Answer is b. Irregularities such as internal resorption or “C” shaped canals are best filled using thermally manipulated obturating material due to the nature that walls may not be completely instrumented and compaction pressure may not be applied directly.
There are several types of warm techniques. Some are done with standard gutta percha master cones utilizing Enhanced Heated Systems for softening of intracanal gutta percha as is the case with System B. The Core Carries Technique where a firm plastic core coated with gutta percha is place in an oven, heated then inserted into a sealer-lined canal. Most noted of this type is ThermaFil. And finally the Injectable Technique in which a continuously tapered funnel canal prep allows the flow of heat softened (in the neighborhood of 365o to 392oF) gutta percha material from the 20 gauge applicator of an injection gun. A definite apical matrix is essential for these techniques to prevent over extrusion of the material.
(Pathways of the Pulp 8th, p342-53)
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