Mercury Intrusion Porosimetry and Assessment of Cement-dentin Interface of Anti-washout-type Mineral Trioxide Aggregate

摘要

White mineral trioxide aggregate (MTA) is a dental cement with an ability to set in the presence of moisture (1). MTA has numerous applications including pulp capping (2), apexification (3), repair of root perforations (4), root-end filling (5), and others (6). When MTA is used as a root-end filling material, it is in contact with both dentin and bone at the periapex. The interaction of MTA with physiological solutions has been well documented. The Portland cement component of MTA interacts with physiological fluids, and a reaction of calcium hydroxide with phosphates present in tissue fluids occurs (7-9)- An amorphous calcium phosphate phase is initially formed and then transformed to an apatite phase, with the latter consisting of calcium-deficient, poorly crystalline, B-type carbonated apatite crystallites. Amorphous calcium phosphate is a key intermediate that precedes biological apatite formation in skeletal calcification (9).