Management of Severely Aberrant Permanent First Molars in Molar Root-Incisor Malformation Patients: Case Series and a Guideline.

Ji-Soo Song,Jung-Wook Kim,Young-Jae Kim,Yeon-Mi Yang

doi:10.3390/children8100904

Ji-Soo Song, Jung-Wook Kim + Show 2 more

Open Access

https://doi.org/10.3390/children8100904

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Journal: Children	Publication Date: Oct 11, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Seoul National University, Jeonbuk National University

Abstract

Recently, a new type of dental anomaly, a molar–incisor malformation or molar root–incisor malformation (MRIM), was recognized. The disease phenotype is now relatively well characterized; however, its etiology and disease-mechanism need to be elucidated. The affected teeth do not respond well to conventional treatment because of severe malformation and an unusual root structure. In this study, we present the treatment of MRIM cases with the extraction of severely aberrant permanent first molars (PFMs) and suggest that the PFM extractions are performed when it is clear that third molars will develop. The purpose of this report was primarily to present amendments to the guidelines for the treatment of patients with MRIM.

Highlights

A unique form of deformity in tooth development was recognized
A subsequent report with 12 affected children extended the phenotype to the deciduous second molars and maxillary central incisors in addition to the permanent first molars (PFMs) [2]
Recommendations were suggested for the diagnosis and treatment planning of molar root–incisor malformation (MRIM) patients, and the planned and timely extraction of PFM(s) was suggested in cases of severe malformation with a poor long-term prognosis [3,16]

Summary

Introduction

Its phenotypic feature was first characterized by severe dysplastic root malformations with intact crowns in all four permanent first molars (PFMs) in two affected children who had significant events (osteomyelitis or preterm birth) before the end of the first year after birth [1]. A subsequent report with 12 affected children extended the phenotype to the deciduous second molars and maxillary central incisors in addition to the PFMs [2]. The deciduous second molars had similar characteristics to the PFMs, but the maxillary central incisors had wedge-shaped constriction defects at the cervical region. They called it a molar–incisor malformation to indicate defects in the PFMs and maxillary central incisors

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Discussion

Conclusion