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Published on: November 13, 2013
Study of delayed development of the upper first molars
Natsuki Sano1, Yuh Hasegawa, Shigeki Iijima
1Department of Orthoclontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata 951-8580, Japan.
Okajimas Folia Anatomica Japonica
|August 19, 2010
Summary
Delayed upper first molar (UFM) eruption in children was studied. Delayed UFM development was observed at the initial cleft formation stage, indicating a significant delay in tooth formation for affected individuals.
Area of Science:
- Dentistry
- Orthodontics
- Pediatric Dentistry
Background:
- Delayed eruption of upper first molars (UFMs) can impact occlusion and overall dental development.
- Early identification and understanding of delayed tooth formation are crucial for timely orthodontic intervention.
Purpose of the Study:
- To analyze the developmental status of upper first molars in patients with suspected delayed eruption.
- To quantify the delay in tooth formation using established radiographic methods.
Main Methods:
- Panoramic radiographs of 51 patients (95 teeth) with delayed UFM eruption were analyzed.
- Tooth development stages were assessed using the Moorrees et al. method.
- Logistic curves were fitted to correlate developmental stage with chronological age.
Main Results:
- Delayed UFMs were identified at the initial cleft formation stage.
- This developmental stage indicated a delay of 2.09 years in boys and 2.84 years in girls.
- The delay was generally bilateral, with no significant difference between right and left sides.
Conclusions:
- The initial cleft formation stage signifies a substantial delay in UFM development, exceeding 2.5 years based on logistic curve analysis.
- Findings highlight the importance of radiographic assessment for diagnosing delayed tooth eruption in orthodontic practice.
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