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[Study on the growth of the nose]
1Department of Orthodontics, Asahi University, School of Dentistry.
Summary
This study analyzed Japanese nasal growth using lateral cephalograms, revealing sex-specific growth patterns and differences based on craniofacial type. Understanding these factors is crucial for effective orthodontic treatment planning.
Area of Science:
- Orthodontics
- Anthropology
- Craniofacial Biology
Background:
- Nasal growth patterns relative to craniofacial type are not well-documented.
- Lateral roentgenographic cephalometry offers a method to study nasal development.
Purpose of the Study:
- To determine the amount and direction of nasal growth in relation to craniofacial type before orthodontic treatment.
- To investigate sex-specific differences in Japanese nasal growth.
Main Methods:
- Analysis of 2782 lateral roentgenographic cephalograms from 1233 males and 1549 females (aged 5 years, 6 months+).
- Measurement of 6 linear, 2 angular nasal parameters, and 1 sectional area of the external nose.
- Cross-sectional study design excluding individuals who had undergone orthodontic treatment.
Main Results:
- Identified sex-specific adolescent growth spurts: early in females and late in males.
- Maxillary prognathic types exhibited longer nasal bones and nasal tips compared to maxillary retrognathic types.
- Significant variations in nasal growth parameters were observed across different craniofacial types.
Conclusions:
- Japanese nasal growth exhibits distinct patterns influenced by sex and craniofacial type.
- Consideration of individual craniofacial growth is essential for successful orthodontic interventions.
- Findings inform the application of orthognathic force or surgery in orthodontic treatment planning.