Loww Shrinkage Composite. Part I: Modeling of Viscoelasticc Behavior during Setting
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چکیده
t Muchh attention has been directed toward developing dental restorative compositess that generate less shrinkage stress during setting. The aim of this studyy was to explore the viscoelastic behavior of a new class of low-shrinkage dentall restorative composites during sett ing. The setting behavior of an experimentall oxirane composite was investigated by analyzing stress-strain data byy means of 2-parametric mechanical models. The experimental data were obtainedd using a dynamic test method, in which the setting light-activated compositee was continously subjected to sinusoidal strain cycles. The material parameterss and the model's predictive capacity were analyzed by means of validatedd modeling procedures. Thee light-activated oxirane composite exhibited shrinkage delay and lower polymerizationn shrinkage strain and stresses than conventional light-activated composites.. Due to noise in the stress data, the predictive ability of the Maxwell modell was restricted to the elastic modulus development of the composite. The shrinkagee stress development makes this composite a candidate for use in restorativee dentistry. In determining their potential as restorative material evaluationn tests will be necessary to establish whether the mechanical properties off oxirane composites are acceptable for dental use.
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