The association between low birth weight and/or preterm birth and dental caries -A systematic review and meta-analysis

BackgroundStudies on the association between adverse birth outcomes and dental caries in children have shown conflicting results, so the aim of this systematic review and meta-analysis was to investigate the association between adverse birth outcomes and dental caries in children. MethodsWe systematically searched articles in four electronic databases (Web of Science, PubMed, Cochrane Library and Embase) published prior to August 2021. The odds ratio (OR) (or converted OR) and the corresponding 95% confidence intervals (95% CI) were processed. The certainty of evidence was assessed using GRADE's risk bias assessment tool. Random effects model was used for this meta-analysis. ResultsA total of thirty-one observational studies met the inclusion criteria. The pooled estimates indicated that children exposed to low birth weight (LBW)/preterm birth (PTB) did not experience higher dental caries in primary teeth. Subgroup analyses showed that children with LBW (OR: 1.30, 95% CI: 1.03-1.63) were prone to have dental caries in primary teeth for cross-sectional studies, but no significant differences for prospective studies. PTB children experienced more primary caries in high-income countries (OR: 1.31, 95% CI: 1.00-1.70) than in low- and middle-income countries. ConclusionsThe current evidence did not suggest a significant association between LBW and dental caries in children for primary teeth. Children with PTB in high-income countries had a higher prevalence of primary dental caries. Further prospective studies should adjust for confounding factors (age, oral health and family finances) to determine the definitive association between LBW/PTB and dental caries.