Strength and Fatigue Properties of Modern Dental Composites with Various Filler Distributions
59 MDW San Antonio United States
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In dentistry, failure of restorations can occur neither with any auditory forewarning nor with any visible deformation, making this, an unpredictable catastrophic event. A close examination of these failures suggests their origins are often associated with facture and fatigue. The goal is to develop robust dental materials with compositions and structures that can resist the synergetic effects of fatigue and facture. For many materials, the prolonged and repeated application of loads not only can introduce new flaws but also can perturb existing nano- and micro-structural defects, causing them to coalesce and form large defects. Particularly, a point defect can be stressed by moistures present in the environment growing slowly to form micro-crack, then accelerating under further perturbation until the material is finally buckled. The accumulation of these damages, which can have both direct and indirect consequences to macro-scale, bulk failure, are dependent on the presence, location, and distribution of materials intrinsic defects or flaws. These defects are pores, impurities, and cracks ranged across various length scales and can also be derived from grain boundary transition of from phase transformation during processing. An understanding of the patterns and characteristics of flaws and their interactions such as nucleation, growth, and propagation with nearby cracks and material structural hierarchy is key in the prediction of dental materials susceptibility and survival.
- Medicine and Medical Research