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Chisini LA et al. Int J Paediatr Dent 2018: 28: 123–139.

This systematic review aimed to investigate the longevity of primary teeth restorations and the reasons for failure. Longitudinal clinical studies evaluating the survival of restorations (Class I, Class II and crowns) placed with different materials in primary teeth with at least one year of follow up were reviewed. Thirty-one studies were included and a high bias risk was observed. Overall, 12,047 restorations were evaluated. A 12.5% failure rate was found. A high variation on annual failure rate was detected (0–29.9%). Composite resin showed the lowest annual failure rates (1.7–12.9%). Stainless steel crowns had the highest success rate (96.1%). Class I restorations and restorations placed using rubber dam had a reduced annual failure rate. The most common reason for failure was secondary caries (36.5%). The authors suggested the high variation on failure rate among the materials might be due to the child's behaviour during the procedure, which demands short dental appointments and a controlled environment.