Development and clinical evaluation of Chitra visible light cure composite

Two paste, self cured BIS-GMA based resin was developed and physicochemical and biological characterization carried out. Its suitability and safety for clinical use were evaluated. Clinical trials for direct bonding of Orthodontic brackets conducted at the College of Dental Surgery, Manipal showed a success rate of 83% against 85% with "Right On" adhesive used as control. Further research to improve shelf life of the material led to the development of light cure-BIS-GMA based resin. It was evaluated for physicochemical characteristics which included setting time, compressive strength, diametral tensile strength, microhardness, water sorption and exothermic reaction. Biological characterization studies on material toxicity and biocompatibility on animal models established the safety and suitability of this composite for clinical use in dentistry. Clinical evaluation for direct bonding of Orthodontic brackets in comparison to Ultralight (T.P Orthodontics, USA) showed its handling characteristics to be superior to control. Flash removal was easier around bracket bases bonded with Chitra light cure. However, bond strength of light cure composite was 66% as compared to 79% with Ultralight. Subsequent improvement of the material increased the bond strength significantly. Failure rate with the new material was 11% against 13% with control in the ongoing clinical trials.