Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners
Statement of Problem. Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging. Purpose. This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners t...
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| Veröffentlicht in: | The Journal of prosthetic dentistry 2002-11, Vol.88 (5), p.516-521 |
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| container_title | The Journal of prosthetic dentistry |
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| creator | Pinto, José Renato Ribeiro Mesquita, Marcelo Ferraz Henriques, Guilherme Elias Pessanha de Arruda Nóbilo, Mauro Antôonio |
| description | Statement of Problem. Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging. Purpose. This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners to acrylic resin bases. Material and Methods. Four soft lining materials (Molloplast-B, Flexor, Permasoft, and Pro Tech) and 2 acrylic resins (Classico and Lucitone 199) were processed for testing according to manufacturers' instructions. Twenty rectangular specimens (10 × 10-mm2 cross-sectional area) and twenty cylinder specimens (12.7-mm diameter × 19.0-mm height) for each liner/resin combination were used for the tensile and deformation tests, respectively. Specimen shape and liner thickness were standardized. Samples were divided into a test group that was thermocycled 3000 times and a control group that was stored for 24 hours in water at 37°C. Mean bond strength, expressed in megapascals (MPa), was determined in the tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. Elasticity, expressed as percent of permanent deformation, was calculated with an instrument for measuring permanent deformation described in ADA/ANSI specification 18. Data from both tests were examined with 1-way analysis of variance and a Tukey test, with calculation of a Scheffé interval at a 95% confidence level. Results. In the tensile test under control conditions, Molloplast-B (1.51 ± 0.28 MPa [mean ± SD]) and Pro Tech (1.44 ± 0.27 MPa) liners had higher bond strength values than the others (P |
| doi_str_mv | 10.1067/mpr.2002.128953 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_72772993</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0022391302002615</els_id><sourcerecordid>72772993</sourcerecordid><originalsourceid>FETCH-LOGICAL-c440t-255bca5e1b8eb39f9d3c216ffe843fca5b25ad01e1acff90ffda1f0a6a7dd99f3</originalsourceid><addsrcrecordid>eNqFkEtrGzEUhUVpaJzHuruiVXfj6GoeGi2LcdKAoZtmk43QSFeOyszIlTQF__vI2NBV6UpczncO4iPkM7A1sE48TIe45ozxNfBetvUHsgImRdX1DXwkqxLwqpZQX5OblH4xxvpWwCdyDbwRTUlX5HXrHJpMg6P5DeMUzNGMft7TMNMhzJamHHHe5zeqy4GjTtkbn4-nQkPHMO-rXGo0BZepxTkvEWkZwJjuyJXTY8L7y3tLXh63Pzffq92Pp-fNt11lmoblirftYHSLMPQ41NJJWxsOXflW39SuJANvtWWAoI1zkjlnNTimOy2sldLVt-TrefcQw-8FU1aTTwbHUc8YlqQEF4JLWf8X5AIAGtkV8OEMmhhSiujUIfpJx6MCpk7eVfGuTt7V2XtpfLlML8OE9i9_EV0AeQawmPjjMapkPM4GrY_Fv7LB_3P8HevIk3E</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>27111496</pqid></control><display><type>article</type><title>Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners</title><source>MEDLINE</source><source>Elsevier ScienceDirect Journals</source><creator>Pinto, José Renato Ribeiro ; Mesquita, Marcelo Ferraz ; Henriques, Guilherme Elias Pessanha ; de Arruda Nóbilo, Mauro Antôonio</creator><creatorcontrib>Pinto, José Renato Ribeiro ; Mesquita, Marcelo Ferraz ; Henriques, Guilherme Elias Pessanha ; de Arruda Nóbilo, Mauro Antôonio</creatorcontrib><description>Statement of Problem. Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging. Purpose. This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners to acrylic resin bases. Material and Methods. Four soft lining materials (Molloplast-B, Flexor, Permasoft, and Pro Tech) and 2 acrylic resins (Classico and Lucitone 199) were processed for testing according to manufacturers' instructions. Twenty rectangular specimens (10 × 10-mm2 cross-sectional area) and twenty cylinder specimens (12.7-mm diameter × 19.0-mm height) for each liner/resin combination were used for the tensile and deformation tests, respectively. Specimen shape and liner thickness were standardized. Samples were divided into a test group that was thermocycled 3000 times and a control group that was stored for 24 hours in water