EFFECT OF INTRINSIC NANOPARTICLE PIGMENTATION ON THE COLOR STABILITY OF DENTURE BASE ACRYLIC RESINS

Author(s)

Goiato, Marcelo Coelho ^[1] ; Rossatti Zuccolotti, Bruna Carolina ^[1] ; dos Santos, Daniela Micheline ^[1] ; Coelho Sinhoreti, Mario Alexandre ^[2] ; Moreno, Amalia ^[1]

Affiliation

^[1] Sao Paulo State Univ, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, BR-16015050 Aracatuba, SP - Brazil

^[2] Univ Estadual Campinas, Piracicaba Dent Sch, Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF PROSTHETIC DENTISTRY; v. 110, n. 2, p. 101-106, AUG 2013.
• Web of Science Citations: 6

Abstract

Statement of problem. Intrinsic pigmentation is widely used to improve the esthetic features of denture base acrylic resins. However, acrylic resin may discolor over time. Purpose. The purpose of this study was to investigate the effect of intrinsic nanoparticle pigmentation on the color stability of acrylic resins. Material and methods. The acrylic resins, Onda Cryl, QC 20, Classico, and Lucitone, were evaluated. Twenty-one disk-shaped specimens (3 x 30 mm) were fabricated from each acrylic resin. Seven were colored with 3% Poli-Cor intrinsic pigment used to color denture base, 7 were colored with 7% pigment, and 7 were not pigmented. In addition, 7 specimens were fabricated containing only pigment. The specimens were thermally cycled 2000 times between 5 degrees C and 55 degrees C with a 30-second dwell time at each temperature. The specimen colors were measured with a spectrophotometer and evaluated with the CIE L{*}a{*}b{*} system before (B) and after thermal cycling (T). The pigment morphology was analyzed by using a scanning electron microscope (SEM) and energy-dispersive x-ray spectroscopy (EDS) techniques. The results were analyzed with 2-way nested ANOVA and Tukey HSD tests (alpha=.05). Results. Classico acrylic resin with and without pigment underwent the least color change, followed in order by Lucitone, Onda Cryl, and QC-20. The presence of pigments reduced the color change of the acrylic resins significantly (P<.05) for the specimens containing 7% pigment (0.32 +/- 0.18 Delta E). Titanium was the sole metallic component present in the pigment, probably in the oxide form (TiO2). Conclusions. Nanoparticle pigments enhanced the color stability of denture base acrylic resins. (J Prosthet Dent 2013;110:101-106) (AU)

• FAPESP's process: 09/15170-3 - Influence of thermocycling on hardness on the color and stability of pigmented acrylic resins to denture complete
• Grantee: Bruna Carolina Rossatti Zuccolotti
• Support Opportunities: Scholarships in Brazil - Scientific Initiation