Nothing new under the heavens: MIH in the past?
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Aim: This was to study an archaeological population of sub-adult teeth in 17th and 18th century skeletal material from a London (England) cemetery for enamel defects including molar-incisor-hypomineralisation (MIH). Methods: Dentitions of 45 sub-adults were examined using standard macroscopic methods and systematically recorded. A total of 557 teeth were examined with a *5 lens and photographed. Ages of the individuals were estimated from their dental crown and root development stages and not from charts that combine tooth eruption with development stages. The dental age of the individual and the approximate age of onset of enamel defects was then calculated on the basis of the chronological sequence of incremental deposition and calcification of the enamel matrix. Affected enamel was graded macroscopically as: — Mild: <30% of the tooth’s enamel surface area visibly disrupted (this encompasses the entire range reported in most other studies), Moderate: 31–49% of the tooth’s enamel surface area visibly disrupted and Severe: >50% of the tooth’s enamel surface area visibly disrupted. Results: Of the total number of individuals 41 (93.2%) showed signs of enamel developmental dysplasia or MIH, 28 of them showing moderate or severe lesions of molars, primary or permanent (63.6% of the sample). Incisors and canines, though surviving much less often, showed episodes of linear hypoplasia. Conclusion: The extensive lesions seen on many of the molars displayed cuspal enamel hypoplasia (CEH). Many of these teeth also exhibited Molar Incisal Hypomineralisation (MIH).
Key wordsmolar-incisor-hypomineralisation archaeology
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