Abstract

ZELADA LADRON DE GUEVARA, Cinthya Cecilia et al. Adaptation of unit coping Co-Cr elaborated with diferent manufacturing techniques and two finishing lines. Rev. Estomatol. Herediana [online]. 2018, vol.28, n.1, pp.7-19. ISSN 1019-4355.  http://dx.doi.org/https://doi.org/10.20453/reh.v28i1.3278.

New technologies have allowed us to migrate from the spin-wax casting technique (CPC) to additive manufacturing such as selective laser fusion (SLM), providing a better marginal and internal adaptation. Objectives: To compare the marginal and internal discrepancies in Co-Cr unit metal copings on two termination lines: chamfer and bevel, made with CPC and SLM, determining which technique had the best marginal and internal adaptation. Material and Methods: We had 4 study groups: CPC chamfer (n=13), CPC bevel (n=13), SLM chamfer (n=13), SLM bevel (n=13). To assess marginal and internal discrepancies, the silicone replica technique was used, a first sectioning was performed in the vestibular-palatine (V-P) and a secondin the mesio-distal (M-D) direction. The cervical, axial and occlusal zones were measured in a stereomicroscope at 40X. Results: Normality assumptions were evaluated with the Shapiro-Wilk test. Statistical analyzes were Student’s t test and U Mann-Whitney test. The less discrepancy marginal was for the SLM chamfer with mean values less than 24.70±10.29 μm in the V-P cut and 21.82±5.94 μm in the M-D cut, followed by the SLM bevel in the P-V cut of 34.12±16.23 μm and in the cut M-D of 35.34±8.91 μm. The CPC bevel in the V-P cut was 27.17±21.11 μm and in the M-D cut of 47.91±16.77 μm and for the CPC chamfer in the V-P cut was 89.65±58.39 μm and in the M-D cut of 91.72±67.13 μm; the difference was statistically significant only for SLM chamfer copings compared to the CPC chamfer. In the internal discrepancy values, no statistical differences were found among the 4 groups. Conclusions: Accord- ing to the descriptive values the best marginal fit was achieved with the SLM chamfer, followed by the SLM bevel, CPC bevel and CPC chamfer. Regarding internal adaptation, the descriptive values were not conclusive enough to decide which technique was better, but a better adaptation was achieved in the axial zone than in the occlusal zone.

Keywords : Crowns; adaptation; lasers solid-state.

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