This high-yield revision note on Enamel Hypoplasia vs Amelogenesis Imperfecta vs Fluorosis covers everything examiners typically test under Oral Pathology — structured as quick-reference tables, clinical correlations, mnemonics and previous-year-style high-yield points. It's built for last-mile revision before NEET MDS, INI-CET MDS and INBDE, so you can scan it in minutes instead of re-reading a whole textbook chapter.
| Condition | Cause | Appearance | Distribution |
|---|---|---|---|
| Enamel hypoplasia | A localized insult during amelogenesis (fever, trauma, nutritional deficiency, local infection - "Turner tooth" when caused by periapical infection of the primary predecessor) | Pits, grooves, or areas of missing enamel; the enamel present is usually of normal color | Can follow a chronologic pattern (systemic cause) OR be strictly localized to a single tooth (as in a Turner tooth) |
| Amelogenesis imperfecta (AI) | Genetic (mutations in AMELX, ENAM, MMP20, KLK4, etc.) | Hypoplastic type (thin, pitted enamel), Hypocalcified type (soft enamel, easily lost, initially normal thickness), Hypomaturation type (mottled, opaque, "snow-capped" appearance) | GENERALIZED - affects essentially ALL teeth in BOTH the primary and permanent dentitions, often with a familial inheritance pattern |
| Fluorosis | Excess fluoride ingestion DURING the period of enamel formation (typically before 8 years of age) | Mild: white flecks/striations; Severe: brown staining with pitting (graded using Dean's Fluorosis Index) | Bilateral and symmetric; dose- and exposure-timing-dependent, affecting only teeth that were forming during the period of excess exposure |
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