at 37°C. Mean bond strength, expressed in megapascals (MPa), was determined in the tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. Elasticity, expressed as percent of permanent deformation, was calculated with an instrument for measuring permanent deformation described in ADA/ANSI specification 18. Data from both tests were examined with 1-way analysis of variance and a Tukey test, with calculation of a Scheffé interval at a 95% confidence level. Results. In the tensile test under control conditions, Molloplast-B (1.51 ± 0.28 MPa [mean ± SD]) and Pro Tech (1.44 ± 0.27 MPa) liners had higher bond strength values than the others (P <.05). With regard to the permanent deformation test, the lowest values were observed for Molloplast-B (0.48% ± 0.19%) and Flexor (0.44% ± 0.14%) (P <.05). Under thermocycling conditions, the highest bond strength occurred with Molloplast-B (1.37 ± 0.24 MPa) (P <.05). With regard to the deformation test, Flexor (0.46% ± 0.13%) and Molloplast-B (0.44% ± 0.17%) liners had lower deformation values than the others (P <.05). Conclusion. The results of this in vitro study indicated that bond strength and permanent deformity values of the 4 soft denture liners tested varied according to their chemical composition. These tests are not completely valid for application to dental restorations because the forces they encounter are more closely related to shear and tear. However, the above protocol serves as a good method of investigation to evaluate differences between thermocycled and control groups. (J Prosthet Dent 2002;88:516-521.)</description><identifier>ISSN: 0022-3913</identifier><identifier>EISSN: 1097-6841</identifier><identifier>DOI: 10.1067/mpr.2002.128953</identifier><identifier>PMID: 12474002</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Acrylic Resins - chemistry ; Adhesiveness ; Analysis of Variance ; Biocompatible Materials - chemistry ; Confidence Intervals ; Dental Bonding ; Dentistry ; Denture Bases ; Denture Liners ; Dimethylpolysiloxanes - chemistry ; Elasticity ; Humans ; Materials Testing ; Methacrylates - chemistry ; Polymethacrylic Acids - chemistry ; Silicone Elastomers - chemistry ; Statistics as Topic ; Stress, Mechanical ; Surface Properties ; Temperature ; Tensile Strength ; Thermodynamics ; Time Factors ; Water - chemistry</subject><ispartof>The Journal of prosthetic dentistry, 2002-11, Vol.88 (5), p.516-521</ispartof><rights>2002 Editorial Council of The Journal of Prosthetic Dentistry</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c440t-255bca5e1b8eb39f9d3c216ffe843fca5b25ad01e1acff90ffda1f0a6a7dd99f3</citedby><cites>FETCH-LOGICAL-c440t-255bca5e1b8eb39f9d3c216ffe843fca5b25ad01e1acff90ffda1f0a6a7dd99f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1067/mpr.2002.128953$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,45974</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12474002$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Pinto, José Renato Ribeiro</creatorcontrib><creatorcontrib>Mesquita, Marcelo Ferraz</creatorcontrib><creatorcontrib>Henriques, Guilherme Elias Pessanha</creatorcontrib><creatorcontrib>de Arruda Nóbilo, Mauro Antôonio</creatorcontrib><title>Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners</title><title>The Journal of prosthetic dentistry</title><addtitle>J Prosthet Dent</addtitle><description>Statement of Problem. Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging. Purpose. This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners to acrylic resin bases. Material and Methods. Four soft lining materials (Molloplast-B, Flexor, Permasoft, and Pro Tech) and 2 acrylic resins (Classico and Lucitone 199) were processed for testing according to manufacturers' instructions. Twenty rectangular specimens (10 × 10-mm2 cross-sectional area) and twenty cylinder specimens (12.7-mm diameter × 19.0-mm height) for each liner/resin combination were used for the tensile and deformation tests, respectively. Specimen shape and liner thickness were standardized. Samples were divided into a test group that was thermocycled 3000 times and a control group that was stored for 24 hours in water at 37°C. Mean bond strength, expressed in megapascals (MPa), was determined in the tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. Elasticity, expressed