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首页> 外文期刊>The Journal of Prosthetic Dentistry >Color stability of nonpigmented and pigmented maxillofacial silicone elastomer exposed to 3 different environments
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Color stability of nonpigmented and pigmented maxillofacial silicone elastomer exposed to 3 different environments

机译：非染色和着色的颌面硅氧烷弹性体的颜色稳定性暴露于3种不同的环境

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摘要

Statement of problemThe color degradation of maxillofacial prostheses in clinical service requires their frequent renewal. How different materials compare is unclear. PurposeThe purpose of this in?vitro study was to investigate the color stability of a nonpigmented and pigmented maxillofacial silicone when stored in darkness and exposed to accelerated aging in a weathering chamber and natural outdoor weathering. Material and methodsM511 elastomer was colored with Spectromatch Pro colorants, stored in darkness, and exposed to accelerated aging and natural outdoor weathering for 1500 hours. Test groups included nonpigmented specimens (n=18), individually pigmented specimens (n=90), and Caucasian skin tone-colored specimens (n=18). The CIELab values of the test specimens were measured using the CM-2600d spectrophotometer (Konica Minolta Sensing) at base line (0?hours) and then every 100 hours up to 1500 hours of aging. Color changes (ΔE) were calculated based on the recorded CIELab values. All data were analyzed by using linear mixed models and the ?ídák multiple comparison of means test (α=.05). ResultsA significant effect of time was found on the ΔE of all test specimens in all environments (P=.001). All pigmented M511 specimens demonstrated good color stability with maximum ΔE below the acceptability threshold of 2 ΔE when stored in darkness and exposed to outdoor weathering. However, nonpigmented specimens crossed this acceptability threshold when exposed to outdoor weathering with maximum ΔE values of 3.65. The greatest color changes were observed for all specimens when exposed to accelerated aging and most exceeded the acceptability threshold. Nonpigmented (ΔE, 4.86) and Indian yellow (ΔE, 5.20) demonstrated the highest color changes after 1500 hours. ConclusionsAll environments resulted in visible color changes of nonpigmented and pigmented M511 elastomer. The lowest ΔE values were observed for specimens stored in darkness and the greatest for specimens exposed to accelerated aging. The organic pigment Logwood maroon demonstrated the best color stability with maximum ΔE values below the perceptibility threshold (PT) of 1 ΔE.
机译：问题陈述临床服务中颌面假体的颜色降解需要他们频繁的更新。如何不同的材料比较尚不清楚。目的的目的是在体外研究中，在储存在暗度下储存并暴露于耐候室和自然户外风化时，探讨非染色和着色的颌面硅氧烷的颜色稳定性。材料和方法2111弹性体用Spectromatch Pro着色剂着色，储存在黑暗中，并暴露于加速老化和自然户外风化1500小时。试验组包括非染色试样（n = 18），单独色素的样品（n = 90）和白种人皮肤色调 - 彩色标本（n = 18）。使用CM-2600D分光光度计（konica minolta感测）在基线（0≤mal）测量试样的CIELAB值，然后每100小时衰老均高达1500小时。基于记录的CIELAB值计算颜色变化（ΔE）。通过使用线性混合模型来分析所有数据，然后进行分析的方法测试（α= .05）。结果在所有环境中所有测试标本的ΔE中发现了时间的显着效果（P = .001）。所有颜料的M511样本都显示出良好的色彩稳定性，当储存在黑暗中并暴露在户外风化时，最大ΔE在2ΔE的可接受性阈值下方。然而，当暴露于户外风化时，不珍化的标本通过3.65的最大ΔE值越过这种可接受性阈值。当暴露于加速老化时，所有标本都观察到最大的颜色变化，并且大多数超过可接受性阈值。非趋化（ΔE，4.86）和印度黄色（ΔE，5.20）在1500小时后显示出最高的颜色变化。结论所有环境导致非染色和着色M511弹性体的可见颜色变化。观察到储存在黑暗中的样品的最低ΔE值，并且对暴露于加速衰老的标本最大的标本。有机颜料Logwood栗色栗色展示了最佳颜色稳定性，最大​​ΔE值低于1ΔE的可感知阈值（Pt）。

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    Ariane Farah; Martyn Sherriff; Trevor Coward;

  • 作者单位

    Academic Centre for Reconstructive Science King’s College London Guy’s Hospital;

    School of Oral and Dental Sciences University of Bristol;

    Reader/Consultant Academic Centre for Reconstructive Science King’s College London Guy’s Hospital;

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  • 正文语种 eng
  • 中图分类 口腔科学;
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