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Prevalence of Molar-Incisor Hypomineralization Within an Orthodontic Department in the United States

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Purpose: The purpose of this study was to determine the prevalence and severity of molar-incisor hypomineralization (MIH) by examining standard orthodontic intraoral photographs. Methods: A total of 690 patients were evaluated retrospectively for the presence or absence and extent of MIH using standardized assessment criteria. Results: Fourteen percent of all patients examined presented with MIH on at least one tooth. There was no significant difference in the presence of MIH when compared to age, race, or gender. MIH is most commonly presented on maxillary molars and maxillary central incisors as demarcated opacities with less than one-third of the tooth affected. More severe clinical status groups were associated with higher average age and were more commonly seen in molars than incisors. Conclusions: At 14 percent, the prevalence is reflective of the worldwide prevalence previously determined from other studies. MIH most commonly presents in its mildest form; however, older individuals tend to present with more severe forms, indicating that it continues to cause problems as patients age. Future studies should extend to further areas to continue to ascertain the extent and severity of this condition.


Document Type: Research Article

Affiliations: 1: Dr. Lanford is a dentist in private practice, Easley, S.C., USA 2: Dr. Yu is a professor, Department of Statistics, School of Public Health, Louisiana State University Health Sciences Center, New Orleans, La., USA 3: Dr. Ballard, Louisiana State University Health Sciences Center, New Orleans, La., USA;, Email: [email protected] 4: Dr. Johnson is an assistant professor, Department of Pediatric Dentistry, School of Dentistry, Louisiana State University Health Sciences Center, New Orleans, La., USA 5: Dr. Armbruster are professors, Department of Orthodontics, Louisiana State University Health Sciences Center, New Orleans, La., USA

Publication date: September 1, 2021

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  • Pediatric Dentistry is the official publication of the American Academy of Pediatric Dentistry, the American Board of Pediatric Dentistry and the College of Diplomates of the American Board of Pediatric Dentistry. It is published bi-monthly and is internationally recognized as the leading journal in the area of pediatric dentistry. The journal promotes the practice, education and research specifically related to the specialty of pediatric dentistry. This peer-reviewed journal features scientific articles, case reports and abstracts of current pediatric dental research.
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