Purpose: According to clinical experience, the ANB angle (A point, nasion, B point) norm value of Taiwan Association of Orthodontists (TAO) board examination seems to be larger than the Taiwanese population. Therefore, this study aimed to integrate studies of Taiwanese cephalometric norms by a meta-analysis.
Patients and Methods: Studies were searched from electronic database of PubMed, National Digital Library of Theses and Dissertations in Taiwan, and physical libraries. Ten measurement values were collected. According to age and gender, all samples were divided into three groups. A meta-analysis of the mean and standard deviation values in all groups was performed.
Results: The search across the databases identified 253 studies, and 10 studies met the inclusion criteria. Most of the results were similar to TAO norms. However, the ANB of the TAO norm was larger than the results of the three groups. Specifically, in group A (aged 10–30 years), males had ANB of 1.56°–5.04°, while females had 1.15°–4.55°. In group B (aged 10–14 years), males had 1.53°–5.11°, while females had 1.3°–4.76°. In group C (aged 15–30 years), males had 1.4–5.02°, while females had 0.7°–3.8°. Conclusion: This study integrated the norms of previous studies in Taiwanese population. The results revealed that the ANB norm of TAO was larger. This study provides a new reference for the establishment of normal values in the future.
Chan, Ya-Lan; Cheng, Johnson Hsin-Chung; Chen, Pei-Hsuan; and Chen, Daniel De-Shing
"Is the ANB Norm in TAO Board Examination Appropriate? Meta-analysis of Taiwanese Cephalometric Norms,"
Taiwanese Journal of Orthodontics: Vol. 33:
4, Article 1.
Available at: https://www.tjo.org.tw/tjo/vol33/iss4/1
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