Browsing by Subject "Ozone"

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    Ozone in patients with periodontitis: a clinical and microbiological study
    (MDPI, 2022-05-23) Ramírez Peña, Ana María; Sánchez Pérez, Arturo Joaquín; Campos Aranda, Matilde; Hidalgo Tallón, Francisco Javier; Dermatología, Estomatología, Radiología y Medicina Física
    The purpose of this article was to assess the effectiveness of ozone therapy as an adjunct to mechanical therapy in periodontitis patients. Thirty-two patients diagnosed with generalized periodontitis were selected, with a total of 655 teeth examined. Each patient’s mouth was divided into four quadrants (the split-mouth model) to be randomly treated with four sessions of gaseous ozone or air. The following clinical variables were recorded: the gingival index, the periodontal clinical attachment loss, the Miller’s mobility index and the clinical improvements, as assessed through the visual analog scale (VAS). In addition, the microorganisms were qualitatively compared. After four weeks of treatment, the teeth of the ozone-treated quadrants showed statistically significant reductions in the gingival index and an improvement in the clinical attachment (p < 0.0001). The same treatment also significantly improved mobility by between 70% and 86% compared to the control group (p < 0.0001). Statistically significant differences were also recorded for the VAS (p < 0.0001). In the qualitative study of the subgingival flora, significant differences were observed (p < 0.0001). The overall results of this trial support the view that ozone treatment is effective and well tolerated in cases of generalized chronic periodontitis.
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    Study of the uncertainty in NO2 chemiluminescence measurements due to the NO–O3 reaction in sampling lines
    (Springer, 2011-03) Doval Miñarro, Marta; González Ferradás, Enrique; Barberá Rico, Jonathan; Díaz Alonso, Fernando; Marzal Martínez, Francisco J.; Romero Trigueros, Cristina; Ingeniería Química
    Introduction The change in light intensity that takes place when an ambient air sample is drawn into the detection chamber of a chemiluminescence monitor generates changes in the concentrations of several species, such as NO2, NO and O3. Although this phenomenon has been known for several decades, there is still no commonly accepted approach on when or how to correct for it in NO2 and O3 readings. Discussion In this work, we have assessed the expanded uncertainty of two chemiluminescence NO x analysers commercially available according to EN 14211:2005, with the aim of establishing the maximum allowable standard uncertainty due to the reaction between NO and O3 in the sampling system. Conclusion Although this maximum allowable uncertainty cannot be a universal value—as it will depend on the performance of each analyser—our results have led us to propose the conservative value of 2%. We have also proposed a methodology for improving data quality which could be easily implemented by those responsible for air quality data validation.