Whole genomes of Amazonian uakari monkeys reveal complex connectivity and fast differentiation driven by high environmental dynamism.

Despite showing the greatest primate diversity on the planet, genomic studies on Amazonian primates show very little representation in the literature. With 48 geolocalized high coverage whole genomes from wild uakari monkeys, we present the first population-level study on platyrrhines using whole genome data. In a very restricted range of the Amazon rainforest, eight uakari species (Cacajao genus) have been described and categorized into the bald and black uakari groups, based on phenotypic and ecological differences. Despite a slight habitat overlap, we show that posterior to their split 0.92 Mya, bald and black uakaris have remained independent, without gene flow. Nowadays, these two groups present distinct genetic diversity and group-specific variation linked to pathogens. We propose differing hydrology patterns and effectiveness of geographic barriers have modulated the intra-group connectivity and structure of bald and black uakari populations. With this work we have explored the effects of the Amazon rainforest's dynamism on wild primates' genetics and increased the representation of platyrrhine genomes, thus opening the door to future research on the complexity and diversity of primate genomics.

[Seroprevalence of Hepatitis B virus in pregnancy women at the time of delivery]. / Seroprevalencia de virus Hepatitis B en gestantes al momento del parto.

Worldwide, there is an alert due to the increase in the seroprevalence of hepatitis B virus (HBV). This can cause up to 3.5% of chronic diseases, of which 40% present secondary complications and/ or early death. OBJECTIVE: To determine the seroprevalence of HBV in pregnant women at the time of delivery. PATIENTS AND METHOD: Observational, descriptive, cross-sectional study with cross-association between 2018 and 2019 at the Hospital Carlos Van Buren (HCVB), in Valparaiso, Chile. All pregnant women admitted for delivery care or with an immediate newborn who had HBV surface antigen study were included. Data were collected from the pregnant woman (age, nationality, education level, parity, type of delivery, and peripartum HIV-syphilis serology) and the newborn (gestational age, weight, and APGAR score). Inferential and multivariate analysis was performed using the Stata software. RESULTS: 1,355 pregnant women were analyzed. 87.7% were Chilean, 5.5% Haitian, 4.2% Venezuelan, and 2.6% were of other nationalities. 0.3% were positive for HBV. The prevalence of HBV in Chileans was 0.08% and in Haitians 4%. Haitian nationality was at higher risk of HBV (OR = 83) vs. Chilean nationality (p = 0.0001). None presented coinfection with HIV and/or syphilis. CONCLUSIONS: HBV seroprevalence in HCVB pregnant women was 0.3%, similar to that described in the general population in Chile. There was no coinfection with other sexually transmitted diseases. The only predictor of HBV infection was Haitian nationality.

Concordance of the vestibular bone thickness at the level of point a between teleradiography and cone beam computed tomography / Concordancia del espesor óseo vestibular a nivel del punto a entre telerradiografía y tomografía computarizada de haz cónico

Objective: The aim of this study was to determine the concordance of the vestibular bone thickness measured at the level of point A between Teleradiography and Cone Beam Computed Tomography (CBCT). Materials and Methods: This study consisted of a cross-sectional analytical design of concordance that evaluated the teleradiographies and CBCTs of 32 patients. The measurements were performed by three evaluators, specialists in orthodontics. Two of them measured the CBCTs and one evaluated the teleradiographs. The concordance of both tests was determined using the Concordance Correlation Coefficient. Results: When evaluating the value of the vestibular bone thickness at the level of point A between the CBCT and the teleradiography, it was observed that the mean value of the absolute difference between the two was 0.95±0.74, 95%CI [0.68­1.22], being statistically significant (p=0.0027). When the concordance between both tests was analyzed, it was observed that it was poor (CCC=0.204 95%CI [0.014­0.394]), although statistically significant (p<0.00001). Conclusions: It was possible to conclude that there is no concordance in the measurement of the vestibular bone thickness at the level of Point A between the Teleradiography and the CBCT.

