fa Oral medicine Oral medicine Original article Original article <p style="text-align: justify;"><strong><span dir="LTR">Background and Aim: </span></strong><span dir="LTR">Tooth eruption is a multifaceted physiological process, which can be delayed by factors such as malnutrition. This study aimed to compare the serum levels of vitamin D and calcium in infants with a longer than normal eruption time of the first deciduous tooth with the control group (normal eruption).</span></p> <p style="text-align: justify;"><strong><span dir="LTR">Materials and Methods:</span></strong><span dir="LTR"> In this case-control study, serum levels of vitamin D in 61 children with a mean age of normal dental eruption in Iranian children (8 months and less) were compared with 61 children with eruption age of more than 8 months. The children were matched in terms of age, sex, place of birth and residence, age of birth, birth weight, and other eruption-related items. Student&#39;s t-test, analysis of variance (ANOVA), and chi-square test were used for statistical analysis.</span></p> <p style="text-align: justify;"><strong><span dir="LTR">Results:</span></strong><span dir="LTR"> The first erupted tooth in all infants was the mandibular incisor. The mean serum level of vitamin D was 38.1&plusmn;24.1 ng/ml in infants with eruption age of 8 months or less and 40.0&plusmn;21.5 ng/ml in the group of eruption age over 8 months (P=0.63). Serum calcium level was 10.03&plusmn;0.55 mg/dl in the first group and 9.92&plusmn;0.57 mg/dl in the second group (P=0.28). There was no significant relationship between gender, maternal education, A+D supplementation, infant nutrition (breast milk, formula, and combination), and different levels of vitamin D (deficient, inadequate, adequate, and toxic) with the average age of eruption of the first deciduous tooth (P>0.05).</span></p> <p style="text-align: justify;"><strong><span dir="LTR">Conclusion: </span></strong><span dir="LTR">It seems that serum vitamin D and calcium levels in this age group do not affect the eruption time of deciduous teeth.</span></p> Eruption, Deciduous Tooth, Serum, Vitamin D, Calcium 25 30 http://jrdms.dentaliau.ac.ir/browse.php?a_code=A-10-320-2&slc_lang=fa&sid=1 A Noori Nezhad akramnoori19@gmail.com 10031947532846008771 10031947532846008771 No Private Practice, Tehran, Iran k Salem katayoun.salem@gmail.com 10031947532846008772 10031947532846008772 No Pediatric Dentistry Dept, Faculty of Dentistry,Tehran Medical Sciences,Islamic Azad University, Tehran, Iran. M Zamanian drmehrdadzamanian@gmail.com 10031947532846008773 10031947532846008773 No Pediatric Dentistry Dept, Faculty of Dentistry,Tehran Medical Sciences,Islamic Azad University, Tehran, Iran. S Aghaei saba_aghaee@yahoo.com 10031947532846008774 10031947532846008774 Yes Pediatric Dentistry Dept, Faculty of Dentistry,Tehran Medical Sciences, Islamic Azad University, Tehran, Iran