دانلود رایگان مقاله انگلیسی درباره تحلیل عاملی ایمپلنت های دندانی - الزویر 2018

ABSTRACT

In this paper we present the first results of a broad research line aiming a better understanding about dental implants as the number of procedures, successes and failures in Brazil and possible reasons of losses (from problems on diagnose to fabrication defects from different brands offered in the Brazilian market). One thing that is already evident is the lack of details of the performed elemental analysis of implants, not only in Brazil but also on the majority of reported analyses published on international journals dedicated to the field. There are already a significant number of reports about the composition of dental implants and its surfaces, but in general they have not performed tests enough to validate the results nor reported the procedure with sufficient details establishing their comprehensiveness, which is critical to enable a comparison between those results. One detected problem is the using of a non standard geometry in some equipment that require special shapes or dimension for the analysis. The other is the determination of the uncertainties to be associated to the results. Here we will perform a brief review of the dental implant history, of some problems found in the elemental analysis and will present two sets of measurements, one to investigate the consequences of using nonstandard geometries and another comparing elemental analyses made with different instruments.

CONCLUSION

The results have demonstrated the elemental analysis, particularly of dental implants, depends on the technique, meaning the radiation and energy chosen as well as the selected region of interest on the sample. For surface layers, the most important region for dental implants, electron microscope coupled to EDS analysis is a suitable technique but requires some attention specially when evaluating the uncertainty, avoiding to just use the statistical one provided by the equipment, and verifying the reproducibility. Using a second method as WDS, on the other hand, allows analyzing a deeper layer of the sample. But in this case special attention to the sample geometry should be paid. The combination of both methods allows a more complete evaluation of the dental implant: the surface layer, showing the oxidation and/or coating properties as well as the characteristics of the titanium core used for the implant. The next step of our study is to analyze the temporal evolution of the surface layer when exposed to the atmosphere. And then to test different brands offered in the Brazilian market.