Objetivo: El objetivo de este estudio fue determinar la concordancia del espesor óseo vestibular medido a nivel del punto A entre la Telerradiografía y la Tomografía computarizada de haz cónico (CBCT). Materiales y Métodos: Esta investigación presentó un diseño analítico transversal de concordancia en el que se evaluaron las telerradiografías y CBCT de 32 pacientes. Las mediciones fueron realizadas por tres evaluadores especialistas en ortodoncia, dos de ellos midieron los CBCT y uno las telerradiografías. La concordancia de ambos exámenes fue medida mediante Coeficiente de Correlación de Concordancia. Resultados: Al evaluar el valor del grosor óseo vestibular a nivel del punto A entre el CBCT y la telerradiografía, se observó que el valor promedio de diferencia absoluta entre ambos fue de 0,95±0,74 IC95% [0,68­1,22], siendo estadísticamente significativas (p=0,0027). Cuando se analizó la concordancia entre ambos exámenes se observó que esta fue pobre (CCC=0,204 IC95 % [0,014­0,394]), aunque estadísticamente significativa (p<0,00001). Conclusión: Se pudo concluir que no existe concordancia en la medición del espesor óseo vestibular medido a nivel del Punto A entre la Telerradiografía y el CBCT.

Traumatismo dentoalveolar en niños y adultos del sistema de salud de la Armada de Chile, 2014-2019 / Characterization of dentoalveolar trauma in the Chilean Army population, between 2014-2019

Objetivo: Describir los casos notificados de traumatismos dentoalveolares en dientes temporales y definitivos en la Unidad Clínica de Traumatismo Dentoalveolar de la Armada de Chile en el período 2014-2019. Materiales y Métodos: Descriptivo de tipo transversal. Se incluyeron todos los casos atendidos con diagnóstico de traumatismo dentoalveolar entre 2 a 80 años en la población estudiada. Se realizó un análisis descriptivo utilizando medidas de tendencia central y un modelo de regresión logística. Resultados: Se analizó un total de 326 casos, predominando el género masculino, con una edad media de 25,4 años. El 38% correspondieron a subluxación, siendo la etiología más frecuente la caída con un 69% y el lugar de ocurrencia, el hogar con un 35,6%. La mayoría de los beneficiarios correspondieron a familiares con derecho a atención en el sistema naval, y demoraron menos de 7 días en consultar con un 54.6%. Conclusión: El tipo de traumatismo dentoalveolar más frecuente fue la subluxación. En cuanto a la etiología, destacan las caídas y golpes con objetos, en su mayoría, en el hogar, afectando principalmente a hombres menores de 30 años. El tiempo en consultar e iniciar el tratamiento correspondiente, fue dentro de 7 días.

Objective: To describe the reported cases of dentoalveolar trauma in temporary and permanent teeth in the Clinical Unit of Dentoalveolar Trauma of the Chilean Army in the period 2014-2019. Materials and Methods: Cross-sectional descriptive study. All cases attended with a diagnosis of dentoalveolar trauma between 2 and 80 years old were included in the study population. A descriptive analysis was performed using measures of central tendency and a logistic regression model. Results: A total of 326 cases were analyzed, predominantly male gender, with a mean age of 25.4 years. Thirty-eight percent corresponded to subluxation, the most frequent etiology being fall with 69% and the place of the event, home with 35.6%. Most of the beneficiaries were family members entitled to care in the army system, and took less than 7 days to come for attention with 54.6%. Conclusion: The most frequent type of dentoalveolar trauma was subluxation. As for the etiology, falls and hits with objects stand out, mostly at home, affecting mainly men under 30 years of age. The time to come for consultation and start the corresponding treatment was within 7 days.

Reproducibility of the Rocabado pain map.

