| ORIGINAL RESEARCH |
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| Year : 2017 | Volume
: 9
| Issue : 5 | Page : 213-221 |
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Evaluation of a glaze polishing technique for pigmented denture acrylic resin submitted to thermocycling and disinfection
Marcelo Coelho Goiato1, Mariana Vilela Sônego1, Denise de Barros Carneiro1, Emily Vivianni Freitas da Silva1, Liliane da Rocha Bonatto2, Elidiane Cipriano Rangel3, Daniela Micheline dos Santos1
1 Department of Dental Materials and Prosthodontics, Aracatuba Dental School, Unesp Univ Estadual Paulista, Aracatuba, São Paulo, Brazil
2 Private Practice, Cascavel, Parana, Brazil
3 Department of Techonological Plasmas, Univ Estadual Paulista, Sorocaba, Brazil
Correspondence Address:
Marcelo Coelho Goiato
Department of Dental Materials and Prosthodontics, Unesp Univ Estadual Paulista, Aracatuba, Sao Paulo
Brazil
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/jioh.jioh_171_17
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Aims: Compare the mechanical and physical properties of two polishing techniques for acrylic resins under the influence of disinfection. Materials and Methods: Two hundred and eight circular samples (10 mm diameter × 3 mm height) were manufactured, with 160 for the color stability, hardness, surface roughness, and wettability (n = 10) analyses, and 48 for the scanning electron microscopy and atomic force microscopy evaluation (n = 1). Two brands of prosthesis acrylic resin, Onda Cryl and Lucitone, were used to manufacture the samples. Half of the samples were intrinsically pigmented with a purple acrylic pigment (Policor) at 7% of the total weight in powder; half of those received the mechanical polish with sand paper under constant water irrigation in a universal polishing machine at 300 rpm (control), and half received a uniform coat of a photopolymerized glaze (Megaseal) to be tested. The samples were kept immersed in distilled water for 24 h before the initial measurements (T0), afterward, they were divided into two disinfection procedures; half were disinfected through microwave energy and half through cleaning tablets (Efferdent) for 60 days (T1). Results: The glaze polished groups presented inferior chromatic stability and the pigments prevented discoloration for the glaze polish. The disinfectant solutions promoted a superficial degradation of the acrylic resin for both polishing techniques. Lucitone presented higher hardness values than Onda Cryl (P < 0.001) and the glaze technique had higher hardness values than the mechanic polish. Conclusion: The photopolymerized glaze improved some characteristics of the acrylic resin, such as the surface hardness and roughness suggesting it is an adequate polish for acrylic resins.
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