Ultramorphological Assessment of Dentin-Resin Interface
· The FIB milling procedure was conducted in a cryogenic state (Cryo-FIB) using a liquid nitrogen coolant reservoir attached to a specimen milling stage. FIB milling is based on the impact interaction between profound ions produced mainly by a gallium source that is accelerated in a high electrical voltage field of 10 kV, and the tooth surface's sample yielding a fine beam.