Bulk-fill versus conventional composite: A comparative analysis on degree of conversion
| Autor: | Hélida Gomes de Oliveira Barud, Cristiane de Melo Alencar, Edson Alves de Campos, Fernanda Ferreira Jassé, Juliana Maria Capelozza Boaventura, Alexandre Gatti |
|---|---|
| Přispěvatelé: | Araraquara School of Dentistry, Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Degree of conversion Potassium bromide 0206 medical engineering Composite number Analytical chemistry Infrared spectroscopy Composite resins 030206 dentistry 02 engineering and technology 020601 biomedical engineering Triglycine sulfate Absorbance 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry Diffuse reflection Irradiation Bulk-fill flowable General Dentistry Curing (chemistry) |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2019-10-06T16:50:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-05-01 Aim: This study aimed to determine the degree of conversion (DC) of two resin-based composites: A conventional nanohybrid composite and a bulk-fill flowable composite (SureFil® SDR™ flow). Materials and Methods: DC was evaluated at 1-, 2-, 3-, and 4-mm depths at varying irradiation times (20 and 40 s) by Fourier-transform infrared spectroscopy. Disc-shaped specimens of varying depths were prepared and photoactivated with a third-generation light-emitting diode light-curing unit. The specimens were stored for 24 h in the dark at ambient temperature and pulverized into a fine powder which was mixed with potassium bromide. After homogenization, the mixture pressed to form a pellet. All pellets were evaluated by an infrared spectrometer equipped with a triglycine sulfate detector using diffuse reflectance. The percentage of monomer conversion was determined from the ratio of the absorbance intensities of the aliphatic carbon-carbon double bonds (C = C) and the internal standard before and after the curing of the composite, represented by the aromatic carbon-carbon single bonds (C-C). Results: The DC data for the bulk-fill resin showed no significant difference (P > 0.05) for different irradiation depths, whereas for the conventional nanohybrid resins, statistical analyses revealed a significant result of the variables time and depth as well as the interaction between them. Conclusions: The results indicated that SDR™ achieves a 4-mm depth of cure with both 20- A nd 40-s light exposures. Department of Restorative Dentistry Center Zip Code 14804-300 Araraquara School of Dentistry, Rua Humaita, 2019, Apartament 11 Araraquara Chemistry Institute University of Saõ Paulo-UNESP Araraquara Chemistry Institute University of Saõ Paulo-UNESP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|