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Evaluation of optimal anterior-posterior position of upper incisors through ANS point: a retrospective study on a Chinese sample

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Abstract

Objectives

This study was designed to determine the optimal anterior-posterior (AP) position of upper incisors through Anterior Nasal Spine (ANS) point.

Materials and methods

Lateral cephalometric radiographic images of 690 patients were collected and divided into a derivation group and a validation group, and the former were subdivided into a proper AP position (PAP) group and an improper AP position (iPAP) group. The distance from facia-axis (FA) point of upper incisors to the line perpendicular to Frankfort horizontal (FH) plane through ANS (FA-ANS) was measured, and the relationship between FA-ANS and several cephalometric indices were studied through Pearson correlation analysis. Receiver operating characteristic (ROC) curves for different clinical indices were analyzed to evaluate the diagnostic efficiency of optimal AP position of upper incisors.

Results

The average value of FA-ANS in PAP group was 0.57±1.99, which was significantly different from FA-ANS in iPAP group. Cephalometric indices such as U1-NA, U1-SN, AB-NPo, UL-TVL, Wits, and ANB were found to be correlated with FA-ANS. The receiver operating characteristic (ROC) curves represented a greater diagnostic efficiency of FA-ANS compared with other clinical indices.

Conclusions

ANS point, as a stable skeletal landmark, could be used to access an optimal AP position of upper incisors, providing aids to clinical diagnosis and treatment goal determination for clinical practice.

Clinical relevance

A new index FA-ANS, together with other traditional indices, could help determine the optimal position of upper incisors and provide a personalized therapeutic plan.

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Funding

This study was funded by the National Natural Science Foundation [32271364] and [31971240], Clinical Research Project of West China Hospital of Stomatology, Sichuan University [LCYJ2019-22], and Chengdu Artificial Intelligence Application Development Industrial Technology Basic Public Service Platform [2021-0166-1-2].

Author information

Authors and Affiliations

  1. State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, Sichuan, China

    Qingchen Feng, Jiawei Zhou, Guanning Zhang, Hongxiang Mei, Chongying Su, Chen Jiang, Mei Zhang & Juan Li

  2. Chongqing University Three Gorges Hospital, Chongqing, China

    Fulin Jiang

  3. Department of Stomatology, Suining Municipal Hospital of TCM, Suining, Sichuan, China

    Gongjie Liao

Authors
  1. Qingchen Feng
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  2. Jiawei Zhou
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  4. Hongxiang Mei
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  6. Chen Jiang
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  7. Mei Zhang
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  8. Fulin Jiang
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  9. Gongjie Liao
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  10. Juan Li
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Corresponding author

Correspondence to Juan Li.

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Ethics approval and consent to participate

The study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). The study was approved by the Research Ethics Committee of West China Hospital of Stomatology (Number: WCHSIRB-D-2021-136) and informed consent was taken from all individual participants.

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The authors declare no competing interests.

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Feng, Q., Zhou, J., Zhang, G. et al. Evaluation of optimal anterior-posterior position of upper incisors through ANS point: a retrospective study on a Chinese sample. Clin Oral Invest 27, 5947–5955 (2023). https://doi.org/10.1007/s00784-023-05208-7

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