OBJECTIVE: This study aimed to demonstrate the reproducibility of the Rocabado pain map (RPM) through its application by different evaluators. METHODS: Forty participants (18-45 years old) were evaluated. The examiners applied RPM by searching for painful areas, and their intensities were measured through the visual analog scale (VAS). In addition, presence and degree of joint laxity were estimated. RESULTS: Reproducibility values for antero-inferior synovial (zone 1), lateral ligament (zone 3), temporomandibular ligament (zone 4), posterior-inferior synovial (zone 5), and posterior ligament (zone 7) showed high intraclass correlation (ICC) values (above 0.7). Anterior-superior synovial (zone 2) and posterior-superior synovial (zone 6) showed ICC values above 0.4. DISCUSSION: RPM is reproducible. A "fair" concordance according to Fleiss's criteria in zone 2 (ICC 0.42) and zone 6 (ICC 0.64) might be explained by the difficulties involved in moving the condyle from the upper synovial (zones 1,5) to the lower synovial (zones 2,6).

Symmetrical activity of the chewing muscles and its relationship with skeletal class and body posture.

OBJECTIVE: To describe the role of body posture and skeletal class in the symmetrical activity of chewing muscles. METHODS: Descriptive study with association. Skeletal class measured by the Steiner method. Postural analysis through APECS mobile application for forward head posture and shoulder discrepancy, and surface electromyography with Biopac® device. RESULTS: The skeletal class, forward head posture, and shoulder discrepancy presented statistical association with the symmetrical electromyographic response of digastric muscles and masseter muscles during swallowing. DISCUSSION: This study exhibited a positive relationship between digastric muscle symmetry and skeletal class during swallowing. The compensation of the hyoid system explains these results, showing that skeletal Class III has better electromyographic balance. In contrast, masseter muscle symmetry during swallowing presented a negative relationship with skeletal class. The stabilization role that this muscle plays during swallowing explains these findings, caused by the different lengths and direction of this muscle in skeletal Class III.

Effect of Organic Modifier Types on the Physical-Mechanical Properties and Overall Migration of Post-Consumer Polypropylene/Clay Nanocomposites for Food Packaging.

The deterioration of the physical-mechanical properties and loss of the chemical safety of plastics after consumption are topics of concern for food packaging applications. Incorporating nanoclays is an alternative to improve the performance of recycled plastics. However, properties and overall migration from polymer/clay nanocomposites to food require to be evaluated case-by-case. This work aimed to investigate the effect of organic modifier types of clays on the structural, thermal and mechanical properties and the overall migration of nanocomposites based on 50/50 virgin and recycled post-consumer polypropylene blend (VPP/RPP) and organoclays for food packaging applications. The clay with the most hydrophobic organic modifier caused higher thermal stability of the nanocomposites and greater intercalation of polypropylene between clay mineral layers but increased the overall migration to a fatty food simulant. This migration value was higher from the 50/50 VPP/RPP film than from VPP. Nonetheless, clays reduced the migration and even more when the clay had greater hydrophilicity because of lower interactions between the nanocomposite and the fatty simulant. Conversely, nanocomposites and VPP/RPP control films exhibited low migration values in the acid and non-acid food simulants. Regarding tensile parameters, elongation at break values of PP film significantly increased with RPP addition, but the incorporation of organoclays reduced its ductility to values closer to the VPP.

Índice de redondez corporal como indicador antropométrico para identificar riesgo de síndrome metabólico en médicos del hospital San Francisco del IESS, en la ciudad de Quito / Body roundness index as an anthropometric indicator to identify risk of metabolic syndrome in physicians of the San Francisco hospital of the IESS, in the city of Quito

