm in height were prepared and light cured for 40 s. The specimens were stored for 30 days in distilled water at 37°C and submitted to shear test. The nanotubes were incorporated in the zirconia surface and the EDS analysis has confirmed that the nanoagglomerates were composed of TiO2. The shear bond strength showed there was significant statistical difference among the analyzed groups. There was no significant statistical difference with the application of the nanotubes regardless of the analyzed group. It may be concluded that it was possible to incorporate nanotubes to the zirconia surfaces, however this incorporation did not improve the bond strength.
Title in Portuguese
Influência da incorporação de nanotubos de TiO2 a uma zircônia policristalina: síntese de nanotubos, caracterização superficial e resistência de união
Keywords in Portuguese
Microcisalhamento
Nanotubos de TiO2
Y-TZP
Abstract in Portuguese
Apesar de inúmeras vantagens, tal como alta resistência, a cimentação da zircônia ainda é crítica. No presente estudo nanotubos de TiO2 foram sintetizados e aplicados sobre a superfície da zircônia, essa superfície foi caracterizada e posteriormete foi conduzido o teste de resistência de união a um cimento resinoso. Os nanotubos de TiO2 foram produzidos por síntese alcalina, misturados com álcool isopropílico (50% em peso) e aplicados em fatias de zircônia pré-sinterizados (IPS e.max ZirCAD). As cerâmicas foram sinterizadas e as superfícies foram caracterizadas por microscopia confocal a laser, microscopia eletrônica de varredura (SEM) e análise de composição atômica por EDS. Para a resistência de união foram avaliados seis grupos (n = 16): 1) sem aplicação de nanotubos de TiO2 e Single Bond Universal; 2) com a aplicação de nanotubos de TiO2 e Single Bond Universal; 3) sem aplicação de nanotubos de TiO2 e Z-prime; 4) com aplicação de nanotubos de TiO2 e Z-prime; 5) sem aplicação de nanotubos de TiO2 e Signum Zirconia Bond ; 6) com aplicação de nanotubos de TiO2 e Signum Zirconia Bond. Após a sinterização, foram preparados cilindros de cimento resinoso (RelyX Ultimate) com um diâmetro de 1,40 mm e 1 mm de altura, fotopolimerizados por luz durante 40 s. Os espécimes foram armazenados durante 30 dias em água destilada a 37°C e submetidos a ensaio de microcisalhamento. Os nanotubos de TiO2 foram incorporados na superfície de zircônia e a análise EDS confirmou que os nanoaglomerados eram compostos de TiO2. O teste de microcisalhamento mostrou diferença estatística significativa entre os grupos analisados. Não houve diferença estatística significativa com a aplicação dos nanotubos, independentemente do grupo analisado. Pode-se concluir que foi possível incorporar nanotubos às superfícies de zircônia, porém esta incorporação não melhorou a resistência de união.
 
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Publishing Date
2021-11-10
 
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