EdgeBioCeramic RetroFill is a unique bioceramic repair material that exhibits superior healing and handling properties that has been shown to out perform MTA. EdgeBioCeramic RetroFill is pre-mixed and ready to use, unlike MTA. Simply syringe out a small amount of material and deliver to the repair site. Working Time: No mixing is required. The setting reaction begins as soon as the material is placed in contact with a moist environment. The working time is no more than 30 minutes. Setting Time: Minimum of 2 hours in normal conditions but can take longer to set in extremely dry canals.