Abstract
Aim The purpose of this study was to evaluate the MD (marginal discrepancy) on the calcinable copings in abutments for cemented prostheses with three luting agents. Methods Sixty-four analogs of CeraOne-type abutments (NACONIH code, Titanium Fix Implant Sytem SP, Brazil) were divided into four groups (n = 16). The copings were cast and placed on the CeraOne abutment analogs and cemented with eugenol-free zinc oxide (EfZO) (n = 16), with glass ionomer (GI) (n = 16), and with zinc phosphate (ZP) (n = 16), and as a control group, there were CeraOne plastic copings (NACOC code, Titanium Fix Implant Sytem SP, Brazil) (n = 16) which were not cemented with any material. After 24 hours, the MD of the four groups was measured. MD was evaluated using a stereoscopic microscope (Leica EZ4 W, Leica Microsystems, Germany) with an increase of ×100. MD was measured at four predetermined and equidistant sites with respect to the marginal line of the cast adaptation. The measurement was made from the distance between the free edge of the cast cylinder and the margin of preparation of the titanium abutment, with a level of statistical significance of p < 0.05. Results Of the three fixing agents, the ZP was found to have the highest MD (53.59 ± 14.21 μm); however, the lowest MD (41.72 ± 9.10 μm) was found in the GI group. These differences are statistically significant at p < 0.001. Conclusions In summary, according to our results, it was found that ZP cement showed the highest MD after cementation, followed by the glass ionomer, while EfZO showed the lowest MD.
Highlights
One of the most significant prerequisites for the long-term success of implant-supported prostheses lies on retention, resistance, and marginal sealing evaluation
Cast copings with CeraOne abutment analogs were cemented with eugenol-free zinc oxide (EfZO) (n 16), with glass ionomer (GI) (n 16), and with zinc phosphate (ZP) (n 16)
CeraOne abutment analogs were used. e metal caps were cast with a metal alloy Co-Cr (Metalloy CC Germany). e castings were sprayed with a 5 mm diameter wax wire and invested in phosphate-bonded investment
Summary
One of the most significant prerequisites for the long-term success of implant-supported prostheses lies on retention, resistance, and marginal sealing evaluation. E greater the gap between the restoration and the prosthetic abutment, the greater the dissolution and plaque adhesion, resulting in the growth of an inflammatory lesion in the mucosa next to the dental implant [8]. This would result in a greater crestal bone resorption [9]. Accuracy of fit has a considerable effect on the clinical success of the cement-retained implant prostheses [10], to date no studies are available with regard to the marginal fit using different luting agents. E purpose of this study was to evaluate the MD on cast copings fit over abutments cemented with three luting agents to reject the null hypothesis that refers to the fact that there is no statistical difference between the MD that occurs when using these cements
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