Embryology and tooth development
The branchial arches, palate and tooth germs explain common developmental anomalies. Disturbance at initiation, morphodifferentiation or mineralisation has different outcomes.
Understand
Tooth development proceeds through initiation, bud, cap and bell stages, followed by hard tissue formation and eruption. Disturbance at different stages can alter number, shape, mineralisation or position.
Assess
Take a family, medical and developmental history when several teeth are affected. Examine the pattern across primary and permanent dentitions; a local defect differs from a generalised developmental disturbance.
Apply
Explain an anomaly in terms of its likely developmental window, then plan prevention and treatment around sensitivity, caries risk, appearance and eruption. Palatal fusion errors and craniofacial syndromes require multidisciplinary context.
Key distinctions
Ameloblasts are lost after enamel formation, which helps explain why enamel defects do not biologically repair like bone. Timing of a systemic insult can leave a chronological pattern across developing teeth. Distinguish a qualitative defect in mineralisation from reduced enamel quantity; the two have different appearance, sensitivity and restorative implications.
Think through a case
A child has several first permanent molars with demarcated opacities but normal primary teeth. Consider the timing of mineralisation rather than assuming every opacity is fluorosis.
The distinction to remember
A developmental defect is not automatically a genetic syndrome. Pattern, timing and associated findings guide the differential and the need for further investigation.
Test your recall
What process is disrupted in cleft palate?
Show answer
Fusion of the palatal shelves.