Evaluation of the Color Stability of Methyl Methacrylate and Nylon Base Polymer
Identifieur interne : 007041 ( Ncbi/Curation ); précédent : 007040; suivant : 007042Evaluation of the Color Stability of Methyl Methacrylate and Nylon Base Polymer
Auteurs : Fahimeh Hamedi Rad [Iran] ; Tahereh Ghaffari [Iran] ; Raana Tamgaji [Iran]Source :
- Journal of Dentistry [ 2345-6485 ] ; 2017.
Abstract
Evaluation of the color stability of materials used for the fabrication of the base of complete and partial removable dentures provides important information in relation to their clinical service. The color stability of nylon-based polymers as denture bases, compared to that of acrylic resins, has not been extensively evaluated since to date.
The aim of the present
Twenty samples were evaluated in the present
After 100 hours of irradiation with UV light and thermocycling, color changes were tangible in both materials. After 200 hours of irradiation with UV light and thermocycling, both materials exhibited a decrease in glaze. In general, chromatic changes in the acrylic resin were more noticeable.
Accelerated aging affected the color stability of the acrylic resin and nylon-based polymer,
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PubMed: 28620638
PubMed Central: 5457523
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<author><name sortKey="Hamedi Rad, Fahimeh" sort="Hamedi Rad, Fahimeh" uniqKey="Hamedi Rad F" first="Fahimeh" last="Hamedi Rad">Fahimeh Hamedi Rad</name>
<affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz, Iran.</nlm:aff>
<country xml:lang="fr" wicri:curation="lc">Iran</country>
<wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz</wicri:regionArea>
<wicri:noRegion>Tabriz</wicri:noRegion>
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<author><name sortKey="Ghaffari, Tahereh" sort="Ghaffari, Tahereh" uniqKey="Ghaffari T" first="Tahereh" last="Ghaffari">Tahereh Ghaffari</name>
<affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz, Iran.</nlm:aff>
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<author><name sortKey="Tamgaji, Raana" sort="Tamgaji, Raana" uniqKey="Tamgaji R" first="Raana" last="Tamgaji">Raana Tamgaji</name>
<affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Oral Medicine, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz, Iran.</nlm:aff>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Evaluation of the Color Stability of Methyl Methacrylate and Nylon Base Polymer
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<author><name sortKey="Hamedi Rad, Fahimeh" sort="Hamedi Rad, Fahimeh" uniqKey="Hamedi Rad F" first="Fahimeh" last="Hamedi Rad">Fahimeh Hamedi Rad</name>
<affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz, Iran.</nlm:aff>
<country xml:lang="fr" wicri:curation="lc">Iran</country>
<wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz</wicri:regionArea>
<wicri:noRegion>Tabriz</wicri:noRegion>
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<author><name sortKey="Ghaffari, Tahereh" sort="Ghaffari, Tahereh" uniqKey="Ghaffari T" first="Tahereh" last="Ghaffari">Tahereh Ghaffari</name>
<affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz, Iran.</nlm:aff>
<country xml:lang="fr" wicri:curation="lc">Iran</country>
<wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz</wicri:regionArea>
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<author><name sortKey="Tamgaji, Raana" sort="Tamgaji, Raana" uniqKey="Tamgaji R" first="Raana" last="Tamgaji">Raana Tamgaji</name>
<affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Oral Medicine, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz, Iran.</nlm:aff>
<country xml:lang="fr" wicri:curation="lc">Iran</country>
<wicri:regionArea>Postgraduate Student of Oral Medicine, School of Dentistry, Tabriz, University of Medical Sciences, Tabriz</wicri:regionArea>
<wicri:noRegion>Tabriz</wicri:noRegion>
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<series><title level="j">Journal of Dentistry</title>
<idno type="ISSN">2345-6485</idno>
<idno type="eISSN">2345-6418</idno>
<imprint><date when="2017">2017</date>
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<front><div type="abstract" xml:lang="en"><sec id="st1"><title>Statement of the Problem:</title>
<p>Evaluation of the color stability of materials used for the fabrication of the base of complete and partial removable dentures provides important information in relation to their clinical service.
The color stability of nylon-based polymers as denture bases, compared to that of acrylic resins, has not been extensively evaluated since to date.
</p>
</sec>
<sec id="st2"><title>Purpose: </title>
<p>The aim of the present <italic>in vitro</italic>
study was to evaluate the color stability of conventional polymethyl methacrylate and nylon-based polymer materials used for the fabrication of the base of complete and partial removable dentures.
</p>
</sec>
<sec id="st3"><title>Materials and Method: </title>
<p>Twenty samples were evaluated in the present <italic>in vitro</italic>
study. One nylon-based polymer and one heat-cured acrylic resin were
seleted for the purpose of the study. Ten disk samples, measuring 10 mm in diameter and 2 mm in thickness, were prepared from each material
according to the manufacturers’ instructions. The samples were evaluted with the CIELAB sysem using spectrophtometery at baseline and after
irradiation with UV light for 100 and 200 hours and thermocycling. One-way ANOVA and post hoc paired t-test were used to compare the color stability of the two groups. Statistical significance was set at <italic>p</italic>
< 0.05.
</p>
</sec>
<sec id="st4"><title>Results:</title>
<p>After 100 hours of irradiation with UV light and thermocycling, color changes were tangible in both materials. After 200 hours of irradiation
with UV light and thermocycling, both materials exhibited a decrease in glaze. In general, chromatic changes in the acrylic resin were more noticeable.
</p>
</sec>
<sec id="st5"><title>Conclusion:</title>
<p>Accelerated aging affected the color stability of the acrylic resin and nylon-based polymer, <italic>p</italic>
< 0.05 for Δa200 and Δb200 and ΔL100; however,
at the end of the study both materials exhibited clinically acceptable color stability (ΔE<3.7).
</p>
</sec>
</div>
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