Aim: To assess the percentage volume of filling materials and voids in oval-shaped canals filled with either cold lateral condensation or warm compaction techniques, using micro-computed tomography (micro-CT).
Methodology: Twenty-four single-rooted maxillary premolar teeth with oval-shaped canals were selected, the root canals prepared, and assigned to 2 groups (n=12), according to the filling technique: cold lateral compaction (CLC) or warm vertical compaction (WVC). Each specimen was scanned using a micro-CT device at an isotropic resolution of 12.5 μm. Percentage volume of root filling materials and voids were calculated, and data were statistically analyzed using Student t-test and Friedman's test, with a significance level of 5%.
Results: Overall, mean percentage volume of gutta-percha, sealer and voids were 82.33 ± 3.14, 13.42 ± 2.91, and 4.26 ± 0.74, respectively, in the CLC group, and 91.73 ± 4.48, 7.70 ± 4.44, and 0.57 ± 0.44, respectively, in WVC group, with statistical significant difference between groups (p < 0.05). At the apical level, differences in the percentage volume of filling materials and voids between groups were not significant (p > 0.05). No root fillings were void-free.
Conclusions: Warm vertical compaction produced a significantly greater volume of gutta-percha and a significantly lower percentage of voids than those achieved with cold lateral compaction. Distribution of sealer and voids within the root canal space after root filling procedure was unpredictable, irrespective of the root filling method.