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Crown shape of maxillary molars with delayed eruption
Nomintsetseg Batbayar1, Takashi Kameda, Natsuki Sano-Sekikawa
1Department of Orthodontics, The Nippon Dental University School of Dentistry at Niigata.
Okajimas Folia Anatomica Japonica
|February 21, 2017
Summary
Delayed eruption in maxillary molars (DEMo1) shows crown shapes similar to both first (U6n) and second (U7n) molars. These findings suggest DEMo1 teeth may represent delayed U6 or U7, or an intermediate form.
Area of Science:
- Dental Morphology
- Human Anatomy
- Developmental Biology
Background:
- Delayed tooth eruption can impact dental arch development and occlusion.
- Understanding the morphology of unerupted teeth is crucial for diagnosis and treatment planning.
Purpose of the Study:
- To investigate the crown morphology of maxillary molars with delayed eruption (DEMo1).
- To compare DEMo1 crown shapes with normally erupted maxillary first (U6n) and second (U7n) molars.
Main Methods:
- Analysis of crown shapes of 12 DEMo1 teeth using seven landmarks.
- Comparison with 25 U6n and 25 U7n teeth from Japanese females.
- Application of discriminant function analysis for classification.
Main Results:
- Discriminant function analysis correctly classified 84% of DEMo1 teeth.
- Five DEMo1 teeth were classified as similar to U6n, and seven as similar to U7n.
- Subgrouping based on distolingual cusp position further differentiated DEMo1 teeth.
Conclusions:
- Maxillary molars with delayed eruption exhibit crown morphology that can resemble either first or second molars.
- DEMo1 teeth may represent delayed eruption of U6 or U7, or an intermediate morphological type.
- Further research into the developmental origins of DEMo1 morphology is warranted.
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