‘Clinical Behaviour Of Composite Resin restoration Plasticized With Different techniques

Good marginal adaptation is the key for successful composite resin restorations as it can reduce microleakage. In the pursuit of improving the strength of composite resin, more fillers are incorporated. The resulting increased viscosity of the material might lead to compromised adaptation to the cavity. This along with polymerization shrinkage may lead to compromised clinical performance. Hence the reduction in viscosity of these materials may improve the marginal adaptation and clinical performance. Preheating of composite resin reduces viscosity and increases flowability, which facilitates better adaptation to cavity walls. The problem here is once composite is pre-heated; there is a time delay between dispensing it from a syringe, placing it into preparation, and subsequently light polymerizing it. It is estimated that when a composite is heated up to 60 â—¦C and removed from the device, the temperature reduces 50% after 2min and 90% after 5min. The problem associated here is their limited literature on the clinical use of preheated composite. Another recent introduction of sonic fill (kerr corp. USA) combines the attributes of a low viscosity composite and a universal composite. By plasticizing composite with sonic energy, it is possible to fill the cavity and adapt the low viscosity material easily and then compact it while composite changes its consistency until it reaches a higher viscosity. But it is not recommended due to the high cost and unavailability in India. By simulating this concept, it was thought that conventional ultrasonic tips may be used for generating ultrasonic vibrations and possible to alter the consistency of high viscosity material to a consistency that can be compacted and made to adapt to cavity walls.