Objective:

The purpose of this study was to develop a polycar-boxylate cement through the neutralization reaction of poli (acryl ic acid) with cobalt fluorides in presence of metallic oxides.

Materials and methods:

Acrylic acid (J.T. Baker), ammonium persulfate (J.T. Baker), isopropilic alcohol (J.T. Baker) and deionized water were used to obtain poly (acrylic acid) (PAA). The reactives were placed in a glass reactor (70 °C ± 5 °C) with constant stirring in nitrogen atmosphere; molecular weights were calculated through relative viscosity determinations. The PAA, cobalt fluoride III (CoF3) (J.T. Baker), cobalt fluoride II (CoF2) (Al-drich) and filling material sintetized in Dental Materials Laboratory (DEPeI, F.O. UNAM) were used to prepare the cobalt polycar-boxilate. Working and setting time, compressive strength and acid erosion were measured according to 96 ADA.

Results:

PAA viscosity molecular weights were 40,000 and 8,000 g/mol. One way ANOVA showed significant differences (p < 0.001) and Tukey test (p < 0.05) in working and setting time, compressive strength and acid erosion.

Conclusions:

The closest values to the established on the specification were obtained by PAA 40,000 g/mol, CoF2 and filling material sintetized.

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