Abstract The aim of this systematic review was to evaluate the methodological quality and the consistency of recommendations of clinical practice guidelines (CPGs) in Periodontology. An electronic search was conducted in two databases, MEDLINE and EMBASE, eight CPGs databases, and home pages of scientific societies in Periodontology up to April 2022. Three reviewers independently assessed methodological quality using the AGREE II instrument. In addition, we evaluated the consistency of the recommendations. Eleven CPGs were included, and the topics developed focused on prevention, diagnosis, risk factors, surgical and non-surgical periodontal treatment, antimicrobial therapy, root coverage, and maintenance. We found that the AGREE domains 2 (Stakeholder involvement) and 5 (Applicability) obtained the lowest scores. Domains 1 (Scope and purpose), 3 (Rigor of development) and 4 (Clarity of presentation) obtained the highest scores among the evaluated CPGs. The clinical recommendations for treatment of periodontal diseases were mostly consistent. Overall, the quality of CPGs used in periodontics was high. There was consistency of recommendations in specific fields. These findings may help researchers to promote CPGs focused on different fields of periodontics that have not yet been developed. Furthermore, the clinician will be able to make better clinical decisions.

Abstract Soil ecosystem provides fundamental services as bio-geochemical cycle regulation. Nitrogen cycle is managed by the microbiota that it harbors and depends on the stability of the ecosystem to cope abiotic disturbances such as metal and metalloid contamination. High concentrations of nickel (Ni) and zinc (Zn) in agricultural soils are frequently related to the application of conventional farming practices, composting, irrigation and biosolids deposit, as well as wastewater polluted from the mining and thermoelectric industry. To better understand the effects of this kind of abiotic disturbance a microcosm, this study was performed with agricultural soil from the Coast of Hermosillo, Sonora, Mexico and contaminated with Ni (II) and Zn (II) salphen complexes to evaluate their effect on the system, regarding the nitrogen cycle fluxes over time. The results obtained by spectrophotometric analyzes of the inorganic nitrogen pool, atomic absorption and pH revealed that the soil system functioning based on the nitrogen cycle was recovered 240 days after disturbances with M-salphen. This suggest the potential use of NiSB15 as a promoter to increase nitrate concentration at 60 days in conjunction with NiSA15 to increase ammonium concentration in agricultural soils contaminated with heavy metals.

Resumen El suelo proporciona servicios ecosistémicos fundamentales como la regulación del ciclo del nitrógeno, el cual, es dirigido por la microbiota que éste alberga y su estabilidad depende de perturbaciones bióticas o abióticas, como la contaminación por metales. Altas concentraciones de níquel (Ni) y zinc (Zn) en suelos agrícolas están relacionadas con prácticas agrícolas convencionales, composta, biosólidos, así como el riego con agua contaminada proveniente de la industria minera y termoeléctrica, principalmente. Con el objetivo de estudiar los efectos de dicha perturbación abiótica, se realizó un estudio a nivel microcosmos con suelo agrícola proveniente de la Costa de Hermosillo, Sonora, México, perturbado con compuestos M-salfen de Ni(II) y Zn(II), para evaluar su efecto en el funcionamiento del ciclo del nitrógeno a lo largo del tiempo. Los resultados obtenidos de los análisis espectrofotométricos de la reserva de nitrógeno inorgánico, de absorción atómica y de pH revelaron la recuperación de la funcionalidad del ciclo del nitrógeno en 240 días posteriores a las perturbaciones con M-salfen aplicadas, sugiriendo que, la utilización de NiSB15 promueve el incremento de la concentración de nitrato a los 60 días y, en conjunción con NiSA15 aumenta la concentración de amonio en suelos agrícolas contaminados con metales pesados.