EFFECT OF THERMOCYCLING ON THE TENSILE AND SHEAR BOND STRENGTHS OF THREE SOFT LINERS TO A DENTURE BASE RESIN
Identifieur interne : 006742 ( Main/Exploration ); précédent : 006741; suivant : 006743EFFECT OF THERMOCYCLING ON THE TENSILE AND SHEAR BOND STRENGTHS OF THREE SOFT LINERS TO A DENTURE BASE RESIN
Auteurs : Carlos Nelson Elias ; Flavio Queiroz HenriquesSource :
- Journal of Applied Oral Science [ 1678-7757 ] ; 2007.
Abstract
In clinical practice, loss of adhesion between the silicone-based denture liner and the denture base resin is always an undesirable event that might cause loss of material softness, water sorption, bacterial colonization and functional failure of the prosthesis.
This study evaluated the effect of thermocycling on tensile and shear bond strengths of three soft liner materials to a denture base acrylic resin.
Three resilient liners (Mucopren-Soft, Mollosil-Plus and Dentusil) and a heat-polymerized acrylic resin (QC-20) were processed according to manufacturers’ directions. Sixty specimens (14 x 14 mm cross-sectional area) per bond strength test (20 for each liner) were fabricated and either stored in water at 37°C for 24 hours (control groups; n=10) or thermocycled 3,000 times in water between 5°C and 55°C (test groups; n=10). The specimens were tested in tensile and shear strength in a universal testing machine until fracture. Bond strength means were compared between water-stored and thermocycled groups for each material, as well as among materials for each treatment (water storage or thermocycling). Failure mode (adhesive, cohesive and mixed) after debonding was assessed. Data were analyzed statistically by paired Student’s t-test and ANOVA at 5% significance level.
The water-stored groups had statistically significant higher bond strengths than the thermocycled groups (p<0.05). Without thermocycling, Mucopren-Soft (2.83 ± 0.48 MPa) had higher bond strength than Mollosil-Plus (1.04 ± 0.26 MPa) and Dentusil (1.14 ± 0.51 MPa). After thermocycling, Mucopren-Soft (1.63 ± 0.48 MPa) had the highest bond strength (p<0.05).
The bond strength of the three soft denture liners tested in this study changed with their chemical composition and all of them exhibited higher bond strengths than those usually reported as clinically acceptable.
All soft lining materials tested in this study showed a significant decrease in the bond strength to an acrylic denture base resin after thermocycling. In spite of thermocycling, though, the silicone-based liners had satisfactory bond strengths for clinical application.
Url:
DOI: 10.1590/S1678-77572007000100005
PubMed: 19089094
PubMed Central: 4327206
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">EFFECT OF THERMOCYCLING ON THE TENSILE AND SHEAR BOND STRENGTHS OF THREE SOFT LINERS TO A DENTURE BASE RESIN</title><author><name sortKey="Elias, Carlos Nelson" sort="Elias, Carlos Nelson" uniqKey="Elias C" first="Carlos Nelson" last="Elias">Carlos Nelson Elias</name><affiliation><nlm:aff id="aff01">DSc, Professor at Materials Science Department, Military Institute of Engineering Rio de Janeiro, RJ - Brazil</nlm:aff><wicri:noCountry code="subfield">RJ - Brazil</wicri:noCountry></affiliation></author><author><name sortKey="Henriques, Flavio Queiroz" sort="Henriques, Flavio Queiroz" uniqKey="Henriques F" first="Flavio Queiroz" last="Henriques">Flavio Queiroz Henriques</name><affiliation><nlm:aff>NONE</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">19089094</idno><idno type="pmc">4327206</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4327206</idno><idno type="RBID">PMC:4327206</idno><idno type="doi">10.1590/S1678-77572007000100005</idno><date when="2007">2007</date><idno type="wicri:Area/Pmc/Corpus">002F94</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">002F94</idno><idno type="wicri:Area/Pmc/Curation">002F94</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">002F94</idno><idno type="wicri:Area/Pmc/Checkpoint">002703</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">002703</idno><idno type="wicri:Area/Ncbi/Merge">002521</idno><idno type="wicri:Area/Ncbi/Curation">002521</idno><idno type="wicri:Area/Ncbi/Checkpoint">002521</idno><idno type="wicri:doubleKey">1678-7757:2007:Elias C:effect:of:thermocycling</idno><idno type="wicri:Area/Main/Merge">006841</idno><idno type="wicri:Area/Main/Curation">006742</idno><idno type="wicri:Area/Main/Exploration">006742</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">EFFECT OF THERMOCYCLING ON THE TENSILE AND SHEAR BOND STRENGTHS OF THREE SOFT LINERS TO A DENTURE BASE RESIN</title><author><name sortKey="Elias, Carlos Nelson" sort="Elias, Carlos Nelson" uniqKey="Elias C" first="Carlos Nelson" last="Elias">Carlos Nelson Elias</name><affiliation><nlm:aff id="aff01">DSc, Professor at Materials Science Department, Military Institute of Engineering Rio de Janeiro, RJ - Brazil</nlm:aff><wicri:noCountry code="subfield">RJ - Brazil</wicri:noCountry></affiliation></author><author><name sortKey="Henriques, Flavio Queiroz" sort="Henriques, Flavio Queiroz" uniqKey="Henriques F" first="Flavio Queiroz" last="Henriques">Flavio Queiroz Henriques</name><affiliation><nlm:aff>NONE</nlm:aff></affiliation></author></analytic><series><title level="j">Journal of Applied Oral Science</title><idno type="ISSN">1678-7757</idno><idno type="eISSN">1678-7765</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Statement of problem</title><p>In clinical practice, loss of adhesion between the silicone-based denture liner and the denture base resin is always an undesirable event that might cause loss of material softness, water sorption, bacterial colonization and functional failure of the prosthesis.