Degree of conversion and permeability of dental adhesives
| Autor: | Matteo Biasotto, Carlo Prati, Franklin R. Tay, Luca Contardo, Salvatore Sauro, Roberto Di Lenarda, Milena Cadenaro, Francesca Antoniolli, Lorenzo Breschi |
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| Přispěvatelé: | CADENARO M., ANTONIOLLI F, SAURO S, TAY FRANKLIN R, DI LENARDA R, PRATI C, BIASOTTO M, CONTARDO L, BRESCHI L, Cadenaro, Milena, Antoniolli, Francesca, Sauro, S, TAY FRANKLIN, R, DI LENARDA, Roberto, Prati, C, Biasotto, Matteo, Contardo, Luca, Breschi, Lorenzo |
| Rok vydání: | 2005 |
| Předmět: |
Adult
Molar Materials science Light degree of conversion Dentistry In Vitro Techniques Composite Resins Indentation hardness Permeability Statistics Nonparametric dentine chemistry.chemical_compound Differential scanning calorimetry Adhesives Materials Testing Humans Composite material General Dentistry Curing (chemistry) dental bonding systems permeability polymerization Dental Leakage Analysis of Variance business.industry Dental Bonding technology industry and agriculture Middle Aged Dental Adhesives DENTIN BONDING SYSTEMS Resin Cements Monomer Polymerization chemistry Molar Third Adhesive dental bonding system business |
| Zdroj: | European Journal of Oral Sciences. 113:525-530 |
| ISSN: | 1600-0722 0909-8836 |
| DOI: | 10.1111/j.1600-0722.2005.00251.x |
| Popis: | The aim of this study was to analyse the extent of polymerization of different adhesive films in relation to their permeability. One adhesive of each class was investigated: OptiBond FL; One-Step; Clearfil Protect Bond; and Xeno III. Adhesive films were prepared and cured with XL-2500 (3M ESPE) for 20, 40 or 60 s. Polymerization kinetic curves of the adhesives tested were obtained with differential scanning calorimetry (DSC) and data were correlated with microhardness. The permeability of the adhesives under the same experimental conditions was evaluated on human extracted teeth connected to a permeability device and analysed statistically. The results showed that the extent of polymerization obtained from DSC exotherms was directly correlated with microhardness. An increased level of polymerization after prolonged light-curing was confirmed for all adhesives. Simplified adhesives exhibited a lower extent of polymerization and showed incomplete polymerization, even after 60 s. An inverse correlation was found between the degree of cure and the permeability. This study supports the hypothesis that the permeability of simplified adhesives is correlated with incomplete polymerization of resin monomers and the extent of light exposure. These adhesives may be rendered less permeable by using longer curing times than those recommended by the respective manufacturer. |
| Databáze: | OpenAIRE |
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