COMPARATIVE EVALUATION OF CORONAL LEAKAGE PREVENTIVE ABILITY OF FOUR ORIFICE BARRIER MATERIALS IN ENDODONTICALY TREATED TEETH: AN IN VITRO DYE LEAKAGE STUDY.

It is often stated that the quality of root canal fill in is the deciding factor between success and failure in endodontic treatment. The lack of coronal seal (by inappropriate or absent temporary or permanent restoration) allows bacteria and bacterial factors (metabolites and structural components, such as endotoxin) from the oral cavity to penetrate the obturating materials and eventually reach the apical foramen. Some of these bacterial factors, particularly endotoxin, can cause inflammation of the periapical tissues, there by requiring retreatment or periradicular surgery. Marginal leakage due to poor coronal/apical seal results in swelling, pain and the usual symptoms of an acute abscess of endodontic infections. Weak coronal sealing may occurin a variety of clinical cases such as a fracture in one of the components of leakage in the final restoration, occurrence of relapsing caries and hence the occurrence of a subsequent coronalleakage. To avoid the contamination inthe endodontically treated root canalsin any of the aforementioned clinicalcases, root canal intra-orifice must besealed using various restorative materialsbefore placing the final restoration.This procedure helps to a greatextent in protecting the root canalsfrom contamination. The aim of the present study wasto compare the ability of four restorativematerials (a self-adhesiveflowablecomposite;Perma Flow Purple (Ultradent), GrayProRoot MTA (Dentsply Tulsa Dental, Tulsa, OK) Cavit(Amdent)and glass ionomer cement (Fuji IX ,GC Corporation, America) to sealthe root canal entry of endodonticallytreated teeth and to prevent leakagefrom the crown along the canal reachingthe apex.