Avaliação das propriedades superficiais de um material reembasador resiliente para prótese total

Abstract

Totally edentulous patients can be rehabilitated by means of full dentures, in which the success of this treatment includes not only restoration of immediate function and esthetics, but also maintenance of the prosthesis in perfect quality for as long as possible. When the full denture becomes maladaptative, denture liners and methods may be used to adjust its base to the supporting tissues. A variety of lining materials exist and depending on the composition of the material, it may exhibit greater or lesser resistance to surface wear. Hence, the aim of the present study was to evaluate the physical stability of a soft denture lining material for full denture (Soft Rebase – TDV) after brushing cycles with different cleaning agents and disinfection protocols, analyzing their surface roughness, color and wettability over time. To that end, eighteen acrylic resin matrices containing four circular orifices (5 mm diameter × 1.5 mm thickness) were used to serve as a retention substrate for the lining material. Each specimen was submitted to daily manual brushing cycles with different cleaning agents (neutral soap, Curaprox cream and Trihydral cream) followed or not by immersion in 0.5% sodium hypochlorite solution (NaOCl) for 10 min daily. For the color analysis a digital spectrophotometer (Vita Easyshade) was used; for roughness analysis, a portable profilometer; and, to evaluate the wettability of each specimen, it was carried out by the water contact angle test (θ). The data were analyzed statistically with ANOVA and the SNK test (α = 5%). The specimens immersed in NaOCl solution and cleaned with Curaprox cream or neutral soap presented greater color alteration when compared to the specimens cleaned with Trihydral cream. On the other hand, specimens that were not immersed in NaOCl showed similar final color changes among each other (p> 0.05). All specimens acquired rougher surfaces after the brushing/disinfection cycles, except the group brushed with Trihydral cream without NaOCl immersion. The denture lining material had its wettability increased in all groups, being this pattern more intense for the group brushed with neutral soap and not immersed in NaOCl. In conclusion, the protocol that combined the brushing with Trihydral cream and daily disinfection for 10 minutes in sodium hypochlorite solution seems to be the most suitable for cleaning relined dentures, since this protocol resulted in less negative effects on the properties of the lining material.