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Consecutive tooth agenesis patterns in non-syndromic oligodontia
Ryuichi Baba1, Ayaka Sato1, Kazuhito Arai2
1Department of Orthodontics, School of Life Dentistry At Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.
Odontology
|July 8, 2021
Summary
Consecutive tooth agenesis (CTA) is common in oligodontia patients, often affecting multiple teeth. This pattern is more prevalent in the upper jaw, particularly when it spans from front to back teeth.
Area of Science:
- Dentistry
- Orthodontics
- Genetics
Background:
- Consecutive tooth agenesis (CTA) is a significant feature of oligodontia, necessitating extensive orthodontic treatment.
- Understanding CTA patterns in non-syndromic oligodontia is crucial for effective long-term management.
Purpose of the Study:
- To investigate the characteristics of consecutive tooth agenesis (CTA) patterns in orthodontic patients with non-syndromic oligodontia.
- To compare CTA prevalence and patterns between patients with oligodontia (≥6 missing teeth) and hypodontia (1-5 missing teeth).
Main Methods:
- Panoramic radiographs were used to evaluate agenetic permanent teeth (excluding third molars) in 97 oligodontia and 107 hypodontia patients.
- Consecutive tooth agenesis (CTA) patterns were categorized by location (anterior/posterior) and severity within each quadrant.
- CTA prevalence and specific patterns were compared between the oligodontia and hypodontia groups, including third molars.
Main Results:
- Consecutive tooth agenesis (CTA) was present in 91.8% of oligodontia patients versus 4.7% of hypodontia patients.
- The most frequent CTA patterns involved first/second premolar agenesis in oligodontia and second/third molar agenesis in hypodontia.
- Type IIIA CTA (anterior and posterior segments) was significantly more common in the maxillary than mandibular quadrants among oligodontia patients.
Conclusions:
- Most orthodontic patients with oligodontia exhibit consecutive tooth agenesis (CTA).
- A severe CTA pattern extending from anterior to posterior teeth is more frequent in the maxilla than the mandible.
- These findings highlight the importance of recognizing specific CTA patterns for tailored orthodontic interventions in oligodontia.
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