M K Wu1, A Kast'áková, P R Wesselink. 1. Department of Cariology Endodontology Pedodontology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands. M.Wu@acta.nl
Abstract
AIM: The aim of this study was to determine the quality of cold and warm gutta-percha fillings in oval canals. METHODOLOGY: Two groups of mandibular premolars with oval canals were selected after bucco-lingual and mesio-distal radiographs indicated an internal long: short diameter of > or =1.6 at a level 5 mm from the apex. After instrumentation they were obturated, respectively, by cold lateral compaction of gutta-percha cones (cold GP) and vertical compaction of warm gutta-percha (warm GP). Leakage along apical root fillings was measured using a fluid transport model. After the leakage test, horizontal sections were cut 2 and 4 mm from the apex. The area of the canal and gutta-percha in cross-sections was measured using an image analysis program. The quality of root fillings was evaluated by calculating the percentage of gutta-percha-filled canal area (PGP). RESULTS: No significant difference in leakage was found between the two groups (P = 0.570). The warm GP group produced significantly higher PGPs than the cold GP group 4 mm from the apex only (P = 0.522 at 2 mm: P = 0.000 at 4 mm). CONCLUSIONS: The percentage of gutta-percha-filled canal area using warm GP was greater than that of the cold GP in oval canals.
AIM: The aim of this study was to determine the quality of cold and warm gutta-percha fillings in oval canals. METHODOLOGY: Two groups of mandibular premolars with oval canals were selected after bucco-lingual and mesio-distal radiographs indicated an internal long: short diameter of > or =1.6 at a level 5 mm from the apex. After instrumentation they were obturated, respectively, by cold lateral compaction of gutta-percha cones (cold GP) and vertical compaction of warm gutta-percha (warm GP). Leakage along apical root fillings was measured using a fluid transport model. After the leakage test, horizontal sections were cut 2 and 4 mm from the apex. The area of the canal and gutta-percha in cross-sections was measured using an image analysis program. The quality of root fillings was evaluated by calculating the percentage of gutta-percha-filled canal area (PGP). RESULTS: No significant difference in leakage was found between the two groups (P = 0.570). The warm GP group produced significantly higher PGPs than the cold GP group 4 mm from the apex only (P = 0.522 at 2 mm: P = 0.000 at 4 mm). CONCLUSIONS: The percentage of gutta-percha-filled canal area using warm GP was greater than that of the cold GP in oval canals.
Authors: Guo-Hua Li; Li-Na Niu; Lisa C Selem; Ashraf A Eid; Brian E Bergeron; Ji-Hua Chen; David H Pashley; Franklin R Tay Journal: J Dent Date: 2014-04-24 Impact factor: 4.379