Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins
Thermal properties and degree of conversion (DC%) of two composite resins (microhybrid and nanocomposite) and two photo-activation methods (continuous and gradual) displayed by the light-emitting diode (LED) light-curing units (LCUs) were investigated in this study. Differential scanning calorimetry...
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| Veröffentlicht in: | Journal of thermal analysis and calorimetry 2011, Vol.103 (1), p.219-227 |
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| container_title | Journal of thermal analysis and calorimetry |
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| creator | Costa, S. X. S. Galvão, M. R. Jacomassi, D. P. Bernardi, M. I. B. Hernandes, A. C. de Souza Rastelli, A. N. Andrade, M. F. |
| description | Thermal properties and degree of conversion (DC%) of two composite resins (microhybrid and nanocomposite) and two photo-activation methods (continuous and gradual) displayed by the light-emitting diode (LED) light-curing units (LCUs) were investigated in this study. Differential scanning calorimetry (DSC) thermal analysis technique was used to investigate the glass transition temperature (
T
g
) and degradation temperature. The DC% was determined by Fourier transform infrared spectroscopy (FT-IR). The results showed that the microhybrid composite resin presented the highest
T
g
and degradation temperature values, i.e., the best thermal stability. Gradual photo-activation methods showed higher or similar
T
g
and degradation temperature values when compared to continuous method. The Elipar Freelight 2
TM
LCU showed the lowest
T
g
values. With respect to the DC%, the photo-activation method did not influence the final conversion of composite resins. However, Elipar Freelight 2
TM
LCU and microhybrid resin showed the lowest DC% values. Thus, the presented results suggest that gradual method photo-activation with LED LCUs provides adequate degree of conversion without promoting changes in the polymer chain of composite resins. However, the thermal properties and final conversion of composite resins can be influenced by the kind of composite resin and LCU. |
| doi_str_mv | 10.1007/s10973-010-1018-z |
| format | Article |
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T
g
) and degradation temperature. The DC% was determined by Fourier transform infrared spectroscopy (FT-IR). The results showed that the microhybrid composite resin presented the highest
T
g
and degradation temperature values, i.e., the best thermal stability. Gradual photo-activation methods showed higher or similar
T
g
and degradation temperature values when compared to continuous method. The Elipar Freelight 2
TM
LCU showed the lowest
T
g
values. With respect to the DC%, the photo-activation method did not influence the final conversion of composite resins. However, Elipar Freelight 2
TM
LCU and microhybrid resin showed the lowest DC% values. Thus, the presented results suggest that gradual method photo-activation with LED LCUs provides adequate degree of conversion without promoting changes in the polymer chain of composite resins. However, the thermal properties and final conversion of composite resins can be influenced by the kind of composite resin and LCU.</description><identifier>ISSN: 1388-6150</identifier><identifier>EISSN: 1588-2926</identifier><identifier>EISSN: 1572-8943</identifier><identifier>DOI: 10.1007/s10973-010-1018-z</identifier><language>eng</language><publisher>Dordrecht: Springer Netherlands</publisher><subject>Analysis ; Analytical Chemistry ; Application fields ; Applied sciences ; Calorimetry ; Chemistry ; Chemistry and Materials Science ; Conversion ; Degradation ; Direct current ; Exact sciences and technology ; Infrared spectroscopy ; Inorganic Chemistry ; Light-emitting diodes ; Measurement Science and Instrumentation ; Methods ; Nanostructure ; Nanotechnology ; Physical Chemistry ; Polymer industry, paints, wood ; Polymer Sciences ; Polymers ; Resins ; Technology of polymers ; Thermal properties</subject><ispartof>Journal of thermal analysis and calorimetry, 2011, Vol.103 (1), p.219-227</ispartof><rights>Akadémiai Kiadó, Budapest, Hungary 2010</rights><rights>2015 INIST-CNRS</rights><rights>COPYRIGHT 2011 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c424t-218b9f4d92f2882d0c24bc077d571db048069b871a46dd25c22223c117d1e1193</citedby><cites>FETCH-LOGICAL-c424t-218b9f4d92f2882d0c24bc077d571db048069b871a46dd25c22223c117d1e1193</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10973-010-1018-z$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10973-010-1018-z$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,4009,27902,27903,27904,41467,42536,51297</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23876949$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Costa, S. X. S.