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Reduction of polymerization contraction stress for dental composites by two-step light-activation
Objectives: The goal of this study was to assess the reduction of polymerization contraction stress of composites during a two-step light-activation process and to relate this reduction to the process of polymerization shrinkage and specimen thickness. Methods: Three test procedures were performed t...
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| Published in: | Dental materials 2002-09, Vol.18 (6), p.436-444 |
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| cites | cdi_FETCH-LOGICAL-c479t-c6f568e2716e48c1e180f08ef829610970c36ff52b9069258474d0e0e2b445d03 |
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| container_title | Dental materials |
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| creator | Lim, B.-S Ferracane, J.L Sakaguchi, R.L Condon, J.R |
| description | Objectives: The goal of this study was to assess the reduction of polymerization contraction stress of composites during a two-step light-activation process and to relate this reduction to the process of polymerization shrinkage and specimen thickness.
Methods: Three test procedures were performed to compare two-step light-activation with delay with one-step continuous irradiation of composites: polymerization contraction stress using a closed-loop servohydraulic testing instrument, polymerization shrinkage by a mercury dilatometer, and degree of conversion by FTIR. For the one-step continuous curing method, the samples were light-activated for 60
s at 330
mW/cm
2. For the two-step curing method, a 5
s light exposure at 60
mW/cm
2 was followed by 2
min without light exposure, and then a second light exposure for 60
s at 330
mW/cm
2. The same light parameters were used for measurements of stress, shrinkage, and degree of conversion. Three composites, Heliomolar, Herculite and Z100 were evaluated. The contraction stress experiments were repeated with varying thickness for Herculite using the one-step and two different two-step techniques.
Results: Polymerization contraction stress 10
min after light-activation was significantly reduced (
P |
| doi_str_mv | 10.1016/S0109-5641(01)00066-5 |
| format | article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_71877179</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0109564101000665</els_id><sourcerecordid>71877179</sourcerecordid><originalsourceid>FETCH-LOGICAL-c479t-c6f568e2716e48c1e180f08ef829610970c36ff52b9069258474d0e0e2b445d03</originalsourceid><addsrcrecordid>eNqFkNtKxDAQhoMouh4eQemV6EV10m2S5kpk8QSC4OE6dNOJRtqmJlllfXqzB_RSCAxkvn-G-Qg5pHBGgfLzJ6Agc8ZLegL0FAA4z9kGGdFKyBxAik0y-kV2yG4I7wkqC0m3yQ4tQFZMFCNSP2Iz09G6PnMmG1w779Db73r5o10ffb3qhugxhMw4nzXYx7pN3W5wwUYM2XSexS-Xh4hD1trXt5gvUp_LKftky9RtwIN13SMv11fPk9v8_uHmbnJ5n-tSyJhrbhivsBCUY1lpirQCAxWaqpA83SFAj7kxrJhK4LJgVSnKBhCwmJYla2C8R45XcwfvPmYYoups0Ni2dY9uFpRIZgQVMoFsBWrvQvBo1OBtV_u5oqAWbtXSrVqIU5Dewq1iKXe0XjCbdtj8pdYyE3CxAjCd-WnRq6At9hob61FH1Tj7z4ofJn-J_w</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>71877179</pqid></control><display><type>article</type><title>Reduction of polymerization contraction stress for dental composites by two-step light-activation</title><source>Elsevier</source><creator>Lim, B.-S ; Ferracane, J.L ; Sakaguchi, R.L ; Condon, J.R</creator><creatorcontrib>Lim, B.-S ; Ferracane, J.L ; Sakaguchi, R.L ; Condon, J.R</creatorcontrib><description>Objectives: The goal of this study was to assess the reduction of polymerization contraction stress of composites during a two-step light-activation process and to relate this reduction to the process of polymerization shrinkage and specimen thickness.
Methods: Three test procedures were performed to compare two-step light-activation with delay with one-step continuous irradiation of composites: polymerization contraction stress using a closed-loop servohydraulic testing instrument, polymerization shrinkage by a mercury dilatometer, and degree of conversion by FTIR. For the one-step continuous curing method, the samples were light-activated for 60
s at 330
mW/cm
2. For the two-step curing method, a 5
s light exposure at 60
mW/cm
2 was followed by 2
min without light exposure, and then a second light exposure for 60
s at 330
mW/cm
2. The same light parameters were used for measurements of stress, shrinkage, and degree of conversion. Three composites, Heliomolar, Herculite and Z100 were evaluated. The contraction stress experiments were repeated with varying thickness for Herculite using the one-step and two different two-step techniques.
Results: Polymerization contraction stress 10
min after light-activation was significantly reduced (
P<0.05) by the two-step method: 29.7% for Heliomolar, 26.5% for Herculite, and 19.0% for Z100. Total volumetric shrinkage and degree of conversion were not significantly different for composites cured by the two different techniques. Increasing the thickness of the composite sample reduced the measured contraction stress, especially for one of the two-step curing methods.
