Barzilai University Medical Center

21 Research Day 2020 Barzilai University Medical Center 11 THE PREVALENCE OF PRE-ERUPTIVE INTRA-CORONAL RESORPTION (PEIR) AMONG 5-18 YEARS OLD CHILDREN IN ISRAEL Hakim Juna, Eliahu Mass, Uri Zilberman Pediatric Dental Clinic, Barzilai Medical University Center, Ashkelon Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel. Background Pre-eruptive intra-coronal radiolucency (PEIR), is described as a radiolucent lesion located in the coronal dentine, just beneath the enamel-dentine junction (DEJ) of an un-erupted tooth. Objectives To screen for the presence of PEIR by examining panoramic radiographs of 5-18 years old Israeli patients. The prevalence of PEIR, its location, and most affected tooth type were evaluated. Methods and materials A retrospective study of PEIR was conducted on 1000 panoramic radiographs of Israeli children with an age range of 5-18 years. The panoramic radiographs were obtained from two Pano centers in Ashkelon & Bat-Yam city. Each radiograph was reviewed by three examiners. Results PEIR was found in 1.3% of the studied patients (13/1000). All subjects in this study had only one affected tooth. Most PEIR were located in the mandibular teeth (76.9%). The most affected teeth were the mandibular second molars (46%), followed by the maxillary third molars (23%), and by the mandibular first molar and second pre-molar (15%). All PEIR lesions in the present study were located within the dentine beneath the dentino-enamel junction, and had no enamel and pulpal involvement. 53.8% of the PEIR lesions were in the mesial part of the crown. When the size of defects was classified relative to the depth of coronal dentin, it was noted that most lesions had extended more than two-third of the thickness of coronal dentin (69.2%). Conclusions Although the results of the present study suggest that PEIR has a relatively low prevalence, clinicians should be aware of the lesion. Early detection of PEIR while the tooth is still un-erupted is crucial in the proper diagnosis and timely management of the lesions.