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Infraocclusion of primary molars: a histologic study
Scandinavian Journal of Dental Research
|December 1, 1984
Summary
Ankylosis, a fusion of tooth to bone, commonly affects infraoccluded primary molars. This histological study reveals ankylosis is a dynamic process, not static, often linked to developmental issues.
Area of Science:
- Pediatric Dentistry
- Oral Histology
- Periodontology
Background:
- Infraocclusion of primary molars is a clinical observation.
- The underlying causes and histological characteristics of ankylosis in these teeth require detailed investigation.
Purpose of the Study:
- To histologically analyze the occurrence and characteristics of ankylosis in primary molars affected by infraocclusion.
- To compare these findings with primary molars in normal positions.
Main Methods:
- Histological examination of 102 primary molars (62 infraoccluded, 40 normal) from children aged 3-17 years.
- Assessment of ankylosis location, root resorption, and associated bone and pulp changes.
Main Results:
- Ankylosis was prevalent in infraoccluded molars but absent in normal teeth, primarily on the inner root surface.
- Root resorption progressed with age; ankylosis was less cervical in younger children.
- Infraoccluded teeth showed thicker buccal marginal bone crests and more frequent pulp degeneration (fibrosis, calcifications).
Conclusions:
- Ankylosis in infraoccluded primary molars is a local phenomenon, likely stemming from periodontium developmental disturbances.
- It represents an ongoing process during root resorption, not a static condition.