A STUDY IN-VITRO OF THREADED TITANIUM PINS USED FOR RETROGRADE OBTURATION OF ROOT CANALS

The microleakage of four retrograde filling materials was compared in vitro. Fifty-three single rooted teeth were instrumentated and root fi lled with resin chloroform and gutta-percha. The gutta-percha cones we re left extruding from the access opening. All teeth were apicected an d retrograde fillings placed. The materials used were a non gamma2 ama lgam (Amalcap), a glass ionomer cement (ChemFil II), threaded titanium pins cemented with a glass ionomer cement (ChemFil II) and identical titanium pins cemented with a silicone material (Adheseal). After remo val of the gutta-percha with tweezers, a radioactive isotope solution was placed in the teeth. Extraradicular samples were taken at 3, 7, 28 , 77 and 104 days. All retrograde fillings showed some microleakage. T he group with titanium pins cemented with silicone showed the least le akage: significantly less than the teeth with glass ionomer cement (P < 0.01) and with amalgam (P < 0.01). No significant differences were f ound between other groups.