Color stability of glass-fiber-reinforced polypropylene for non-metal clasp dentures

Nagakura, Manamu; Tanimoto, Yasuhiro; Nishiyama, Norihiro

doi:10.1016/j.jpor.2017.05.007

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…To determine the relationship between the amount of color alteration recorded on a spectrophotometer to the clinical environment, data was converted to the National Bureau of Standards (NBS) system units as follows:

(See [ 20 ].) The defined critical remarks of color change according to the quantified NBS units are given in Table 2 [ 15 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Fibers on Color and Translucency Changes of Bulk-Fill and Anterior Composites after Accelerated Aging

Tunçdemir

Güven

2018

BioMed Research International

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The aim of this study was to determine the effects of glass and polyethylene fibers on the color and translucency change of bulk-fill and anterior composites before and after artificial accelerated aging (AAA). Two types of teflon molds were used to fabricate samples which were 13 mm in diameter and, respectively, 2 mm and 4 mm in height. Polyethylene fiber (PF) and glass fiber (GF) were incorporated in the middle of the composite samples. Color and translucency changes of each composite were evaluated before and after AAA with spectrophotometer. ANOVA and Tukey's HSD post hoc statistical analysis were used at a significance level of 0.05. Before AAA (for anterior composites), there were no significant differences in L* and b* parameters among the three groups (p > 0.05); there were no significant differences in L* parameter between PF and GF groups or in TP between GF and control groups (p > 0.05) (for bulk-fill composites). After AAA, there were no significant differences in L* parameter between GF and control groups, in a* parameter between PF and control groups, in b* parameter among all groups, or in TP parameter between GF and control groups (p > 0.05). Fiber reinforcement led to color and TP change in both anterior and bulk-fill resin composites.

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(See [ 20 ].) The defined critical remarks of color change according to the quantified NBS units are given in Table 2 [ 15 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Fibers on Color and Translucency Changes of Bulk-Fill and Anterior Composites after Accelerated Aging

Tunçdemir

Güven

2018

BioMed Research International

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“…GFRTPs composed of E-glass fibers, a polypropylene matrix, and a small amount of coloring pigment were produced by injection-molding pellets (Plastron, PP-GF50-02, Daicel Polymer, Tokyo, Japan) consisting of polypropylene reinforced with E-glass fibers of diameter 17 µm and length 10 mm, and 2 mass% of pigment (Aesthetic Intensive-Colors: Purpur Red, Candulor, Glattpark, Switzerland); this process is described in detail elsewhere 2,5) . According to a previous study on the optimum fiber contents of GFRTPs, GFRTPs were prepared with fiber contents of 0 mass% (GF0), 10 mass% (GF10), and 20 mass% (GF20).…”

Section: Preparation Of Gfrtpsmentioning

confidence: 99%

“…A novel NMCD made from the GFRTPs designed in a previous study is esthetically pleasing and has sufficient rigidity, and its properties can be controlled based on the fiber loading and pigmentation 4) . Furthermore, the GFRTPs have clinically acceptable color stability and might be satisfactory for clinical use 5) .…”

Section: Introductionmentioning

confidence: 99%

Effects of polishing on surface roughness and hardness of glass-fiber-reinforced polypropylene

Tanimoto

Nagakura

2018

Dental Materials Journal

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Removable partial dentures (RPDs) with resin-clasp retentive parts, which are known as non-metal-clasp dentures (NMCDs), have been used as alternatives for conventional RPDs with metal clasp, in case of aesthetic prosthodontic treatments. In this study, a profilometer and dynamic micro-indentation tests were used to investigate the effects of polishing on the surface properties such as surface roughness (Ra), dynamic hardness, and elastic modulus of high-rigidity glass-fiber-reinforced thermoplastics (GFRTPs) composed of E-glass fibers and polypropylene for NMCDs. The Ra values of the GFRTPs after polishing were significantly lower than those before polishing. The values were close to the Ra threshold level of 0.2, which corresponds to an acceptable surface smoothness for denture base materials. Polishing did not significantly change the dynamic hardnesses and elastic moduli of the GFRTPs. The fiber loading did not greatly affect the micromechanical properties of the GFRTPs because the glass-fiber reinforcement is embedded in the polypropylene matrix.

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“…When specimens stored in distilled water at 7 days were compared with baseline data, the finding showed that there were slight changes in colour values between the groups containing zirconia and the control group (without ZrO 2 ) ( Table 4). As the concentration of ZrO 2 increased, the colour change increased, however, these changes were clinically acceptable according to NBS [20,21]. Therefore, the combined effect of the cleaning solutions and concentration of ZrO 2 nanoparticles could be accounted for the colour change in the nanocomposite specimens.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cleansers on the Colour Stability of Zirconia Impregnated PMMA Bio-Nanocomposite

et al. 2020

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Exposure of denture base acrylic resins to the oral environment and storage media for extended periods of time results in colour change due to changes in the properties of the material. The purpose of this in vitro study was to assess the colour stability of high-impact heat-polymerized denture base acrylic resin (HI PMMA) impregnated with zirconia nanoparticles after storage in distilled water (DW) and denture cleaners such as Steradent (STD) and Milton (MIL) for 180 days. Ninety specimens of PMMA + Zirconia nanocomposite with varying nanoparticle concentrations (1.5 wt.%, 3.0 wt.%, 5.0 wt.%, 7.0 wt.% and 10 wt.%) were prepared with a diameter and thickness of 25 ± 1.0 mm × 2 ± 0.1 mm and divided into six groups, while each group was further divided into three subgroups: storage in DW (control), STD and MIL. Colour changes were measured with a Minolta Chroma Meter (Minolta, Osaka, Japan), and assessed using the CIE L*a*b* colorimetric system. Data were statistically analysed for colour change with Friedman’s Two-way and Kruskal-Wallis tests at a pre-set alpha value level of 0.05. The colour change (ΔΕ) exhibiting significant differences were found among all groups immersed in denture cleaners, and all values increased with time. According to the National Bureau of Standards, the control group displayed the lowest colour change value (ΔΕ = 1.22), and the highest value was for 10 wt.% ZrO2 while stored in MIL (ΔΕ = 6.07). The values of colour change for storage in water ranged from 0.49 (control) to 1.82 (10 wt.% ZrO2). The colour change value for the composite group containing 3 wt.% zirconia was clinically acceptable. However, high concentrations of denture cleaners should be avoided, and the shortest cleaning time is recommended to improve the clinical life of the nanocomposite denture base.

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Color stability of glass-fiber-reinforced polypropylene for non-metal clasp dentures

Abstract: The results indicate that the GFRTPs showed clinically acceptable color stability and might be satisfactory for clinical use. Therefore, GFRTPs are expected to become attractive materials for esthetic dentures.

Cited by 12 publications

References 19 publications

Effects of Fibers on Color and Translucency Changes of Bulk-Fill and Anterior Composites after Accelerated Aging

Effects of Fibers on Color and Translucency Changes of Bulk-Fill and Anterior Composites after Accelerated Aging

Effects of polishing on surface roughness and hardness of glass-fiber-reinforced polypropylene

Effect of Cleansers on the Colour Stability of Zirconia Impregnated PMMA Bio-Nanocomposite

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