Glass transition and degree of conversion of a light-cured orthodontic composite
| dc.contributor.author | Sostena, Michela M.D.S. [UNESP] | |
| dc.contributor.author | Nogueira, Renata A. [UNESP] | |
| dc.contributor.author | Grandini, Carlos R. [UNESP] | |
| dc.contributor.author | Moraes, João Carlos Silos [UNESP] | |
| dc.contributor.institution | Universidade Estadual Paulista (UNESP) | |
| dc.date.accessioned | 2022-04-28T20:59:00Z | |
| dc.date.available | 2022-04-28T20:59:00Z | |
| dc.date.issued | 2009-01-01 | |
| dc.description.abstract | Objective: This study evaluated the glass transition temperature (Tg) and degree of conversion (DC) of a light-cured (Fill Magic) versus a chemically cured (Concise) orthodontic composite. Material and Methods: Anelastic relaxation spectroscopy was used for the first time to determine the Tg of a dental composite, while the DC was evaluated by infrared spectroscopy. The light-cured composite specimens were irradiated with a commercial LED light-curing unit using different exposure times (40, 90 and 120 s). Results: Fill Magic presented lower Tg than Concise (35-84°C versus 135°C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower Tg than Concise due to its higher organic phase content, and that when this light-cured composite is used to bond orthodontic brackets, a minimum energy density of 7.8 J/cm2 is necessary to reach adequate conversion level and obtain satisfactory adhesion. | en |
| dc.description.affiliation | Department of Physics and Chemistry São Paulo State University, Ilha Solteira, SP | |
| dc.description.affiliation | Department of Physics São Paulo State University, Bauru, SP | |
| dc.description.affiliationUnesp | Department of Physics and Chemistry São Paulo State University, Ilha Solteira, SP | |
| dc.description.affiliationUnesp | Department of Physics São Paulo State University, Bauru, SP | |
| dc.format.extent | 570-573 | |
| dc.identifier | http://dx.doi.org/10.1590/S1678-77572009000600006 | |
| dc.identifier.citation | Journal of Applied Oral Science, v. 17, n. 6, p. 570-573, 2009. | |
| dc.identifier.doi | 10.1590/S1678-77572009000600006 | |
| dc.identifier.issn | 1678-7765 | |
| dc.identifier.issn | 1678-7757 | |
| dc.identifier.scopus | 2-s2.0-72549090914 | |
| dc.identifier.uri | http://hdl.handle.net/11449/225703 | |
| dc.language.iso | eng | |
| dc.relation.ispartof | Journal of Applied Oral Science | |
| dc.source | Scopus | |
| dc.subject | Degree of conversion | |
| dc.subject | Glass transition temperature | |
| dc.subject | Infra-red spectroscopy | |
| dc.subject | Mechanical spectroscopy | |
| dc.subject | Orthodontic composite | |
| dc.title | Glass transition and degree of conversion of a light-cured orthodontic composite | en |
| dc.type | Artigo | |
| unesp.department | Física - FC | pt |
| unesp.department | Física e Química - FEIS | pt |