Effect of different solutions on color stability of acrylic resin-based dentures

Goiato, Marcelo Coelho; Nóbrega, Adhara Smith; Santos, Daniela Micheline dos; Andreotti, Agda Marobo; Moreno, Amália

doi:10.1590/s1806-83242013005000033

Cited by 30 publications

(41 citation statements)

References 25 publications

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“…20,26,27 In addition, in the literature, it is also possible to find some authors who report a ΔE <3.7 for a clinically acceptable color change of a material. 5,[21][22][23] In the present study, the color alteration in each group was lower than 3.3 (►Table 1). Therefore, both groups showed clinically acceptable values.…”

Section: Discussioncontrasting

confidence: 43%

“…This system can be calculated according to the formula: ΔE = [(ΔL) 2 + (Δa) 2 + (Δb) 2 ] ½ . [5][6][7]14,15,17,[19][20][21][22][23] The "L" represents brightness from 0 (black) to 100 (perfect white), the "a" represents the amount of red (positive values) or green (negative values), and the "b" represents the amount of yellow (positive values) or blue (negative values). 5,7,17,21,23 Color readings were taken before and after accelerated aging.…”

Section: Color Stability and Shore A Hardness Testsmentioning

confidence: 99%

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Analysis of Color and Hardness of a Medical Silicone with Extrinsic Pigmentation after Accelerated Aging

et al. 2020

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Objective The aim of this study is to evaluate the color alteration and shore A hardness of a medical silicone with extrinsic pigmentation, before and after accelerated aging. Materials and Methods Twenty samples (Silastic Q7–4735) were made with an intrinsic pigmentation. This intrinsic pigmentation was composed of a pink pigment (H-109-P, Factor II) and an opacifier (ZnO). All samples had standardized dimensions (45-mm diameter and 2-mm thickness). Half of the 20 samples manufactured subsequently received an extrinsic pigment (Tan FE–215, Factor II). Therefore, two groups were created (n = 10): Group 1, group with intrinsic pigmentation and without extrinsic pigmentation (control) and Group 2, group with intrinsic and extrinsic pigmentation. Samples were submitted to color and Shore A hardness tests, before and after 1,008 hours of aging. Statistical Analysis Color alteration data were submitted to Student’s t-test (α = 0.05). Shore A hardness data were submitted to two-way analysis of variance and Tukey test (α = 0.05). Results The incorporation of the extrinsic pigment on the silicone did not affect its color (ΔE) when the two groups were compared (p = 0.232). Regarding the hardness test, the interaction between group and period did not interfere with the hardness results(p=0.599). However, the period factor showed that there was a reduction in the hardness of the silicone after aging (p < 0.05). Conclusion In this study, all the hardness and color results of the silicone used were clinically acceptable, regardless of the presence of extrinsic pigmentation.

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Section: Discussioncontrasting

confidence: 43%

Section: Color Stability and Shore A Hardness Testsmentioning

confidence: 99%

Analysis of Color and Hardness of a Medical Silicone with Extrinsic Pigmentation after Accelerated Aging

et al. 2020

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“…but colour and colour stability is one of the major issues in anterior restorations. The colour stability of the restorations can be affected by several factors like surface roughness, absorption of fluids, accumulation of stains, dissolution, erosion by beverages, and degradation of the material (Goiato et al, 2013;Moon, Powers and Kiat-amnuay, 2014) Colour assessment can be done either by visual examination using shade guides or by using spectrophotometry. This visual examination is subjective to physiological and psychological factors based on the surrounding light.…”

Section: Discussionmentioning

confidence: 99%

“…There are various interim restorative materials available. Polymethyl methacrylate (PMMA) is one of the most commonly used denture base material(sepúlveda-navarro et al, 2011) (Goiato et al, 2013).The types of PMMA resin includes heat-cured resin, auto-polymerizing acrylic resin, light-cured resin, microwave processing resin, computer-aided design/computer-aided manufacturing (CAD/CAM) PMMA block resin (Tuna et al, 2013;Choi et al, 2018). The most commonly used PMMA resins are heat cured and CAD-CAM resin.…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Colour Stability Among Cad Cam and Resin Interim Restoration- an in Vitro Study

Hinaz¹

2020

Biosci. Biotech. Res. Comm

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The provisional restorations are used for an interim period in fixed prosthodontics. In a few situations, it can also be used as a long term provisional restoration. In the case of long term provisional restorations, the major concern is the aesthetics and function. In anterior tooth replacement, colour stability is the main criteria for selection of material. Colour stability can be affected by various reasons. The aim of the study is to evaluate the colour stability on CAD-CAM interim restoration and the conventional interim restoration. Eight samples each of heat cure provisional and CAD-CAM resin milled provisional are fabricated and tested in a toothbrush simulator for a period of 24hrs. The average period of abrasion is for 9 months. Pre-test and post-test measurement of its absorbance using spectrophotometer done. The results showed that CAD-CAM provisional restorations have better colour stability than conventional heat-cured provisional restorations even after 9 months. This can be due to less monomer residue, better mechanical properties. Colour stability is an important criterion when anterior restoration is concerned. Discolouration of the restoration can be due to various factors that may lead to patient dissatisfaction. The CAD-CAM provisional restorations can be a better choice as a long term provisional restoration in the aesthetic zone.

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“…Different studies also reported color change of acrylic resin when submitted to different cleansing solutions. [26,27] Both disinfection methods were performed at an elevated temperature, which could induce an additional monomer release that could interact with the glaze coat, thus, increasing the chromatic alteration [ Table 2]. The period of use can alter or remove this external coating, [28] but it is believed that the glaze underwent a chemical reaction from the increased temperature or disinfection methods.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a glaze polishing technique for pigmented denture acrylic resin submitted to thermocycling and disinfection

et al. 2017

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IntroductIon Acrylic resin is the most commonly used material to manufacture conventional removable prostheses; it is a low-cost material, has good adaptability to oral tissue, it is easy to manipulate, and possesses satisfactory esthetic characteristics. [1-3] The acrylic resin must mimic the soft tissue features to provide an excellent esthetic outcome, [4] and there are two techniques to do so: An extrinsic characterization in which the pigments are added after the polymerization process; and an intrinsic characterization in which the pigments are incorporated into the acrylic before the polymerization. The intrinsic technique provides good results since pigmentation is internal. The pigments age with the prosthetic material and are not influenced by damage on the prosthesis surface. [2] Some physical properties are directly linked to material longevity, such as microhardness, surface roughness, and color stability. These properties can be influenced through time due to constant temperature changes, contact to wet oral tissues, the disinfection process used, and contact to different solutions. [1,5-13] Different polishing techniques have been used in an attempt to improve these characteristics; the polish can be mechanical, performed with different polishing pastes and soft brushes, or 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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Effect of different solutions on color stability of acrylic resin-based dentures

Cited by 30 publications

References 25 publications

Analysis of Color and Hardness of a Medical Silicone with Extrinsic Pigmentation after Accelerated Aging

Analysis of Color and Hardness of a Medical Silicone with Extrinsic Pigmentation after Accelerated Aging

Comparative Evaluation of Colour Stability Among Cad Cam and Resin Interim Restoration- an in Vitro Study

Evaluation of a glaze polishing technique for pigmented denture acrylic resin submitted to thermocycling and disinfection

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