S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
Molar root-incisor malformation: considerations of diverse developmental and etiologic factors
Cited 15 time in Web of Science Cited 15 time in Scopus
- Issue Date
- ELSEVIER SCIENCE INC
- ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY Vol.121 No.2, pp. 164-172
- Molar root-incisor malformation: considerations of diverse developmental and etiologic factors ; 의약학
- 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.
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