<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1646-2890</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Port Estomatol Med Dent Cir Maxilofac]]></abbrev-journal-title>
<issn>1646-2890</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Estomatologia e Medicina Dentária]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1646-28902025000400191</article-id>
<article-id pub-id-type="doi">10.24873/j.rpemd.2025.12.1558</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of different cleansing agent solutions on denture acetal resin mechanical and physicochemical properties]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito de diferentes soluções de agentes de limpeza nas propriedades mecânicas e físico-químicas da resina acetal para próteses dentárias]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reeves]]></surname>
<given-names><![CDATA[Zuzanna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Szczescio-W&#322;odarczyk]]></surname>
<given-names><![CDATA[Agata]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kula]]></surname>
<given-names><![CDATA[Zofia Magdalena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Medical University of Lodz Department of Dental Technology ]]></institution>
<addr-line><![CDATA[Lodz ]]></addr-line>
<country>Poland</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Medical University of Lodz University Laboratory of Materials Research ]]></institution>
<addr-line><![CDATA[Lodz ]]></addr-line>
<country>Poland</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>66</volume>
<numero>4</numero>
<fpage>191</fpage>
<lpage>198</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-28902025000400191&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-28902025000400191&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-28902025000400191&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objectives:  To determine the impact of denture hygiene solutions on the physicochemical properties of acetal material used for dental prosthesis production.  Methods:  The study used T.S.M Acetal, immersed in denture hygiene solutions. The samples were divided into five groups: a control group, a group immersed in distilled water, and three groups immersed in a dental hygiene solution: Multiclean Roko powder for thermoplastics, Corega Tabs, and Protefix® Hygiene, respectively. After immersion, tests for hardness, impact strength, flexural strength, and sorption were conducted. Statistical analysis of the collected results was performed in Statistica 13.3. The normality of the distribution was checked using the Shapiro-Wilk test. When values were p&gt;0.05, considered as a normal distribution, a parametric analysis of variance ANOVA followed by a post-hoc test was performed.  Results:  After immersion of acetal in Corega Tabs and Protefix® Hygiene solutions, hardness significantly decreased. The unnotched impact strength test revealed an increase for all groups, whereas the notched impact strength decreased significantly, except for the Multiclean Roko solution group. Flexural strength after solution immersion did not differ significantly from the control group, except for the Corega Tabs group. The sorption study revealed a large decrease for the Corega Tabs (2,2 &#956;g/mm3) and Protefix® Hygiene groups.  Conclusions:  The Multiclean Roko cleaning agent for thermoplastic materials has the least impact on material hardness, so its use for the hygienization of acetyl-based restorations seems justified. The impact of other agents on thermoplastic material hardness might increase abrasive wear, which should be investigated in further studies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Objetivos:  Determinar o impacto de soluções de higiene de próteses dentárias nas propriedades físico-químicas do material acetal utilizado no fabrico de próteses dentárias.  Métodos:  O estudo utilizou o T.S.M Acetal, incubado em preparações para higiene de próteses dentárias. As amostras foram divididas em cinco grupos: um grupo controlo, um grupo incubado em água destilada e três grupos incubados em soluções para higiene de próteses dentárias: Multiclean Roko em pó dedicado a termoplásticos, Corega Tabs e Protefix® Hygiene, respetivamente. Após a incubação, foram realizados ensaios de dureza, resistência ao impacto, resistência à flexão e sorção.  Resultados:  Após a incubação do acetal nas preparações Corega Tabs e Protefix® Hygiene, a dureza diminuiu significativamente. O teste de resistência ao impacto sem entalhe revelou um aumento em todos os grupos, enquanto a resistência ao impacto com entalhe mostrou uma diminuição significativa, exceto no grupo de Corega Tabs. A resistência à flexão após a imersão não diferiu significativamente da do grupo controlo, exceto no grupo Corega Tabs. O estudo de sorção revelou uma grande diminuição nos grupos de Corega Tabs e Protefix Hygiene.  Conclusões:  O agente de limpeza para materiais termoplásticos Multiclean Roko tem o menor impacto na dureza do material, pelo que parece justificada a sua utilização na higienização de restaurações à base de acetilo. O impacto de outros agentes na dureza do material termoplástico poderá aumentar o desgaste abrasivo do material, o que deve ser investigado em estudos posteriores.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Acetal resin]]></kwd>
<kwd lng="en"><![CDATA[Dental prosthesis]]></kwd>
<kwd lng="en"><![CDATA[Dentures]]></kwd>
<kwd lng="en"><![CDATA[Oral hygiene]]></kwd>
<kwd lng="pt"><![CDATA[Resina acrílica]]></kwd>
<kwd lng="pt"><![CDATA[Prótese dentária]]></kwd>
<kwd lng="pt"><![CDATA[Próteses dentárias]]></kwd>
<kwd lng="pt"><![CDATA[Higiene oral]]></kwd>
</kwd-group>
</article-meta>
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