New dental tool creates stronger bonds for fillings

Dental composites are the synthetic resins or mixtures dentists use to restore teeth to their original hardness and rigidity. Made of amalgams—mixtures of mercury, silver or tin, or composites such as silica, ceramic or plastic compounds—longevity and performance often vary, and the composites are prone to breakages. Now, a University of Missouri engineer who has developed a "flowable" composite that can be injected in a cavity and hardened through a high-intensity light, recently re