en Oral medicin Oral medicin Case report <p><strong>Background: </strong>Dentin dysplasia (DD) is a rare disturbance of dentin formation, characterized by normal enamel but atypical dentin formation with abnormal pulpal morphology. In DD type I, the teeth appear clinically normal in morphologic appearance and color. Radiographic analysis shows obliteration of all pulp chambers as well as short, blunted, and malformed or absent roots with multiple periapical radiolucencies involving apparently intact teeth. <span dir="RTL"></span><br> <strong>Case Presentation:</strong> We present a case of a 15-year-old girl with a developmental disturbance of dentin similar to DD type 1. Radiographic examination revealed multiple affected teeth with unique findings in accordance with DD 1d subtype. This article highlights the clinical and radiographic findings of this condition along with the differential diagnosis and management. <span dir="RTL"></span><br> <strong>Conclusion: </strong>Management of patients with DD is difficult and requires a multidisciplinary approach. Early diagnosis of the condition is important for the initiation of effective preventive treatment.<br> <br> <span new="" style="font-size: 12pt; line-height: 107%; font-family: " times=""><span style="background:white"></span></span></p> Tooth Abnormalities, Dentin Dysplasia, Rootless Teeth 37 42 http://jrdms.dentaliau.ac.ir/browse.php?a_code=A-10-688-1&slc_lang=en&sid=1 A Rashidian a_rashidian@dentaliau.ac.ir 10031947532846009740 10031947532846009740 No Assistant Professor, Pediatric dentistry Dept, Faculty of Dentistry, Tehran Medical Sciences SH Zahraei shohrehz@gmail.com 10031947532846009741 10031947532846009741 Yes postgraduate student, Pediatric dentistry Dept, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran SS Hashemi 10031947532846009742 10031947532846009742 No Post-graduate student, periodontal Dept, faculty of Dentistry,Tehran medical sciences