More often than not patients experience pain or sensitivity after undergoing a dental filling to restore a decayed tooth as most conventional fillings begin shrinking almost immediately after the procedure. At Indian Institute of Technology, Madras, researchers have come up with a new formulation of dental filling that does not shrink ensuring a pain-free treatment. The composite is made of unique organic resins and inorganic fillers. They are also biologically safe compared to the ones currently available in the market; the latter can affect the endocrine system apart from causing sensitivity issues post-treatment. Dr V Susila Anand of Madha Dental College, who is Head, department of conservative dentistry and endodontics, said conventional dental composites shrink by up to 5%. It not only leads to post-operative sensitivity or pain, but also causes gaps between the teeth and fillings. The endodontist, who was involved in developing the new composite, said several studies were conducted on rats during development of this formulation.”The formulation is unique and does not release chemical substances that have endocrine disruptive ability,” she said. “The research has a three-pronged approach – to curb post-operative sensitivity, shrinkage and improve biological safety,”.Researchers said conventional materials, besides discharging certain chemicals, also emanate heat during polymerisation (a chemical process) that can harm the pulp tissue and cause post-treatment complications. The new composite releases 50% less heat keeping the pulp tissue safe.