as percent of permanent deformation, was calculated with an instrument for measuring permanent deformation described in ADA/ANSI specification 18. Data from both tests were examined with 1-way analysis of variance and a Tukey test, with calculation of a Scheffé interval at a 95% confidence level. Results. In the tensile test under control conditions, Molloplast-B (1.51 ± 0.28 MPa [mean ± SD]) and Pro Tech (1.44 ± 0.27 MPa) liners had higher bond strength values than the others (P <.05). With regard to the permanent deformation test, the lowest values were observed for Molloplast-B (0.48% ± 0.19%) and Flexor (0.44% ± 0.14%) (P <.05). Under thermocycling conditions, the highest bond strength occurred with Molloplast-B (1.37 ± 0.24 MPa) (P <.05). With regard to the deformation test, Flexor (0.46% ± 0.13%) and Molloplast-B (0.44% ± 0.17%) liners had lower deformation values than the others (P <.05). Conclusion. The results of this in vitro study indicated that bond strength and permanent deformity values of the 4 soft denture liners tested varied according to their chemical composition. These tests are not completely valid for application to dental restorations because the forces they encounter are more closely related to shear and tear. However, the above protocol serves as a good method of investigation to evaluate differences between thermocycled and control groups. (J Prosthet Dent 2002;88:516-521.)</description><subject>Acrylic Resins - chemistry</subject><subject>Adhesiveness</subject><subject>Analysis of Variance</subject><subject>Biocompatible Materials - chemistry</subject><subject>Confidence Intervals</subject><subject>Dental Bonding</subject><subject>Dentistry</subject><subject>Denture Bases</subject><subject>Denture Liners</subject><subject>Dimethylpolysiloxanes - chemistry</subject><subject>Elasticity</subject><subject>Humans</subject><subject>Materials Testing</subject><subject>Methacrylates - chemistry</subject><subject>Polymethacrylic Acids - chemistry</subject><subject>Silicone Elastomers - chemistry</subject><subject>Statistics as Topic</subject><subject>Stress, Mechanical</subject><subject>Surface Properties</subject><subject>Temperature</subject><subject>Tensile Strength</subject><subject>Thermodynamics</subject><subject>Time Factors</subject><subject>Water - chemistry</subject><issn>0022-3913</issn><issn>1097-6841</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkEtrGzEUhUVpaJzHuruiVXfj6GoeGi2LcdKAoZtmk43QSFeOyszIlTQF__vI2NBV6UpczncO4iPkM7A1sE48TIe45ozxNfBetvUHsgImRdX1DXwkqxLwqpZQX5OblH4xxvpWwCdyDbwRTUlX5HXrHJpMg6P5DeMUzNGMft7TMNMhzJamHHHe5zeqy4GjTtkbn4-nQkPHMO-rXGo0BZepxTkvEWkZwJjuyJXTY8L7y3tLXh63Pzffq92Pp-fNt11lmoblirftYHSLMPQ41NJJWxsOXflW39SuJANvtWWAoI1zkjlnNTimOy2sldLVt-TrefcQw-8FU1aTTwbHUc8YlqQEF4JLWf8X5AIAGtkV8OEMmhhSiujUIfpJx6MCpk7eVfGuTt7V2XtpfLlML8OE9i9_EV0AeQawmPjjMapkPM4GrY_Fv7LB_3P8HevIk3E</recordid><startdate>20021101</startdate><enddate>20021101</enddate><creator>Pinto, José Renato Ribeiro</creator><creator>Mesquita, Marcelo Ferraz</creator><creator>Henriques, Guilherme Elias Pessanha</creator><creator>de Arruda Nóbilo, Mauro Antôonio</creator><general>Elsevier Inc</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><scope>7X8</scope></search><sort><creationdate>20021101</creationdate><title>Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners</title><author>Pinto, José Renato Ribeiro ; Mesquita, Marcelo Ferraz ; Henriques, Guilherme Elias Pessanha ; de Arruda Nóbilo, Mauro Antôonio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c440t-255bca5e1b8eb39f9d3c216ffe843fca5b25ad01e1acff90ffda1f0a6a7dd99f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Acrylic Resins - chemistry</topic><topic>Adhesiveness</topic><topic>Analysis of Variance</topic><topic>Biocompatible Materials - chemistry</topic><topic>Confidence Intervals</topic><topic>Dental Bonding</topic><topic>Dentistry</topic><topic>Denture Bases</topic><topic>Denture Liners</topic><topic>Dimethylpolysiloxanes - chemistry</topic><topic>Elasticity</topic><topic>Humans</topic><topic>Materials Testing</topic><topic>Methacrylates - chemistry</topic><topic>Polymethacrylic Acids - chemistry</topic><topic>Silicone Elastomers - chemistry</topic><topic>Statistics as Topic</topic><topic>Stress, Mechanical</topic><topic>Surface