</creatorcontrib><creatorcontrib>Galvão, M. R.</creatorcontrib><creatorcontrib>Jacomassi, D. P.</creatorcontrib><creatorcontrib>Bernardi, M. I. B.</creatorcontrib><creatorcontrib>Hernandes, A. C.</creatorcontrib><creatorcontrib>de Souza Rastelli, A. N.</creatorcontrib><creatorcontrib>Andrade, M. F.</creatorcontrib><title>Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins</title><title>Journal of thermal analysis and calorimetry</title><addtitle>J Therm Anal Calorim</addtitle><description>Thermal properties and degree of conversion (DC%) of two composite resins (microhybrid and nanocomposite) and two photo-activation methods (continuous and gradual) displayed by the light-emitting diode (LED) light-curing units (LCUs) were investigated in this study. Differential scanning calorimetry (DSC) thermal analysis technique was used to investigate the glass transition temperature (
T
g
) and degradation temperature. The DC% was determined by Fourier transform infrared spectroscopy (FT-IR). The results showed that the microhybrid composite resin presented the highest
T
g
and degradation temperature values, i.e., the best thermal stability. Gradual photo-activation methods showed higher or similar
T
g
and degradation temperature values when compared to continuous method. The Elipar Freelight 2
TM
LCU showed the lowest
T
g
values. With respect to the DC%, the photo-activation method did not influence the final conversion of composite resins. However, Elipar Freelight 2
TM
LCU and microhybrid resin showed the lowest DC% values. Thus, the presented results suggest that gradual method photo-activation with LED LCUs provides adequate degree of conversion without promoting changes in the polymer chain of composite resins. However, the thermal properties and final conversion of composite resins can be influenced by the kind of composite resin and LCU.</description><subject>Analysis</subject><subject>Analytical Chemistry</subject><subject>Application fields</subject><subject>Applied sciences</subject><subject>Calorimetry</subject><subject>Chemistry</subject><subject>Chemistry and Materials Science</subject><subject>Conversion</subject><subject>Degradation</subject><subject>Direct current</subject><subject>Exact sciences and technology</subject><subject>Infrared spectroscopy</subject><subject>Inorganic Chemistry</subject><subject>Light-emitting diodes</subject><subject>Measurement Science and Instrumentation</subject><subject>Methods</subject><subject>Nanostructure</subject><subject>Nanotechnology</subject><subject>Physical Chemistry</subject><subject>Polymer industry, paints, wood</subject><subject>Polymer Sciences</subject><subject>Polymers</subject><subject>Resins</subject><subject>Technology of polymers</subject><subject>Thermal properties</subject><issn>1388-6150</issn><issn>1588-2926</issn><issn>1572-8943</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNp9kctq3TAQhk1poSHNA3TnTaFdONXIN6m7cOglECikyVrIkuyotaVTjRya0IfPnDgUsqm00Mzo-wf9o6J4C-wUGOs_IjDZ1xUDVgEDUd2_KI6gFaLikncvKa4p7qBlr4sTRD8wDqyTrZBHxd9dDNmHNa5Y6mDLKWm76rnc38QcK22yv9XZx1AuLt9Ei59KH8Z5dcG4kqrWTclRNJYmhluX8IAe-pgUEWcffhES0Oe7jVn2kRJXJoc-4Jvi1ahndCdP53Fx_eXz1e5bdfH96_nu7KIyDW9yxUEMcmys5CMXgltmeDMY1ve27cEOrBHkZhA96KazlreG06oNQG_BAcj6uHi_9d2n-Ht1mNXi0bh51sGRcQVdD7yWsm0IPd3QSc9OkdeYkza0rVs8eXSjp_pZ3Ure1rJjJPjwTEBMdn_ypFdEdf7j8jkLG_s4neRGtU9-0elOAVOHn1TbTyr2mINQ96R59_R2jUbPY9LBePwn5LXoO9kcPPKNQ7oKk0vqZ1xToLH-p_kDkDuuyA</recordid><startdate>2011</startdate><enddate>2011</enddate><creator>Costa, S. X. S.</creator><creator>Galvão, M. R.</creator><creator>Jacomassi, D. P.</creator><creator>Bernardi, M. I. B.</creator><creator>Hernandes, A. C.</creator><creator>de Souza Rastelli, A. N.</creator><creator>Andrade, M. F.