title: Quantitative microleakage evaluation around amalgam restorations with different treatments on cavity walls.
abstract: The purpose of this in vitro study was to evaluate the dye penetration around amalgam restorations in dentin cavities by a quantitative test. Standardized circular cavities were prepared on the facial surface of 75 extracted human single-rooted teeth, and restored with dental amalgam. Different bonding/sealing treatments were used on the cavity walls before the restorations were placed. The specimens were thermo-cycled between 5 +/- 2 degrees C and 55 +/- 2 degrees C for 500 cycles with 1-minute dwell times, followed by immersion in a 2% methylene blue solution for 12 hours at 37 degrees C. The quantitative microleakage was evaluated by spectrophotometry and was expressed by microgram dye per tooth structure. The results showed that the use of bonded amalgam restorations was more effective in reducing microleakage.
authors.affiliation: Dentistry School of Piracicaba-UNICAMP, São Paulo, Brazil.
authors.forename: P M
authors.initials: PM
authors.lastname: de Morais
authors.forename: A L
authors.initials: AL
authors.lastname: Rodrigues Júnior
authors.forename: L A
authors.initials: LA
authors.lastname: Pimenta
mesh_terms: D003723:Dental Amalgam; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003763:Dental Leakage / Q000517:prevention & control*; D003764:Dental Materials; D003793:Dental Restoration, Permanent / Q000379:methods*; D003806:Dentin Permeability / Q000187:drug effects*; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D006801:Humans; D010710:Phosphates; D011897:Random Allocation; D019279:Resin Cements; D012116:Resins, Plant; D013053:Spectrophotometry; D018709:Statistics, Nonparametric
chemical_list: D003764:Dental Materials; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D010710:Phosphates; C088835:Photac-Bond; D019279:Resin Cements; D012116:Resins, Plant; C084018:Scotchbond Multi-Purpose; C023806:Copalite; D003723:Dental Amalgam; C052304:Panavia EX