Prevalence of hypomineralised second primary molars (HSPM): A systematic review and meta‐analysis.

Aim: To evaluate the prevalence of HSPM worldwide on a child and a tooth level and investigate the influence of diagnostic criteria on the prevalence of HSPM. Design: A comprehensive literature search was performed through MEDLINE/PubMed, Scopus, and Web of Science databases. The grey literature was also screened as were the reference lists of included studies. An adaptation of the Newcastle‐Ottawa Scale was used to evaluate the quality of the studies. A meta‐analysis was performed to determine the pooled prevalence of HSPM. Results: The search strategy identified 1,988 articles, 487 were retrieved for full‐text evaluation, and 37 studies were included in the meta‐analysis (32 for child and 23 for tooth level prevalence), providing data from 26,805 individuals and 81,107 molars. The prevalence of HSPM was 6.8% (95% CI 4.98%‐8.86%) on a child level and 4.08% on a tooth level (95% CI = 2.80%‐5.59%). The diagnostic criteria used did not seem to influence the prevalence results (P >.05). The majority of the papers (75%) showed a low‐to‐moderate risk of bias. Conclusion: There was a broad variation in the prevalence reported that may be attributed to differences in the study population. The present meta‐analysis showed a HSPM prevalence worldwide of 6.8% on a child level and 4.1% on a tooth level. [ABSTRACT FROM AUTHOR]