A female patient aged 40 years comes for routine general examination. Full mouth radiographs are taken. Oval shaped radiolucent areas are seen in the root canals of maxillary central incisors Teeth are asymptomatic and show feeble response to vitality tests.

How do you obturate the canal?
Thermafill technique Vertical compaction technique Thermoplasticised gutta-percha technique Lateral compaction technique