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Numeric anomalies of teeth in concomitant hypodontia and hyperdontia
1Department of Pedodontics and Orthodontics, University of Helsinki, Finland.
Journal of Craniofacial Genetics and Developmental Biology
|January 1, 1988
Summary
Children can have both extra teeth (supernumerary) and missing teeth (agenesis). These dental anomalies occur together more often in permanent teeth and may stem from early developmental disturbances.
Area of Science:
- Dentistry
- Developmental Biology
- Genetics
Background:
- Dental anomalies like supernumerary teeth (hyperdontia) and congenitally missing teeth (hypodontia) can occur independently.
- Simultaneous occurrence of both conditions is less common and its etiology is not fully understood.
Purpose of the Study:
- To describe variations in tooth number in children with both supernumerary teeth and tooth agenesis.
- To analyze the occurrence of concomitant hypodontia and hyperdontia within the same dentition, jaw, or jaw quadrant.
Main Methods:
- Case series describing 11 children with both supernumerary teeth and tooth agenesis.
- Inclusion criteria focused on anomalies outside the cleft alveolus area.
- Analysis of occurrence in deciduous and permanent dentitions, same jaw, and same jaw quadrant.
Main Results:
- Concomitant hypodontia and hyperdontia were observed in the same dentition (9/11), same jaw (8/11), and same jaw quadrant (3/11).
- These anomalies occurred more frequently simultaneously in permanent dentitions compared to deciduous or both.
- Total supernumerary teeth: 10 (deciduous) and 14 (permanent). Total congenitally missing teeth: 14 (deciduous) and 40 (permanent).
Conclusions:
- The simultaneous presence of supernumerary teeth and agenesis suggests complex developmental disturbances.
- Potential etiologies include disruptions in neural crest cell migration, proliferation, differentiation, or epithelial-mesenchymal interactions during odontogenesis.