OBJECTIVES: The aim of this study was to analyze the polymerization kinetics of different adhesive films in relation to their permeability after exposure to different LED curing units. METHODS: One adhesive from each class was analyzed: a three-step etch-and-rinse (OptiBond FL; Sybron-Kerr), a two-step etch-and-rinse (One-Step, Bisco), a two-step self-etch (Clearfil Protect Bond, Kuraray) and a one-step self-etch adhesive (Xeno III; Dentsply DeTrey). Adhesive films were prepared and cured with SmartLite IQ (Dentsply) or L.E. Demetron I (Demetron Kerr) up to complete curing. Polymerization kinetic curves of the tested adhesives were obtained with differential scanning calorimetry (DSC). In particular, total reaction time and extent of polymerization (Ep) at 20, 40 or 60s were compared. Permeability of the adhesive films was evaluated on flat dentin surfaces of human extracted teeth connected to a permeability device and statistically analyzed. RESULTS: Total reaction time differed among the adhesives tested: OptiBond FL<Clearfil Protect Bond<One-Step<Xeno III with both curing units (p<0.05). At 20s OptiBond FL showed the highest Ep, while the lowest values were obtained with One-Step and Xeno III (p<0.05). E(p) increased when curing time was prolonged (40 and 60s) for all adhesives tested (p<0.05), however, on simplified adhesives, incomplete polymerization took place even after prolonged exposure intervals. An inverse correlation was found between Ep of the adhesives and their permeability using LED curing units. SIGNIFICANCE: This study supports the hypothesis that, longer curing times than those recommended by the respective manufacturer decrease permeability of the bonded interfaces.
OBJECTIVES: The aim of this study was to analyze the polymerization kinetics of different adhesive films in relation to their permeability after exposure to different LED curing units. METHODS: One adhesive from each class was analyzed: a three-step etch-and-rinse (OptiBond FL; Sybron-Kerr), a two-step etch-and-rinse (One-Step, Bisco), a two-step self-etch (Clearfil Protect Bond, Kuraray) and a one-step self-etch adhesive (Xeno III; Dentsply DeTrey). Adhesive films were prepared and cured with SmartLite IQ (Dentsply) or L.E. Demetron I (Demetron Kerr) up to complete curing. Polymerization kinetic curves of the tested adhesives were obtained with differential scanning calorimetry (DSC). In particular, total reaction time and extent of polymerization (Ep) at 20, 40 or 60s were compared. Permeability of the adhesive films was evaluated on flat dentin surfaces of human extracted teeth connected to a permeability device and statistically analyzed. RESULTS: Total reaction time differed among the adhesives tested: OptiBond FL<Clearfil Protect Bond<One-Step<Xeno III with both curing units (p<0.05). At 20s OptiBond FL showed the highest Ep, while the lowest values were obtained with One-Step and Xeno III (p<0.05). E(p) increased when curing time was prolonged (40 and 60s) for all adhesives tested (p<0.05), however, on simplified adhesives, incomplete polymerization took place even after prolonged exposure intervals. An inverse correlation was found between Ep of the adhesives and their permeability using LED curing units. SIGNIFICANCE: This study supports the hypothesis that, longer curing times than those recommended by the respective manufacturer decrease permeability of the bonded interfaces.
Authors: R Banu Ermis; Kirsten L Van Landuyt; Marcio Vivan Cardoso; Jan De Munck; Bart Van Meerbeek; Marleen Peumans Journal: Clin Oral Investig Date: 2011-05-21 Impact factor: 3.573
Authors: Milena Cadenaro; Francesca Antoniolli; Barbara Codan; Kelli Agee; Franklin R Tay; Elettra De Stefano Dorigo; David H Pashley; Lorenzo Breschi Journal: Dent Mater Date: 2009-12-16 Impact factor: 5.304
Authors: Juliana Malacarne-Zanon; Safira M de Andrade E Silva; Linda Wang; Mario F de Goes; Adriano Luis Martins; Eliene O Narvaes-Romani; Andrea Anido-Anido; Marcela R O Carrilho Journal: Eur J Dent Date: 2010-10
Authors: Marcela R Carrilho; Franklin R Tay; Adam M Donnelly; Kelli A Agee; Ricardo M Carvalho; Keiichi Hosaka; Alessandra Reis; Alessandro D Loguercio; David H Pashley Journal: J Biomed Mater Res B Appl Biomater Date: 2009-02 Impact factor: 3.368
Authors: Milena Cadenaro; Lorenzo Breschi; Frederick A Rueggeberg; Kelli Agee; Roberto Di Lenarda; Marcela Carrilho; Franklin R Tay; David H Pashley Journal: Dent Mater Date: 2008-06-20 Impact factor: 5.304