Dental Cements and Quasielastic Neutron Scattering: Meeting the Challenges of Today's Health Concerns
In typical odontological studies water sorption in the restoration material is determined by weighting a freshly mixed cement at regular intervals. In the case of resin-modified cement, such process was proven to be rapid; and over the first 8 h, absorption was shown to follow Ficks law. These findings were attributed to conformational changes in hydrophilic segments of the polymer on absorption of aqueous sodium chloride. It is considered that in this scenario the molecules form more compact coils than in the presence of pure water. To improve such evaluation process, to compare different dental cements and, at the same time, to develop new materials to be used in dental treatment, insight on parameters such as consistency, working and setting times, as well as the chemical reaction dynamics are important. Such factors are usually hard to determine accurately and non-destructively. Two techniques, however, NMR and QENS have the potential to be successfully used for such studies. Here we propose to use QENS to understand how the dynamics of the liquid used in the hydration process in dental cement is modified when confined and relate the results get to durability properties.
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NUNES BORDALLO Heloisa; Benetti AR; M. C. Berg; SEYDEL Tilo and Mark T F Telling. (2015). Dental Cements and Quasielastic Neutron Scattering: Meeting the Challenges of Today's Health Concerns. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-407
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