</p></sec><sec><title>Purpose</title><p>This study evaluated the effect of thermocycling on tensile and shear bond strengths of three soft liner materials to a denture base acrylic resin.</p></sec><sec><title>Material and methods</title><p>Three resilient liners (Mucopren-Soft, Mollosil-Plus and Dentusil) and a heat-polymerized acrylic resin (QC-20) were processed according to manufacturers’ directions. Sixty specimens (14 x 14 mm cross-sectional area) per bond strength test (20 for each liner) were fabricated and either stored in water at 37°C for 24 hours (control groups; n=10) or thermocycled 3,000 times in water between 5°C and 55°C (test groups; n=10). The specimens were tested in tensile and shear strength in a universal testing machine until fracture. Bond strength means were compared between water-stored and thermocycled groups for each material, as well as among materials for each treatment (water storage or thermocycling). Failure mode (adhesive, cohesive and mixed) after debonding was assessed. Data were analyzed statistically by paired Student’s t-test and ANOVA at 5% significance level.</p></sec><sec><title>Results</title><p>The water-stored groups had statistically significant higher bond strengths than the thermocycled groups (p<0.05). Without thermocycling, Mucopren-Soft (2.83 ± 0.48 MPa) had higher bond strength than Mollosil-Plus (1.04 ± 0.26 MPa) and Dentusil (1.14 ± 0.51 MPa). After thermocycling, Mucopren-Soft (1.63 ± 0.48 MPa) had the highest bond strength (p<0.05).</p></sec><sec><title>Conclusion</title><p>The bond strength of the three soft denture liners tested in this study changed with their chemical composition and all of them exhibited higher bond strengths than those usually reported as clinically acceptable.</p></sec><sec><title>Clinical Implications</title><p>All soft lining materials tested in this study showed a significant decrease in the bond strength to an acrylic denture base resin after thermocycling. In spite of thermocycling, though, the silicone-based liners had satisfactory bond strengths for clinical application.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Braden, M" uniqKey="Braden M">M Braden</name></author><author><name sortKey="Wright, Ps" uniqKey="Wright P">PS Wright</name></author><author><name sortKey="Parker, S" uniqKey="Parker S">S Parker</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Craig, Rg" uniqKey="Craig R">RG Craig</name></author><author><name sortKey="Gibbons, P" uniqKey="Gibbons P">P Gibbons</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Garcia, Rcmr" uniqKey="Garcia R">RCMR Garcia</name></author><author><name sortKey="Leon, Blt" uniqKey="Leon B">BLT Leon</name></author><author><name sortKey="Oliveira, Vmb" uniqKey="Oliveira V">VMB Oliveira</name></author><author><name sortKey="Cury, Aab" uniqKey="Cury A">AAB Cury</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hekimuglu, C" uniqKey="Hekimuglu C">C Hekimuglu</name></author><author><name sortKey="Anil, N" uniqKey="Anil N">N Anil</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kawano, F" uniqKey="Kawano F">F Kawano</name></author><author><name sortKey="Dootz, Er" uniqKey="Dootz E">ER Dootz</name></author><author><name sortKey="Koran, A" uniqKey="Koran A">A Koran</name></author><author><name sortKey="Craig, Rg" uniqKey="Craig R">RG Craig</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kulak Ozkan, Y" uniqKey="Kulak Ozkan Y">Y Kulak-Ozkan</name></author><author><name sortKey="Sertgoz, A" uniqKey="Sertgoz A">A Sertgoz</name></author><author><name sortKey="Gedik, H" uniqKey="Gedik H">H Gedik</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mccabe, Jf" uniqKey="Mccabe J">JF McCabe</name></author><author><name sortKey="Carrick, Te" uniqKey="Carrick T">TE Carrick</name></author><author><name sortKey="Kamohara, H" uniqKey="Kamohara H">H Kamohara</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Pinto, Jrr" uniqKey="Pinto J">JRR Pinto</name></author><author><name sortKey="Mesquita, Mf" uniqKey="Mesquita M">MF Mesquita</name></author><author><name sortKey="Henriques, Gep" uniqKey="Henriques G">GEP Henriques</name></author><author><name sortKey="Nobilo, Maa" uniqKey="Nobilo M">MAA Nobilo</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wright, Ps" uniqKey="Wright P">PS Wright</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list></list><tree><noCountry><name sortKey="Elias, Carlos Nelson" sort="Elias, Carlos Nelson" uniqKey="Elias C" first="Carlos Nelson" last="Elias">Carlos Nelson Elias</name><name sortKey="Henriques, Flavio Queiroz" sort="Henriques, Flavio Queiroz" uniqKey="Henriques F" first="Flavio Queiroz" last="Henriques">Flavio Queiroz Henriques</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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