Dentine and enamel bonding agents.
Previous studies have shown that sequential use of aqueous FO (ferric oxalate containing a small concentration of HNO3), acetone solutions of NPG (N-phenylglycine), and PMDM (the reaction product of pyromellitic dianhydride and 2-hydroxyethylmethacrylate) yields strong adhesive bonding of composite resins to both dentine and enamel. The purpose of this study was to determine if aluminum ions could be substituted for ferric ions and if the procedure could be simplified. Aqueous solutions containing aluminum oxalate and aluminum nitrate, followed in sequence by acetone solutions of NPG and PMDM, gave strong tensile adhesive bond strengths between a composite and extracted human teeth. Comparable values have been obtained with FO, NPG and PMDM. Aluminum oxalate solutions containing no nitrate gave lower bond strengths, as was the case with FO. Aqueous solutions of acidified aluminum oxalate can dissolve NPG, thereby allowing a simplification of the procedure. Tested for comparison, commercially available dentine bonding agents gave lower average bond strengths on dentine than did some of the experimental materials.
Bowen
R L
RL
Paffenbarger Research Centre, National Bureau of Standards, Gaithersburg, Maryland 20899.
Tung
M S
MS
Blosser
R L
RL
Asmussen
E
E
D000535:Aluminum; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel; D003804:Dentin; D006801:Humans; D010070:Oxalates; D019815:Oxalic Acid; D012996:Solutions
D003188:Composite Resins; D010070:Oxalates; D012996:Solutions; D019815:Oxalic Acid; D000535:Aluminum