title: Quartz crystal microbalance and photoacoustic measurements in dental photocuring.
abstract: Photocured dental resins are used extensively in restorative procedures in dentistry. Inadequate curing reduces the lifetime of the dental restoration, and consequently it is essential to precisely measure the polymerisation kinetics. In this study, two techniques, Quartz Crystal Microbalance (QCM) and Photoacoustic Spectroscopy (PAS), were used to monitor the real-time cure and to obtain the optical absorption spectra of resins, respectively. From the PAS measurements, the precise peaks of absorption were identified, and were used as the appropriate wavelength of the photocuring light in the QCM monitoring. The combined use of these techniques allows reliable determination of the duration of the phases of physical and chemical changes that occur during photocuring. Two commercial dental resins were tested, and the results confirmed the advantages of using PAS and QCM to study polymerisation kinetics.
authors: Instituto Politécnico, IPRJ, Universidade do Estado do Rio de Janeiro, UERJ, P.O. Box 97282, 28.625-570 Nova Friburgo, Rio de Janeiro, Brazil.
authors: Marcenilda A
authors: MA
authors: Lima
authors: Instituto Politécnico, IPRJ, Universidade do Estado do Rio de Janeiro, UERJ, P.O. Box 97282, 28.625-570 Nova Friburgo, Rio de Janeiro, Brazil.
authors: Ivan N
authors: IN
authors: Bastos
authors: Instituto Politécnico, IPRJ, Universidade do Estado do Rio de Janeiro, UERJ, P.O. Box 97282, 28.625-570 Nova Friburgo, Rio de Janeiro, Brazil.
authors: Norberto
authors: N
authors: Cella
mesh_terms: D055117:Curing Lights, Dental; D061088:Photoacoustic Techniques / Q000295:instrumentation / Q000379:methods; D055668:Photochemical Processes; D058525:Quartz Crystal Microbalance Techniques / Q000295:instrumentation / Q000379:methods; D012117:Resins, Synthetic / Q000737:chemistry*
chemical_list: D012117:Resins, Synthetic