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| Author(s): |
Marcela Borghi Paulini
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Araçatuba. 2018-10-22. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba |
| Defense date: | 2018-08-28 |
| Advisor: | Marcelo Coelho Goiato; Daniela Micheline dos Santos |
| Abstract | |
Abstract : Statement of problem : The manufacturing materials of maxillofacial prostheses are in constant need of improvements due its poor longevity. Aim: Evaluate the chromatic stability, surface roughness and sorption and solubility of two silicones, MDX4 - 4210 and A - 120 with two intrinsic pigments and the application of a nonthermal plasma (NTP) . Methods: One - hundred and sixty specimens were fabricated and distributed in to 16 groups (n=10) according to the silicone, pigment and plasma coat. The NTP was applied with a mixture of 70% hexamethyldisiloxane, 20% O, and 10% Ar. The chromatic stability, surface roughness (Ra) and sorption and solubility were evaluated. Results : A - 120 presented better chromatic stability results , which we re influenced by the NTP ( P <0,001) ; group A - 120 with bronze pigment ( Δ E=1,13) and A - 120 with orbipasta pigment ( Δ E=1,01) were the best results . Surface roughness presented a difference for period and group ( P <0,001) with Ra ranging from 0,14nm to 0,39 nm ; the least rough result was from A - 120 with NTPS. Sorption and solubil ity were different for the pigments, the bronze pigment groups presented the smallest results after NT P treatment ( P <0,001). Conclusion: NTP is a viable option to improve physical properties of maxillofacial silicones. (AU) | |
| FAPESP's process: | 16/11729-0 - Analysis of different physical and optical properties of facial silicones with different pigments, subjected to treatment with low temperature plasma and accelerated aging |
| Grantee: | Marcela Borghi Paulini |
| Support Opportunities: | Scholarships in Brazil - Master |