00000ctm a22000003a 4500 UP-1685523046125455917 Buklod 20080207132301.0 a r |||| u| ta 080207s xx d r |||| u| (iLib)UPMNL-00000979627 UPDent eng LG 993.5 1988 D4 T58 Tiu, Bernice L. Effect of using a master cone with tugback and one without on the apical seal of obturated small curve canals A comparative study Bernice L. Tiu, Cecilia O. Tuazon. 22 leaves Seminar Paper--Doctor of Dental Medicine--University of the Philippines Manila. This study compared the effect of using a master cone with tugback and one without on the apical seal of obturated small curve canals. After exposure of the roots to a 0.25% methylene blue dye solution for 24 hours, a 7-day clearing technique was done to better observe dye penetration caused by apical leakage. Subsequent to this leakage was measured independently by two evaluators under low power magnification microscope and data was entered for statistical analysis. A t-test was then performed and since the score obtained was 0.234 which is lower than the t-table value of 2.048 at a .05 level of confidence, it was concluded that no significant difference in the apical leakage occured between the two experimental groups. Dental materials. Endodontics. Tuazon, Cecilia O. Porter, Irene (Adviser). UPMNL DENT LG 993.5 1988 D4 T58 Thesis