Significance: A combination of low initial energy density followed by a lag period before a final high-intensity light irradiation provides a reduction of polymerization contraction stresses in dental composites. The stress reductions cannot be attributed to reductions in degree of conversion or unrestrained volumetric shrinkage.</description><identifier>ISSN: 0109-5641</identifier><identifier>EISSN: 1879-0097</identifier><identifier>DOI: 10.1016/S0109-5641(01)00066-5</identifier><identifier>PMID: 12098572</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject>Acrylic Resins - chemistry ; Analysis of Variance ; Composite Resins - chemistry ; Composite Resins - radiation effects ; Dental composite ; Dentistry ; Humans ; Light ; Materials Testing - instrumentation ; Polymerization contraction stress ; Polymers - chemistry ; Polymers - radiation effects ; Polyurethanes - chemistry ; Resin Cements - chemistry ; Shrinkage ; Silicon Dioxide ; Spectroscopy, Fourier Transform Infrared ; Statistics as Topic ; Stress, Mechanical ; Surface Properties ; Time Factors ; Transducers ; Two-step light-activation ; Zirconium</subject><ispartof>Dental materials, 2002-09, Vol.18 (6), p.436-444</ispartof><rights>2002 Academy of Dental Materials</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c479t-c6f568e2716e48c1e180f08ef829610970c36ff52b9069258474d0e0e2b445d03</citedby><cites>FETCH-LOGICAL-c479t-c6f568e2716e48c1e180f08ef829610970c36ff52b9069258474d0e0e2b445d03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12098572$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Lim, B.-S</creatorcontrib><creatorcontrib>Ferracane, J.L</creatorcontrib><creatorcontrib>Sakaguchi, R.L</creatorcontrib><creatorcontrib>Condon, J.R</creatorcontrib><title>Reduction of polymerization contraction stress for dental composites by two-step light-activation</title><title>Dental materials</title><addtitle>Dent Mater</addtitle><description>Objectives: The goal of this study was to assess the reduction of polymerization contraction stress of composites during a two-step light-activation process and to relate this reduction to the process of polymerization shrinkage and specimen thickness.
Methods: Three test procedures were performed to compare two-step light-activation with delay with one-step continuous irradiation of composites: polymerization contraction stress using a closed-loop servohydraulic testing instrument, polymerization shrinkage by a mercury dilatometer, and degree of conversion by FTIR. For the one-step continuous curing method, the samples were light-activated for 60
s at 330
mW/cm
2. For the two-step curing method, a 5
s light exposure at 60
mW/cm
2 was followed by 2
min without light exposure, and then a second light exposure for 60
s at 330
mW/cm
2. The same light parameters were used for measurements of stress, shrinkage, and degree of conversion. Three composites, Heliomolar, Herculite and Z100 were evaluated. The contraction stress experiments were repeated with varying thickness for Herculite using the one-step and two different two-step techniques.
Results: Polymerization contraction stress 10
min after light-activation was significantly reduced (
P<0.05) by the two-step method: 29.7% for Heliomolar, 26.5% for Herculite, and 19.0% for Z100. Total volumetric shrinkage and degree of conversion were not significantly different for composites cured by the two different techniques. Increasing the thickness of the composite sample reduced the measured contraction stress, especially for one of the two-step curing methods.
Significance: A combination of low initial energy density followed by a lag period before a final high-intensity light irradiation provides a reduction of polymerization contraction stresses in dental composites. The stress reductions cannot be attributed to reductions in degree of conversion or unrestrained volumetric shrinkage.</description><subject>Acrylic Resins - chemistry</subject><subject>Analysis of Variance</subject><subject>Composite Resins - chemistry</subject><subject>Composite Resins - radiation effects</subject><subject>Dental composite</subject><subject>Dentistry</subject><subject>Humans</subject><subject>Light</subject><subject>Materials Testing - instrumentation</subject><subject>Polymerization contraction stress</subject><subject>Polymers - chemistry</subject><subject>Polymers - radiation effects</subject><subject>Polyurethanes - chemistry</subject><subject>Resin Cements - chemistry</subject><subject>Shrinkage</subject><subject>Silicon Dioxide</subject><subject>Spectroscopy, Fourier Transform Infrared</subject><subject>Statistics as Topic</subject><subject>Stress, Mechanical</subject><subject>Surface Properties</subject><subject>Time Factors</subject><subject>Transducers</subject><subject>Two-step light-activation</subject><subject>Zirconium</subject><issn>0109-5641</issn><issn>1879-0097</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNqFkNtKxDAQhoMouh4eQemV6EV10m2S5kpk8QSC4OE6dNOJRtqmJlllfXqzB_RSCAxkvn-G-Qg5pHBGgfLzJ6Agc8ZLegL0FAA4z9kGGdFKyBxAik0y-kV2yG4I7wkqC0m3yQ4tQFZMFCNSP2Iz09G6PnMmG1w779Db73r5o10ffb3qhugxhMw4nzXYx7pN3W5wwUYM2XSexS-Xh4hD1trXt5gvUp_LKftky9RtwIN13SMv11fPk9v8_uHmbnJ5n-tSyJhrbhivsBCUY1lpirQCAxWaqpA83SFAj7kxrJhK4LJgVSnKBhCwmJYla2C8R45XcwfvPmYYoups0Ni2dY9uFpRIZgQVMoFsBWrvQvBo1OBtV_u5oqAWbtXSrVqIU5Dewq1iKXe0XjCbdtj8pdYyE3CxAjCd-WnRq6At9hob61FH1Tj7z4ofJn-J_w</recordid><startdate>20020901</startdate><enddate>20020901</enddate><creator>Lim, B.