The present study aims to Critically review and summarise about the literature on the effectiveness of Diazepam compared to Midazolam in controlling children's negative behaviour during dental care. This is a critical review of the literature. The PICO strategy was adopted for this review: Population (children with negative behaviour during dental care), Intervention (Diazepam), Comparator (Midazolam), Outcome (Effectiveness in controlling anxiety associated with negative behaviour). Randomised Clinical Trials (RCTs) were included using the descriptors "Diazepam", "Midazolam" and "Dental Care" combined or not, in the Medline (via PubMed), Scopus, Web of Science, Cochrane and Embase databases. 270 articles were found, of which 6 were selected for full reading. Of these, 5 were excluded because they assessed populations that fell outside the eligibility criteria of this review. Therefore, only 1 RCT was assessed in terms of level of evidence and risk of bias. According to its study design, it was a triple-blind RCT, with a sample size of 40 children aged between 2 and 10 years, which assessed the effectiveness of oral Midazolam, oral Diazepam, intravenous Midazolam and an oral placebo. Of the four groups, intravenous Midazolam produced greater sedation and was more acceptable to patients. However, the study was classified as level III evidence, with a high risk of bias. Midazolam seems to produce greater control of children's negative behaviour during dental procedures when compared to diazepam.
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