Hardening of a dual-cure resin cement using QTH and LED curing units
OBJECTIVE: This study evaluated the surface hardness of a resin cement (RelyX ARC) photoactivated through indirect composite resin (Cristobal) disks of different thicknesses using either a light-emitting diode (LED) or quartz tungsten halogen (QTH) light source. MATERIAL AND METHODS: Eighteen resin...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of São Paulo
2010-04-01
|
| Series: | Journal of Applied Oral Science |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572010000200003 |
| _version_ | 1818840490500423680 |
|---|---|
| author | Maria Jacinta Moraes Coelho Santos Sheila Pestana Passos Monalisa Olga Lessa da Encarnação Gildo Coelho Santos Junior Marco Antonio Bottino |
| author_facet | Maria Jacinta Moraes Coelho Santos Sheila Pestana Passos Monalisa Olga Lessa da Encarnação Gildo Coelho Santos Junior Marco Antonio Bottino |
| author_sort | Maria Jacinta Moraes Coelho Santos |
| collection | DOAJ |
| description | OBJECTIVE: This study evaluated the surface hardness of a resin cement (RelyX ARC) photoactivated through indirect composite resin (Cristobal) disks of different thicknesses using either a light-emitting diode (LED) or quartz tungsten halogen (QTH) light source. MATERIAL AND METHODS: Eighteen resin cement specimens were prepared and divided into 6 groups according to the type of curing unit and the thickness of resin disks interposed between the cement surface and light source. Three indentations (50 g for 15 s) were performed on the top and bottom surface of each specimen and a mean Vickers hardness number (VHN) was calculated for each specimen. The data were analyzed using two-way ANOVA and Tukey-Kramer test was used for post-hoc pairwise comparisons. RESULTS: Increased indirect resin disk thickness resulted in decreased mean VHN values. Mean VHN values for the top surfaces of the resin cement specimens ranged from 23.2 to 46.1 (QTH) and 32.3 to 41.7 (LED). The LED curing light source produced higher hardness values compared to the QTH light source for 2- and 3-mm-thick indirect resin disks. The differences were clinically, but not statistically significant. Increased indirect resin disk thickness also resulted in decreased mean VHN values for the bottom surfaces of the resin cement: 5.8 to 19.1 (QTH) and 7.5 to 32.0 (LED). For the bottom surfaces, a statistically significant interaction was also found between the type of curing light source and the indirect resin disk thickness. CONCLUSION: Mean surface hardness values of resin cement specimens decreased with the increase of indirect resin disk thickness. The LED curing light source generally produced higher surface hardness values. |
| first_indexed | 2024-12-19T04:11:01Z |
| format | Article |
| id | doaj.art-c7d019df7d5f4b9ba5bd87e452f11e9b |
| institution | Directory Open Access Journal |
| issn | 1678-7757 1678-7765 |
| language | English |
| last_indexed | 2024-12-19T04:11:01Z |
| publishDate | 2010-04-01 |
| publisher | University of São Paulo |
| record_format | Article |
| series | Journal of Applied Oral Science |
| spelling | doaj.art-c7d019df7d5f4b9ba5bd87e452f11e9b2022-12-21T20:36:25ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652010-04-0118211011510.1590/S1678-77572010000200003Hardening of a dual-cure resin cement using QTH and LED curing unitsMaria Jacinta Moraes Coelho SantosSheila Pestana PassosMonalisa Olga Lessa da EncarnaçãoGildo Coelho Santos JuniorMarco Antonio BottinoOBJECTIVE: This study evaluated the surface hardness of a resin cement (RelyX ARC) photoactivated through indirect composite resin (Cristobal) disks of different thicknesses using either a light-emitting diode (LED) or quartz tungsten halogen (QTH) light source. MATERIAL AND METHODS: Eighteen resin cement specimens were prepared and divided into 6 groups according to the type of curing unit and the thickness of resin disks interposed between the cement surface and light source. Three indentations (50 g for 15 s) were performed on the top and bottom surface of each specimen and a mean Vickers hardness number (VHN) was calculated for each specimen. The data were analyzed using two-way ANOVA and Tukey-Kramer test was used for post-hoc pairwise comparisons. RESULTS: Increased indirect resin disk thickness resulted in decreased mean VHN values. Mean VHN values for the top surfaces of the resin cement specimens ranged from 23.2 to 46.1 (QTH) and 32.3 to 41.7 (LED). The LED curing light source produced higher hardness values compared to the QTH light source for 2- and 3-mm-thick indirect resin disks. The differences were clinically, but not statistically significant. Increased indirect resin disk thickness also resulted in decreased mean VHN values for the bottom surfaces of the resin cement: 5.8 to 19.1 (QTH) and 7.5 to 32.0 (LED). For the bottom surfaces, a statistically significant interaction was also found between the type of curing light source and the indirect resin disk thickness. CONCLUSION: Mean surface hardness values of resin cement specimens decreased with the increase of indirect resin disk thickness. The LED curing light source generally produced higher surface hardness values.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572010000200003HardnessCureResin cements |
| spellingShingle | Maria Jacinta Moraes Coelho Santos Sheila Pestana Passos Monalisa Olga Lessa da Encarnação Gildo Coelho Santos Junior Marco Antonio Bottino Hardening of a dual-cure resin cement using QTH and LED curing units Journal of Applied Oral Science Hardness Cure Resin cements |
| title | Hardening of a dual-cure resin cement using QTH and LED curing units |
| title_full | Hardening of a dual-cure resin cement using QTH and LED curing units |
| title_fullStr | Hardening of a dual-cure resin cement using QTH and LED curing units |
| title_full_unstemmed | Hardening of a dual-cure resin cement using QTH and LED curing units |
| title_short | Hardening of a dual-cure resin cement using QTH and LED curing units |
| title_sort | hardening of a dual cure resin cement using qth and led curing units |
| topic | Hardness Cure Resin cements |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572010000200003 |
| work_keys_str_mv | AT mariajacintamoraescoelhosantos hardeningofadualcureresincementusingqthandledcuringunits AT sheilapestanapassos hardeningofadualcureresincementusingqthandledcuringunits AT monalisaolgalessadaencarnacao hardeningofadualcureresincementusingqthandledcuringunits AT gildocoelhosantosjunior hardeningofadualcureresincementusingqthandledcuringunits AT marcoantoniobottino hardeningofadualcureresincementusingqthandledcuringunits |