West China Journal of Stomatology ›› 2022, Vol. 40 ›› Issue (2): 183-188.doi: 10.7518/hxkq.2022.02.009

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Clinical retrospective study on the digital data of orthodontic cases by Andrews six elements

Liu Chaofeng1(), Xu Yanhua2, Yi Chunyan3, Liu Yan1()   

  1. 1.Dept. of Second Outpatient, Kunming Medical University Affiliated Stomatological Hospital, Kunming 650000, China
    2.Dept. of Orthodontics, Kunming Medical University Affiliated Stomatological Hospital, Kunming 650000, China
    3.Dept. of Stomatology, Kunming Medical University Affiliated Yan’an Hospital, Kunming 650000, China
  • Received:2021-06-15 Revised:2022-01-10 Online:2022-04-01 Published:2022-04-01
  • Contact: Liu Yan E-mail:603218831@qq.com;18687162452@163.com
  • Supported by:
    The National Natural Science Foundation of China(81960195);Innovation Team of Yunnan Province(202005AE160033);Science and Technology Innovation Team of Kunming Medical University(CXTD2020xx);University Students Innovation Training Project of Yunnan Province(202110678019);Correspondence: Liu Yan, E-mail: 18687162452@163.com

Abstract: Objective

Andrews six elements was used to explore the possible influences of gender, extraction/non-extraction, and different bracket types on the evaluation of orthodontic treatment outcome.

Methods

Digital data from 320 selected orthodontic cases in Kunming Medical University Affiliated Stomatological Hospital during the period of 2016—2020 were divided into groups in accordance with gender, tooth extraction, and type of orthodontic brackets (DamonQ self-ligating brackets and MBT brackets). Measurement was performed using Andrews six elements as standard. The mean and standard deviation of each individual score and total score for different groups were calculated and statistically tested.

Results

The differences in total scores between female and male cases exhibited no statistical significance (P>0.05). By contrast, the scores in skeletal width change of the maxilla between extraction cases and non-extraction cases presented statistical significance (P<0.05). Moreover, the scores in the anteroposterior change in the position of the maxillary incisors, the bucco-lingual border change of the mandibular arch, and the skeletal width change of the maxilla between the DamonQ self-ligating bracket and MBT bracket cases presented statistical significance (P<0.05). The cases with DamonQ self-ligating brackets had significantly lower scores than the cases with MBT brackets in the bucco-lingual border change of the mandibular arch, the skeletal width change of the maxilla, and the anteroposterior change in position of the maxillary incisors.

Conclusion

Digital 3D models can be used in the clinical retrospective studies of patients after orthodontic treatment. These models can be measured repeatedly and have clinical application value. For cases with incomplete orthodontic treatment, the control of the anteroposterior position of the incisor and the width of the arch of the upper tooth is crucial. Total treatment efficiency between female and male cases exhibited no difference, but the skeletal width change of the maxilla between extraction and non-extraction cases may exert an effect on cases with complete orthodontic treatment. The group that used DamonQ self-ligating brackets may achieve good adjustment of the bucco-lingual border change of the arch.

Key words: Andrews six elements, malocclusion cases, digital oral model, retrospective study

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