Contexto: las enfermedades crónicas no transmisibles revisten interés para la salud pública; algunas de ellas pueden detectarse y predecirse mediante estudios básicos como es la antropometría. El índice de masa corporal (IMC) valora, estratifica y clasifica el nivel de sobrepeso del individuo como factor de riesgo de síndrome metabólico (SM), sin discriminar entre masa muscular y adiposidad que puede dilucidarse mediante el índice de redondez corporal (IRC) y predecir tanto el porcentaje de grasa corporal y el estado de salud. Barazzoni y colaboradores relacionaron tanto al IRC e IMC con el síndrome metabólico; sobre esta relación existen contados estudios, algunos controversiales. Objetivo: demostrar la utilidad del IRC para identificar factores de riesgo de síndrome metabólico y correlacionarlo con el Índice de masa corporal para establecer la utilidad clínica como indicador de riesgo metabólico. Sujetos y métodos: estudio epidemiológico observacional descriptivo transversal de con- junto, en una muestra de 90 médicos del Hospital San Francisco de Quito. Perteneciente al Instituto Ecuatoriano de Seguridad Social. Mediciones principales: estado nutricional según peso, talla, circunferencia abdominal; diagnóstico de síndrome metabólico según «guía para el tratamiento de dislipidemias en adultos¼ (Adult Treatment Panel III). Resultados: el 16,67% (IC95% 10,37­25,69%) de sujetos fueron diagnosticados con SM de- mostrándose similar resultado usando IMC e IRC para establecer la condición de SM según criterios diagnósticos del ATPIII (p<0,05). La exactitud del IMC como predictor de riesgo de SM fue 62% y 30% de precisión; para IRC, la exactitud fue 42%, sensibilidad del 23% y 100% de valor predictivo negativo. Conclusión: la prevalencia de síndrome metabólico en médicos es alta. El IRC es útil para el diagnóstico de SM, sin embargo, su mayor aplicación es para descartar su diagnóstico, comparado con el IMC. Se recomienda nuevos estudios.

Contex: Chronic non-communicable diseases are of interest to public health; some of them can be detected and predicted through basic studies such as anthropometry. The body mass index (BMI) assesses, stratifies and classifies the individual's level of overweight as a risk factor for metabolic syndrome (MS), without discriminating between muscle mass and adiposi- ty that can be elucidated by means of the body roundness index (BRI) and predict both body fat percentage and health status. Barazzoni and collaborators related both IRC and BRI with metabolic syndrome; about this relationship there are few studies, some controversial. Objective: to demonstrate the usefulness of the BRI to identify risk factors for metabolic syndrome and correlate it with the body mass index to establish clinical utility as an indica tor of metabolic risk. Subjects and methods: Cross-sectional descriptive observational epidemiological study, in a sample of 90 doctors from the San Francisco Hostpital of Quito (Ecuadorian Social Security Institute). Main measurements: nutritional status according to weight, height, abdominal circumference; diagnosis of metabolic syndrome according to "guide for the treatment of dyslipidemias in adults" (Adult Treatment Panel III). Results: 16.67% (95% CI 10.37­25.69%) of subjects were diagnosed with MS demonstrating a similar result using BMI and BRI to establish the condition of MS according to diagnostic criteria of ATPIII (p <0.05). The accuracy of the BMI as a predictor of MS risk was 62% and 30% accuracy; for IRC, the accuracy was 42%, sensitivity 23% and 100% negative predictive value. Conclusions: The prevalence of metabolic syndrome in doctors is high. The BRI is useful for the diagnosis of MS, however, its greatest application is to rule out its diagnosis, compared to the BMI. New studies are recommended.

Temperature modulates Fischerella thermalis ecotypes in Porcelana Hot Spring.

In the Porcelana Hot Spring (Northern Patagonia), true-branching cyanobacteria are the dominant primary producers in microbial mats, and they are mainly responsible for carbon and nitrogen fixation. However, little is known about their metabolic and genomic adaptations at high temperatures. Therefore, in this study, a total of 81 Fischerella thermalis strains (also known as Mastigocladus laminosus) were isolated from mat samples in a thermal gradient between 61-46°C. The complementary use of proteomic comparisons from these strains, and comparative genomics of F. thermalis pangenomes, suggested that at least two different ecotypes were present within these populations. MALDI-TOF MS analysis separated the strains into three clusters; two with strains obtained from mats within the upper temperature range (61 and 54°C), and a third obtained from mats within the lower temperature range (51 and 46°C). Both groups possessed different but synonymous nifH alleles. The main proteomic differences were associated with the abundance of photosynthesis-related proteins. Three F. thermalis metagenome assembled genomes (MAGs) were described from 66, 58 and 48°C metagenomes. These pangenomes indicated a divergence of orthologous genes and a high abundance of exclusive genes at 66°C. These results improved the current understanding of thermal adaptation of F. thermalis and the evolution of these thermophilic cyanobacterial species.

