RESUMEN
These tests showed that DMBA, a recently commercialized amine accelerator, is more suitable from the standpoint of color for use in denture base, reline, and repair resins than is the commercially used amine, DMPT. As the curing times of all specimens were approximately the same, the mechanical properties are expected to be similar for the following reasons. Previous experiments have shown that in the same composite formulation, equimolar concentration of DMPT and DMBA produce identical hardening times. A more recent investigation with composite systems indicates that amines yielding comparable polymerization rates produce materials with approximately the same mechanical strength; the same is expected to prevail with unreinforced methacrylate polymers. All specimen disks provided similar resistance to bending by hand.
Asunto(s)
Metilmetacrilatos , Toluidinas , Fenómenos Químicos , Química Física , Color , Bases para Dentadura , DurezaRESUMEN
The overall characteristics of the composites cured with a number of newly synthesized, tertiary aromatic amines compare favorably to those of resins polymerized with commonly used accelerators. Maximum compressive and tensile strength for the composites are obtained only over a narrow concentration range of accelerator used.
Asunto(s)
Aminas , Resinas Compuestas , Materiales Biocompatibles , Fenómenos Químicos , Química Física , Color , Restauración Dental Permanente , Estrés Mecánico , Resistencia a la Tracción , Factores de Tiempo , AguaRESUMEN
Yellow mixtures form on adding essentially colorless N,N-dimethyl-p-toluidine (DMPT) to colorless methacrylate monomers containing phthalate, isophthalate, or terephthalate diester groups. The color-causing interactions between the amines and monomers were investigated using ultraviolet spectroscopy. Equations were derived from predicting interactions between formulation ingredients and DMPT that would lead to undesired color.