Acidic solubility of luting cements.
OBJECTIVE
Chemical disintegration of luting cements can adversely affect their long term success. The aim of the present study was to assess the susceptibility of zinc phosphate cement, glass ionomer cement and resin cement to erosion at various pH values.


METHODS
Zinc phosphate and glass ionomer cement samples were eroded in 0.3% citric acid adjusted to pH 3.0, 4.0, 5.0, 6.0 and 7.0 at a temperature of 35 degrees C. A control group was stored in saline. Profilometric readings were performed after 30 min and 1h erosion time. Resin cement samples were eroded at pH 3.0 with measurements after 30 min, 6h, 24h and 7 days. A saline control group was measured after 7 days.


RESULTS
Erosion of zinc phosphate cement was significantly higher at all pH values than erosion of glass ionomer cement with erosion depth increasing with decreasing citric acid pH. No erosion was seen in the control groups. The resin cement did not show any change in surface profile after the 7 day erosion period compared to the control group. Comparison to dental tissues revealed that erosion of glass ionomer cement in vitro was slightly lower than erosion of enamel and dentine. In contrast, erosion of zinc phosphate cement was much higher.
Eisenburger
M
M
Department of Prosthetic Dentistry, Medical University of Hanover, Carl-Neuberg Strasse 1, Hanover, Germany. m.eisenburger@gmx.de
Addy
M
M
Rossbach
A
A
D000143:Acids / Q000737:chemistry; D019343:Citric Acid / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry; D012965:Sodium Chloride; D012995:Solubility; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D015036:Zinc Phosphate Cement / Q000737:chemistry
D000143:Acids; C095997:DCR cement; D003738:Dental Cements; D005899:Glass Ionomer Cements; D019279:Resin Cements; C078532:Ketac Cem Radiopaque; D019343:Citric Acid; D012965:Sodium Chloride; D015036:Zinc Phosphate Cement