Transcultural adaptation of the WHO oral health questionnaire and its validation in chilean children

Introduction: the last edition of the WHO "oral health questionnaire for children" was published in 2013. this is an only-english version, and as such it requires linguistic adaptation and validation to be applied in the chilean population. objectives: to translate and adapt the WHO oral health questionnaire for children to spanish and validate it in a chilean population. methods: a translation and back translation of the original instrument from english to spanish was carried out by four translators. the questionnaire was self-reported as a pilot test in ten individuals. a sample was subsequently selected for convenience taking into account the population distribution, resulting in a final sample of 103 individuals. the internal consistency was calculated with Cronbach's alpha, criterion validity with Pearson's correlation coefficient and construct validity with exploratory factor analysis. results: a conceptual and semantic equivalence of the instrument was obtained. women and men accounted for 43.69 percent and 56.31 percent of the sample, respectively. Cronbach's alpha coefficient was 0.62, while criterion validity was slightly positive between the total dimensions and the DMFT (r=0.13, p-value= 0.20). the exploratory factor analysis yielded a total of 11 factors that explain 70 percent of the variability in the data. conclusions: the oral health questionnaire has been appropriately adapted to spanish, having conceptual as well as semantic equivalence to the original version, being reliable and valid to be used in a population of 12-year-old chilean children.

Prevalencia de Anomalías Dentomaxilares y Necesidad de Tratamiento en Adolescentes / Prevalence of Dentomaxillary Anomalies and Treatment Needs in Adolescents

RESUMEN: Las anomalías dentomaxilares (ADM) constituyen un problema de salud pública en Chile, lo que genera la necesidad de un diagnóstico sistemático y la asignación de prioridades de tratamiento. Las ADM que afectan la estética pueden constituir una barrera para la inserción social de los adolescentes. El Dental Aesthetic Index (IED), es un instrumento que permite jerarquizar la necesidad de tratamiento de las ADM. El propósito de esta investigación fue caracterizar las ADM, necesidad de tratamiento a través de IED y auto-percepción estética en escolares de 12 a 15 años. Estudio de Prevalencia en adolescentes de 12 a 15 años, de la ciudad de Viña del Mar. El criterio de exclusión fue tratamiento ortodóncico previo. Se seleccionaron 204 sujetos mediante asignación uniforme con un nivel de confianza de 95 %. Variables recogidas: Edad, tipo de establecimiento educacional, sexo, percepción estética y IED por componentes. La prevalencia según IED fue de 63 % [56 % - 70 %]. La necesidad de tratamiento fue 44,2 % electivo, 31,01 % altamente deseable y 24,81 % obligatorio y prioritario. El IED Comunitario dio 29.5. Se encontró una relación significativa entre IED y percepción estética con un p-valor: 0,006 (Rho: 0,343). La prevalencia de anomalías dentomaxilares medido a través del indicador IED alcanza el 63 % y el IED comunitario de 29,54 % afirmando que el grupo "requiere tratamiento electivo por ADM definida"; en los establecimientos particulares está subestimado pues algunos casos ya han sido tratados con anterioridad a esta investigación.

ABSTRACT: Dentomaxillary anomalies are a public health problem in Chile, resulting in the need for screening and prioritization of treatment. Dentomaxillary anomalies affecting the aesthetics can be a barrier to social integration of adolescents. The Dental Aesthetic Index (DAI) is an instrument to prioritize the need for treatment of malocclusions. The purpose of this research was to characterize the malocclusions, orthodontic treatment needs and esthetic self-perception in schoolchildren from 12 to 15 years through DAI. Prevalence Study in 12 to 15 year-old adolescents from Viña del Mar. The exclusion criteria was previous orthodontic treatment. The sample was 204 subjects selected by uniform allocation with a confidence level of 95 %. Variables included age, type of educational establishment, sex, aesthetic perception and DAI by component. Prevalence of dentomaxillary anomalies by DAI was 63 % [56 % - 70 %], Treatment needs were 44.2 % treatment elective, 31.01 % highly desirable and 24.81 % mandatory. The Community's DAI was 29.5. The relationship between DAI and aesthetic perception was significant (p-value: 0.006; Rho: 0.343). The prevalence of dento-maxillary anomalies measured by DAI reaches 63 % and the communal DAI was 29.54 stating that the group "requires elective treatment for definite malocclusion"; in private schools, it is underestimated because some cases had already been treated prior to this investigation.

