John Timothy Wright1, Alice Curran2, Kyoung-Jin Kim3, Yeon-Mi Yang4, Soon-Hyeun Nam5, Teo Jeon Shin3, Hong-Keun Hyun3, Young-Jae Kim3, Sang-Hoon Lee3, Jung-Wook Kim6. 1. Department of Pediatric Dentistry School of Dentistry, University of North Carolina, NC, USA. 2. Department of Diagnostic Sciences, School of Dentistry, University of North Carolina, NC, USA. 3. Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea. 4. Department of Pediatric Dentistry, School of Dentistry, Chonbuk National University, Jeonju-si, Jeollabuk-do, Korea. 5. Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea. 6. Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea; Department of Molecular Genetics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea. Electronic address: pedoman@snu.ac.kr.
Abstract
OBJECTIVE: The objective of this study was to evaluate the variation in the condition referred to as molar root-incisor malformation (MRIM) and elucidate the distribution of affected teeth. This study further aimed to identify associated environmental stressors. STUDY DESIGN: Individuals were identified through retrospective review of dental radiographs and through referral to the investigators. Histologic evaluation included examination of mineralized and decalcified sections of affected first permanent molar teeth. RESULTS: Thirty cases of MRIM were identified, with all having affected first permanent molars with dysplastic root formation. The primary second molars were affected in 57% of the cases, with permanent anterior teeth being involved in 40% of the cases. A variety of medical conditions were associated with MRIM, the most common being neurologic. Several affected individuals reported no significant past medical history or environmental stressors. CONCLUSIONS: The etiology of MRIM remains unclear, and this unique developmental defect of the first permanent molar roots appears to occur in populations throughout the world. Clinicians identifying the MRIM phenotype should carefully evaluate the permanent incisors for associated developmental defects that could result in pulpal necrosis.
OBJECTIVE: The objective of this study was to evaluate the variation in the condition referred to as molar root-incisor malformation (MRIM) and elucidate the distribution of affected teeth. This study further aimed to identify associated environmental stressors. STUDY DESIGN: Individuals were identified through retrospective review of dental radiographs and through referral to the investigators. Histologic evaluation included examination of mineralized and decalcified sections of affected first permanent molar teeth. RESULTS: Thirty cases of MRIM were identified, with all having affected first permanent molars with dysplastic root formation. The primary second molars were affected in 57% of the cases, with permanent anterior teeth being involved in 40% of the cases. A variety of medical conditions were associated with MRIM, the most common being neurologic. Several affected individuals reported no significant past medical history or environmental stressors. CONCLUSIONS: The etiology of MRIM remains unclear, and this unique developmental defect of the first permanent molar roots appears to occur in populations throughout the world. Clinicians identifying the MRIM phenotype should carefully evaluate the permanent incisors for associated developmental defects that could result in pulpal necrosis.