Technology 3 n Vitro Leakage Associated with Three Root - filling echniques in Large and Extremely Large Root Canals

T s e d a c w m bstract his study assessed the apical leakage of ultrasonically ondensed root fillings in extremely large canals, comared to cold lateral condensation and thermoplastic ompaction. Ninety single-rooted teeth were used. In 5 teeth canals were enlarged to size 70 (large). The emaining 45 canals were enlarged to size 140 (exremely large). Each set of teeth was subdivided into hree root-filling groups (n 15): (1) cold lateral ondensation (LC); (2) thermoplastic compaction (TC); nd (3) ultrasonic lateral condensation (UC). Teeth in all ix subgroups were subjected to drawing ink penetraion, cleared, and evaluated for linear apical dye leakge. Significantly deeper dye penetration (p 0.04, ilcoxon rank-sum test) was observed for LC than for C. TC did not differ significantly from LC and UC. Dye enetration was significantly deeper (p 0.0001) in anals enlarged to size 140 than to size 70, indepenent of root-filling method. Apical leakage associated ith ultrasonically condensed root fillings was less than hat with cold lateral condensation. It was consistently reater in extremely large canals than that in large nes. (J Endod 2007;33:306–309)