Valparaiso's 2014 Fire: Evaluation of Environmental and Epidemiological Risk Factors During the Emergency Through a Crowdsourcing Tool.

OBJECTIVE: To describe and relate the main environmental risk factors in the emergency process after a large urban fire in Valparaiso, Chile, in April 2014. METHODS: An observational, cross-sectional descriptive study was performed. All 243 reports from an ad hoc web/mobile website created on the Ushahidi/Crowdmap platform were reviewed. Reports were recorded in a new database with dichotomist variables based on either the presence or absence of the relevant category in each report. RESULTS: Almost one-third of the reports presented data about garbage (30%) and chemical toilets (29%). Reports related to water, infrastructural damage, and garbage had significant associations with 4 categories by chi-square test. In the logistic regression model for chemical toilets, only the variable of water was significant (P value=0.00; model P value: 0.00; R2: 11.7%). The "garbage" category confirmed infrastructural damage (P value: 0.00), water (P value: 0.028), and vectors (P value: 0.00) as predictors (model P value: 0.00; R2: 23.09%). CONCLUSIONS: Statistically significant evidence was found for the statistical dependence of 7 out of 10 studied variables. The most frequent environmental risk factors in the reports were garbage, chemical toilets, and donation centers. The highest correlation found was for damaged infrastructure, vectors, and garbage. (Disaster Med Public Health Preparedness. 2017;11:239-243).

Discursos de la vulnerabilidad bajo el gerenciamiento educativo: Análisis Ley de subvención escolar preferencial chilena

En el presente artículo indagamos cómo las nociones de vulnerabilidad escolar y gerenciamiento educativo se han instalado discursivamente en el campo legislativo de la educación chilena. La incorporación de estos elementos ha implicado una transformación profunda en la escuela, en donde la lógica de la rendición de cuentas convive con el ideario de la igualdad de oportunidades. Sobre la base de la estrategia discursiva de los repertorios interpretativos (Pottery Wetherell, 1987), se analiza las funciones que el estudiante vulnerable o "prioritario" juega en el corpus textual de la Ley 22.248 de Subvención Escolar Preferencial. Los resultados muestran tres tipos de repertorios interpretativos: a) El de la igualdad de oportunidades, b) El técnico y c) El del management. Por último, se discute las implicancias del concepto de vulnerabilidad, especialmente en lo respectivo a las distintas lógicas presentes para abordarlo, en un contexto de mercantilización y de políticas de gerenciamiento en educación.

The present study investigates, through discourse analysis, how the notions of school vulnerability and educational management have been established in the Chilean education legislation. The incorporation of these elements has implied a profound transformation on schools, where the accountability logic coexists with an equality of opportunities value. Based on the interpretative repertoires approach (Potter y Wetherell, 1987), we analyzed the functions that a vulnerable or "critical” student plays in the text corpus of the 20.248 Preferential School Subsidy law. This analysis yielded three kinds of interpretative repertories: a) Equally of Opportunities, b) Technical, and c) Management. Results are discussed in terms of the implications of the vulnerability concept, especially regarding the different logics available in a context of commercialization and education management policies.