-S</creator><creator>Ferracane, J.L</creator><creator>Sakaguchi, R.L</creator><creator>Condon, J.R</creator><general>Elsevier Ltd</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>7X8</scope></search><sort><creationdate>20020901</creationdate><title>Reduction of polymerization contraction stress for dental composites by two-step light-activation</title><author>Lim, B.-S ; Ferracane, J.L ; Sakaguchi, R.L ; Condon, J.R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c479t-c6f568e2716e48c1e180f08ef829610970c36ff52b9069258474d0e0e2b445d03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Acrylic Resins - chemistry</topic><topic>Analysis of Variance</topic><topic>Composite Resins - chemistry</topic><topic>Composite Resins - radiation effects</topic><topic>Dental composite</topic><topic>Dentistry</topic><topic>Humans</topic><topic>Light</topic><topic>Materials Testing - instrumentation</topic><topic>Polymerization contraction stress</topic><topic>Polymers - chemistry</topic><topic>Polymers - radiation effects</topic><topic>Polyurethanes - chemistry</topic><topic>Resin Cements - chemistry</topic><topic>Shrinkage</topic><topic>Silicon Dioxide</topic><topic>Spectroscopy, Fourier Transform Infrared</topic><topic>Statistics as Topic</topic><topic>Stress, Mechanical</topic><topic>Surface Properties</topic><topic>Time Factors</topic><topic>Transducers</topic><topic>Two-step light-activation</topic><topic>Zirconium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lim, B.-S</creatorcontrib><creatorcontrib>Ferracane, J.L</creatorcontrib><creatorcontrib>Sakaguchi, R.L</creatorcontrib><creatorcontrib>Condon, J.R</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Dental materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lim, B.-S</au><au>Ferracane, J.L</au><au>Sakaguchi, R.L</au><au>Condon, J.R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reduction of polymerization contraction stress for dental composites by two-step light-activation</atitle><jtitle>Dental materials</jtitle><addtitle>Dent Mater</addtitle><date>2002-09-01</date><risdate>2002</risdate><volume>18</volume><issue>6</issue><spage>436</spage><epage>444</epage><pages>436-444</pages><issn>0109-5641</issn><eissn>1879-0097</eissn><abstract>Objectives: The goal of this study was to assess the reduction of polymerization contraction stress of composites during a two-step light-activation process and to relate this reduction to the process of polymerization shrinkage and specimen thickness.
Methods: Three test procedures were performed to compare two-step light-activation with delay with one-step continuous irradiation of composites: polymerization contraction stress using a closed-loop servohydraulic testing instrument, polymerization shrinkage by a mercury dilatometer, and degree of conversion by FTIR. For the one-step continuous curing method, the samples were light-activated for 60
s at 330
mW/cm
2. For the two-step curing method, a 5
s light exposure at 60
mW/cm
2 was followed by 2
min without light exposure, and then a second light exposure for 60
s at 330
mW/cm
2. The same light parameters were used for measurements of stress, shrinkage, and degree of conversion. Three composites, Heliomolar, Herculite and Z100 were evaluated. The contraction stress experiments were repeated with varying thickness for Herculite using the one-step and two different two-step techniques.
Results: Polymerization contraction stress 10
min after light-activation was significantly reduced (
P<0.05) by the two-step method: 29.7% for Heliomolar, 26.5% for Herculite, and 19.0% for Z100. Total volumetric shrinkage and degree of conversion were not significantly different for composites cured by the two different techniques. Increasing the thickness of the composite sample reduced the measured contraction stress, especially for one of the two-step curing methods.
Significance: A combination of low initial energy density followed by a lag period before a final high-intensity light irradiation provides a reduction of polymerization contraction stresses in dental composites. The stress reductions cannot be attributed to reductions in degree of conversion or unrestrained volumetric shrinkage.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>12098572</pmid><doi>10.1016/S0109-5641(01)00066-5</doi><tpages>9</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0109-5641 |
| ispartof | Dental materials, 2002-09, Vol.18 (6), p.436-444 |
| issn | 0109-5641 1879-0097 |
| language | eng |
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| source | Elsevier |
| subjects | Acrylic Resins - chemistry Analysis of Variance Composite Resins - chemistry Composite Resins - radiation effects Dental composite Dentistry Humans Light Materials Testing - instrumentation Polymerization contraction stress Polymers - chemistry Polymers - radiation effects Polyurethanes - chemistry Resin Cements - chemistry Shrinkage Silicon Dioxide Spectroscopy, Fourier Transform Infrared Statistics as Topic Stress, Mechanical Surface Properties Time Factors Transducers Two-step light-activation Zirconium |
| title | Reduction of polymerization contraction stress for dental composites by two-step light-activation |
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