HomeEndodontics Sealer is used in RCT.. Fill in voids publisher :NIL NAM -March 20, 2017 Sealer is used in RCT to: 1- Fill in voids. *** 2- Increase strength of RC filling. 3- Disinfect the canal. Labels Endodontics Facebook Twitter Share:Sealer is used in RCT.. Fill in voids Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email