Neste artigo, investigamos como as noções de vulnerabilidade escolar e gerenciamento educacional foram instaladas de forma discursiva no campo legislativo da educação chilena. A incorporação desses elementos envolveu uma profunda transformação na escola, onde a lógica da responsabilidade coexiste com a idéia de igualdade de oportunidades. Com base na estratégia discursiva dos repertórios interpretativos (Potter e Wetherell, 1987), são analisadas as funções que o aluno vulnerável ou "priorizado" desempenha no corpus textual da Lei 22.248 da Lei Preferencial de Bolsas Escolares. Os resultados mostram três tipos de repertórios interpretativos: a) O de igualdade de oportunidades, b) O técnico e c) O da gestão. Finalmente, são discutidas as implicações do conceito de vulnerabilidade, especialmente no que diz respeito às diferentes lógicas presentes para abordálo, em um contexto de comercialização e políticas de gestão na educação.

Salud Oral en Población Escolar Urbana y Rural / Oral Health in Urban and Rural School Population

La salud oral, está condicionada tanto por factores locales individuales como por factores socioeconómicos, culturales, ambientales, comunitarios y geográficos, entre estos últimos la condición urbano-rural cumple un rol importante. En un esfuerzo de vigilancia epidemiológica; se realizó el primer estudio en la zona que se fija como propósito comparar la salud oral en niños de 6 a 12 años de zonas rurales y urbanas, mediante indicadores de caries, estado de la salud periodontal y presencia de anomalías dentomaxilares. Estudio de prevalencia en escolares entre 6 y 12 años de zonas urbana y rural de la Región de Valparaíso. La muestra correspondió a 231 niños que presentaron dentición mixta o permanente. Las variables recogidas fueron edad, sexo, localidad, presencia de alteraciones mucosas, dentomaxilares y periodontales; índices ceod, COPD, índice de higiene oral; presencia de sellantes y necesidad de tratamiento; nivel educacional de jefe de hogar, del encargado del niño y situación laboral del jefe de hogar. La base de datos se analizó mediante Microsoft Excel y Stata 13.0. Se realizó estadística descriptiva e inferencial bivariante y multivariante. La presencia de caries, gingivitis generalizada y alteraciones mucosas fueron significativamente mayores en sector rural, al igual que la necesidad de tratamiento de anomalías dentomaxilares, restauraciones y caries. Los promedios de ceod y COPD fueron mayores en sector rural que urbano, con diferencias estadísticamente significativas. A través de un modelo lineal se observó que variables como educación del jefe de hogar y encargado del niño y situación laboral del jefe de hogar no resultaron significativas al intentar explicar la variabilidad de COPD y ceod, pero sí la localidad. La salud oral presentó mayor daño en niños de sector rural constituyéndose en factor de riesgo para caries, daño periodontal, anomalías dentomaxilares, y menor acceso a los servicios de salud.

Oral health is conditioned by individual local factors and also by socioeconomic, cultural, environmental, community, geographical factors where living in rural or urban areas plays an important role. It is an effort of epidemiological surveillance; the first study in this area that aimed to compare oral health in children aged 6-12 years old in rural and urban locations, using as indicators the presence of caries, periodontal health status and presence of dento-maxillary anomalies. Prevalence study in school population of children aged 6-12 years old from urban and rural locations of Valparaiso Region. The study sample was taken from 231 children who had mixed or permanent dentition. The variables measured were: age, gender, location, presence of mucosa, periodontal and dento maxillary anomalies; dmft/DMFT index, oral hygiene index; presence of sealants and need of treatment; educational level of household head and child caregiver and the employment/ unemployment situation of the household head. The database was analyzed using Microsoft Excel and Stata 13.0. Descriptive statistics and bivariate multivariate inferential statistics were performed. The presence of caries, generalized gingivitis and mucosa lesions were significantly higher in rural areas, as well as, the need of treatment of dento maxillary anomalies, restorations and caries. The average dmft and DMFT index were higher in rural than urban, with significant difference. Through linear model variables such as education of the household head and child caregiver the employment/ unemployment situation of the household head were not significant when trying to explain the variability of DMFT and dmft index, but living in urban or rural areas was an important factor. Oral Health was worse in children from rural areas and constitutes a risk factor for dental caries, periodontal damage, dento maxillary anomalies and less access to health services.