title: Effect of pH on sealing ability of white mineral trioxide aggregate as a root-end filling material.
abstract: The aim of the present study was to evaluate microleakage of mineral trioxide aggregate (MTA) used as a root-end filling material after its exposure to a range of acidic environments during hydration. Seventy single-rooted teeth were divided into 4 experimental and 2 control groups. All the teeth were instrumented, and their apices were resected. Root-end cavities were filled with white MTA in the experimental groups. In the control groups root-end cavities were not filled. Root-end fillings were exposed to acidic environments with pH values of 4.4, 5.4, 6.4, or 7.4 for 3 days in the experimental groups. Microleakage was evaluated by using bovine serum albumin. The evaluation was conducted at 24-hour intervals for 80 days. Data were analyzed by using one-way analysis of variance and a post hoc Tukey test. The earliest bovine serum albumin microleakage was observed in a pH value of 4.4 followed by pH values of 5.4, 6.4, and 7.4, respectively. There was a significantly longer time necessary for leakage to occur in samples stored in higher pH values (P < .000).
authors.affiliation: Department of Biomedical Engineering, Islamic Azad University, Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Saghiri
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Lotfi
authors.forename: Ali Mohammad
authors.initials: AM
authors.lastname: Saghiri
authors.forename: Sepideh
authors.initials: S
authors.lastname: Vosoughhosseini
authors.forename: Ali
authors.initials: A
authors.lastname: Fatemi
authors.forename: Vahab
authors.initials: V
authors.lastname: Shiezadeh
authors.forename: Bahram
authors.initials: B
authors.lastname: Ranjkesh
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D001047:Apicoectomy; D020148:Butyric Acid / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D004338:Drug Combinations; D006801:Humans; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry*; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D012709:Serum Albumin / Q000737:chemistry; D017640:Silicates / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D007202:Indicators and Reagents; D010087:Oxides; D012387:Root Canal Filling Materials; D012709:Serum Albumin; D017640:Silicates; C086631:mineral trioxide aggregate; D014867:Water; D020148:Butyric Acid