</creator><general>Springer Netherlands</general><general>Springer</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>ISR</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>2011</creationdate><title>Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins</title><author>Costa, S. X. S. ; Galvão, M. R. ; Jacomassi, D. P. ; Bernardi, M. I. B. ; Hernandes, A. C. ; de Souza Rastelli, A. N. ; Andrade, M. F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c424t-218b9f4d92f2882d0c24bc077d571db048069b871a46dd25c22223c117d1e1193</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Analysis</topic><topic>Analytical Chemistry</topic><topic>Application fields</topic><topic>Applied sciences</topic><topic>Calorimetry</topic><topic>Chemistry</topic><topic>Chemistry and Materials Science</topic><topic>Conversion</topic><topic>Degradation</topic><topic>Direct current</topic><topic>Exact sciences and technology</topic><topic>Infrared spectroscopy</topic><topic>Inorganic Chemistry</topic><topic>Light-emitting diodes</topic><topic>Measurement Science and Instrumentation</topic><topic>Methods</topic><topic>Nanostructure</topic><topic>Nanotechnology</topic><topic>Physical Chemistry</topic><topic>Polymer industry, paints, wood</topic><topic>Polymer Sciences</topic><topic>Polymers</topic><topic>Resins</topic><topic>Technology of polymers</topic><topic>Thermal properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Costa, S. X. S.</creatorcontrib><creatorcontrib>Galvão, M. R.</creatorcontrib><creatorcontrib>Jacomassi, D. P.</creatorcontrib><creatorcontrib>Bernardi, M. I. B.</creatorcontrib><creatorcontrib>Hernandes, A. C.</creatorcontrib><creatorcontrib>de Souza Rastelli, A. N.</creatorcontrib><creatorcontrib>Andrade, M. F.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Gale In Context: Science</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of thermal analysis and calorimetry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Costa, S. X. S.</au><au>Galvão, M. R.</au><au>Jacomassi, D. P.</au><au>Bernardi, M. I. B.</au><au>Hernandes, A. C.</au><au>de Souza Rastelli, A. N.</au><au>Andrade, M. F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins</atitle><jtitle>Journal of thermal analysis and calorimetry</jtitle><stitle>J Therm Anal Calorim</stitle><date>2011</date><risdate>2011</risdate><volume>103</volume><issue>1</issue><spage>219</spage><epage>227</epage><pages>219-227</pages><issn>1388-6150</issn><eissn>1588-2926</eissn><eissn>1572-8943</eissn><abstract>Thermal properties and degree of conversion (DC%) of two composite resins (microhybrid and nanocomposite) and two photo-activation methods (continuous and gradual) displayed by the light-emitting diode (LED) light-curing units (LCUs) were investigated in this study. Differential scanning calorimetry (DSC) thermal analysis technique was used to investigate the glass transition temperature (
T
g
) and degradation temperature. The DC% was determined by Fourier transform infrared spectroscopy (FT-IR). The results showed that the microhybrid composite resin presented the highest
T
g
and degradation temperature values, i.e., the best thermal stability. Gradual photo-activation methods showed higher or similar
T
g
and degradation temperature values when compared to continuous method. The Elipar Freelight 2
TM
LCU showed the lowest
T
g
values. With respect to the DC%, the photo-activation method did not influence the final conversion of composite resins. However, Elipar Freelight 2
TM
LCU and microhybrid resin showed the lowest DC% values. Thus, the presented results suggest that gradual method photo-activation with LED LCUs provides adequate degree of conversion without promoting changes in the polymer chain of composite resins. However, the thermal properties and final conversion of composite resins can be influenced by the kind of composite resin and LCU.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s10973-010-1018-z</doi><tpages>9</tpages></addata></record> |
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| ispartof | Journal of thermal analysis and calorimetry, 2011, Vol.103 (1), p.219-227 |
| issn | 1388-6150 1588-2926 1572-8943 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1671239954 |
| source | SpringerLink Journals (MCLS) |
| subjects | Analysis Analytical Chemistry Application fields Applied sciences Calorimetry Chemistry Chemistry and Materials Science Conversion Degradation Direct current Exact sciences and technology Infrared spectroscopy Inorganic Chemistry Light-emitting diodes Measurement Science and Instrumentation Methods Nanostructure Nanotechnology Physical Chemistry Polymer industry, paints, wood Polymer Sciences Polymers Resins Technology of polymers Thermal properties |
| title | Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins |
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