Oral health situation of Chilean preschool children in the years 2007-2015: systematic review and analysis at individual level.

Introduction: Oral diseases are a worldwide public health problem in need of constant evaluation and follow-up. Aim: To analyze Chilean preschoolers’ oral indicators by age, sex, socioeconomic status urban/rural location their school. Material Methods: Systematic review conducted PubMed, EMBASE, Scielo gray literature to identify epidemiological studies Chile. We included with regional representativeness, published until May 2021. requested the studies’ datasets (individual data) reanalysis for six indicators: prevalence untreated caries, caries experience, gingivitis, malocclusions dmft/DMFT. Sex, school (SES) were considered as exposure variables. assessed risk bias each study synthesized results them. Differences between indicator explanatory variables analyzed through Fisher’s exact test. Adjusted ratios estimated Poisson regression. Results: selected nine had access five individual-level datasets. observed gingivitis according SES rurality most studies, observing highest differences low 2009 (PR experience = 2.68; PR 2.90). No nor malocclusions. Conclusion: A reduction was not over years. has remained social determinant preschoolers