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Órgano oficial de la Facultad de Odontología, UNAM

2009, Number 2

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Rev Odont Mex 2009; 13 (2)

Characterization of a new polycarboxylate as an alternative to use as dental cement

López VD, Álvarez GC, Ramírez OP

Language: Spanish
References: 13
Page: 73-78
PDF size: 164.34 Kb.


ABSTRACT

Objective: The purpose of this study was to develop a polycarboxylate cement through the neutralization reaction of poli (acrylic 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) (Aldrich) and filling material sintetized in Dental Materials Laboratory (DEPeI, F.O. UNAM) were used to prepare the cobalt polycarboxilate. 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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