Abstract

PANTOJA BORJA, Pedro Estephano; GELDRES ECHEVERRA­A, Graciela María Dolores; CASTILLO ANDAMAYO, Diana Esmeralda  and  QUINTANA DEL SOLAR, Martín Gilberto. Fit of Cobalt-Chromium alloy copings fabricated with two casting techniques on two termination lines. Rev. Estomatol. Herediana [online]. 2019, vol.29, n.2, pp.115-127. ISSN 1019-4355.  http://dx.doi.org/https://doi.org/10.20453/reh.v29i2.3528.

The techniques of lost wax cast by conventional centrifugation are current techniques to obtain Cobalt-Chrome (Co-Cr) copings for metalceramic crowns. Objective: Evaluate in vitro, the marginal and internal adaptation in unitary Co-Cr alloy copes, made on two termination lines: chamfer and bevel, manufactured with the techniques of lost wax cast by conventional centrifugation (CPCC) and by induction (CPCI), according to type of cut, area and measurement points. Materials and methods: The marginal and internal adaptation of 13 co-units of Co-Cr alloy for each technique and termination line was evaluated. The silicone replication technique was used. The samples were divided in the vestibulo-palatal direction and in the mesio-distal direction, observed in a stereomicroscope at a 40X magnification and the cervical, axial and occlusal areas were evaluated. Results: Statistical analyzes included the Student’s t-test and U Mann-Whitney, previously the assumptions of normality were evaluated with the Shapiro-Wilk test to analyze statistically significant differences between the groups (p <0.05). The marginal discrepancy was less than 120 µm and the internal discrepancy less than 350µm. Conclusion: The results in the marginal and internal adaptation of copings with chamfer termination lines and bevel fabricated with the techniques of lost wax cast by conventional centrifugation and induction were not conclusive to determine which technique is the best since in most of the points evaluated there was not a statistically significant difference. Also in the two lines of termination cnamfer and bevel, there were found clinical acceptable ranges.

Keywords : Adaptation; chromium alloys; waxes.

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