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Dentin-bonding Molar Efficiency Using N-Phenylglycine, N-Phenyl-beta-Alanine, or N-Methyl-N-Phenylglycine

Naval Dental School, NNDC, Bethesda, Maryland 20814-5077

A.D. Johnston

Paffenbarger Research Center, American Dental Association, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

Three structurally related substituted amino acids (N-compounds) were studied in a three-step dentin-bonding protocol. The first step of an acidic ferric oxalate solution and the third step of a surface-active comonomer were held constant throughout the study. In the second step, the amount of the N-compound-either N-phenylglycine (NPG), N-methyl-N-phenylglycine (NMNPG), or N-phenyl-p-alanine (NPBA)-was varied in acetone from 0 mol/L through 5 x 10-1 mol/L in seven steps. At 1 x 10-3 mol/L for NPG and NMNPG, average bond strength values were 7.4 ± 2.2 and 10.5 ± 2.7 MPa. The highest bond strength value for NMNPG was at 1 x 10-2 mol/L, with 13.2 ± 4.0 MPa. The highest value for NPG was at 1 x 10-1 mol/L, with a value of 11.8 ± 2.5 MPa. The average bond strength for NPBA did not differ from zero across the entire range of concentrations. Molar efficiency was defined as the bond strength per mole of these applied N-compounds. For the two N-compounds that did provide adhesion to dentin, NPG and NMNPG, the average bond strengths rose, peaked, and fell as the amounts of applied N-compound were increased. The molar efficiency dropped off as the concentration of applied N-compound rose. The least operator-sensitive and most efficient N-compound, NMNPG, delivered a bond strength equivalent to that of NPG, with 10% of the applied NPG amount.

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Journal of Dental Research, Vol. 70, No. 3, 211-214 (1991)
DOI: 10.1177/00220345910700031101


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