Molar root-incisor malformation: considerations of diverse developmental and etiologic factors

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 identifi...

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Published in:Oral surgery, oral medicine, oral pathology and oral radiology oral medicine, oral pathology and oral radiology, 2016-02, Vol.121 (2), p.164-172
Main Authors: Wright, John Timothy, DDS, MS, Curran, Alice, DMD, MS, Kim, Kyoung-Jin, DDS, MS, Yang, Yeon-Mi, DDS, PhD, Nam, Soon-Hyeun, DDS, PhD, Shin, Teo Jeon, MD, PhD, Hyun, Hong-Keun, DDS, PhD, Kim, Young-Jae, DDS, PhD, Lee, Sang-Hoon, DDS, PhD, Kim, Jung-Wook, DDS, PhD
Format: Article
Language:English
Subjects:
Dentistry
Female
Humans
Incisor - abnormalities
Incisor - diagnostic imaging
Male
Molar - abnormalities
Molar - diagnostic imaging
North Carolina
Phenotype
Radiography, Panoramic
Republic of Korea
Retrospective Studies
Risk Factors
Surgery
Tooth Abnormalities - etiology
Tooth Root - abnormalities
Tooth Root - diagnostic imaging
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Summary: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.
ISSN:2212-4403
2212-4411
DOI:10.1016/j.oooo.2015.08.024