1. Post-Core Crown Heading to a further clinical longevity of teeth

6. Clinical Failure Rate of Posts and Cores Mean values † 6 yr 9 (196 of 2,220 9 (72 of 788) 1–69 mo Torbjörner, 1995 14 (8 of 56) 4–0 y Wallerstedt, 1984 8 (39 of 516) 1–10 y Mentink, 1993 11 (17 of 154) 3 y Hatzikyriakos, 1992 7 (9 of 138) 10 y or more Weine, 1991 9 (9 of 96) 5 y 9 Bergman, 1989 9 (36 of 420) 1–25 y Sorenson, 1984 12 (6 of 52) 5 y Turner, 1982 % Clinical Failure Study Length Lead Author

19. Basically, it is important to leave at least 5 mm of gutta percha at the apex of the root canal, because it is within the apical 5 mm of the root canal that 95% of lateral accessory canals split off from the main canal and anastomose with the exterior surface of the root. Should these lateral canals not be blocked with the gutta percha and the cement used to place the gutta percha, the chances of microleakage and percolation of microbes is drastically increased, thereby increasing the likelihood of an endodontic failure . Post apical end

34. POST AND CORE PLACEMENT TECHNIQUES

42. Thanx for listening