Properties</topic><topic>Temperature</topic><topic>Tensile Strength</topic><topic>Thermodynamics</topic><topic>Time Factors</topic><topic>Water - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pinto, José Renato Ribeiro</creatorcontrib><creatorcontrib>Mesquita, Marcelo Ferraz</creatorcontrib><creatorcontrib>Henriques, Guilherme Elias Pessanha</creatorcontrib><creatorcontrib>de Arruda Nóbilo, Mauro Antôonio</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>MEDLINE - Academic</collection><jtitle>The Journal of prosthetic dentistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pinto, José Renato Ribeiro</au><au>Mesquita, Marcelo Ferraz</au><au>Henriques, Guilherme Elias Pessanha</au><au>de Arruda Nóbilo, Mauro Antôonio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners</atitle><jtitle>The Journal of prosthetic dentistry</jtitle><addtitle>J Prosthet Dent</addtitle><date>2002-11-01</date><risdate>2002</risdate><volume>88</volume><issue>5</issue><spage>516</spage><epage>521</epage><pages>516-521</pages><issn>0022-3913</issn><eissn>1097-6841</eissn><abstract>Statement of Problem. Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging. Purpose. This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners to acrylic resin bases. Material and Methods. Four soft lining materials (Molloplast-B, Flexor, Permasoft, and Pro Tech) and 2 acrylic resins (Classico and Lucitone 199) were processed for testing according to manufacturers' instructions. Twenty rectangular specimens (10 × 10-mm2 cross-sectional area) and twenty cylinder specimens (12.7-mm diameter × 19.0-mm height) for each liner/resin combination were used for the tensile and deformation tests, respectively. Specimen shape and liner thickness were standardized. Samples were divided into a test group that was thermocycled 3000 times and a control group that was stored for 24 hours in water at 37°C. Mean bond strength, expressed in megapascals (MPa), was determined in the tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. Elasticity, expressed as percent of permanent deformation, was calculated with an instrument for measuring permanent deformation described in ADA/ANSI specification 18. Data from both tests were examined with 1-way analysis of variance and a Tukey test, with calculation of a Scheffé interval at a 95% confidence level. Results. In the tensile test under control conditions, Molloplast-B (1.51 ± 0.28 MPa [mean ± SD]) and Pro Tech (1.44 ± 0.27 MPa) liners had higher bond strength values than the others (P <.05). With regard to the permanent deformation test, the lowest values were observed for Molloplast-B (0.48% ± 0.19%) and Flexor (0.44% ± 0.14%) (P <.05). Under thermocycling conditions, the highest bond strength occurred with Molloplast-B (1.37 ± 0.24 MPa) (P <.05). With regard to the deformation test, Flexor (0.46% ± 0.13%) and Molloplast-B (0.44% ± 0.17%) liners had lower deformation values than the others (P <.05). Conclusion. The results of this in vitro study indicated that bond strength and permanent deformity values of the 4 soft denture liners tested varied according to their chemical composition. These tests are not completely valid for application to dental restorations because the forces they encounter are more closely related to shear and tear. However, the above protocol serves as a good method of investigation to evaluate differences between thermocycled and control groups. (J Prosthet Dent 2002;88:516-521.)</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>12474002</pmid><doi>10.1067/mpr.2002.128953</doi><tpages>6</tpages></addata></record> |
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| subjects | Acrylic Resins - chemistry Adhesiveness Analysis of Variance Biocompatible Materials - chemistry Confidence Intervals Dental Bonding Dentistry Denture Bases Denture Liners Dimethylpolysiloxanes - chemistry Elasticity Humans Materials Testing Methacrylates - chemistry Polymethacrylic Acids - chemistry Silicone Elastomers - chemistry Statistics as Topic Stress, Mechanical Surface Properties Temperature Tensile Strength Thermodynamics Time Factors Water - chemistry |
| title | Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners |
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