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Preterm infants, routinely treated with antibiotics in cases of suspected sepsis, are more commonly affected by dental developmental defects. This study aimed to investigate the effects of gentamycin and ampicillin on the developing enamel in neonatal CD-1 mice in vivo.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Neonatal mice were randomized into a study (<jats:italic>n<\/jats:italic>\u2009=\u200936) and a control (<jats:italic>n<\/jats:italic>\u2009=\u200935) group. Antibiotics were injected intravenously for 4 days. All mice were sacrificed after 15\u201318\u00a0days. Micro-CT was used to analyse the mineral density (MD) of the enamel and the proportion of the enamel object volume (vol%) in first molars and incisors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We demonstrated a significantly lower vol% enamel in the maxillary (30.9% vs. 32.7%;<jats:italic>p<\/jats:italic>\u2009=\u20090.004) and mandibular (32.5% vs. 34.6%;<jats:italic>p<\/jats:italic>\u2009=\u20090.015) molars in the study group than in the controls. The incisors were divided into segments upon analysis. We demonstrated both lower vol% and lower MD of the enamel in most segments in treated individuals compared to controls (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The reduced MD and vol% in the molars and incisors are likely to have been caused by the antibiotics given during tooth development. The presented analysis of teeth in neonatal mice with micro-CT could be a valid model for further research on dental developmental defects.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s40368-021-00677-4","type":"journal-article","created":{"date-parts":[[2021,10,29]],"date-time":"2021-10-29T18:02:46Z","timestamp":1635530566000},"page":"159-168","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Effects of antibiotics on the developing enamel in neonatal mice"],"prefix":"10.1007","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2036-8702","authenticated-orcid":false,"given":"A. 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