The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Midfacial soft tissue changes after maxillary expansion using micro-implant-supported maxillary skeletal expanders in young adults: A retrospective study

  • Nguyen, Hieu (Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine) ;
  • Shin, Jeong Won (Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine) ;
  • Giap, Hai-Van (Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine) ;
  • Kim, Ki Beom (Department of Orthodontics, Center for Advanced Dental Education, Saint Louis University) ;
  • Chae, Hwa Sung (Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine) ;
  • Kim, Young Ho (Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine) ;
  • Choi, Hae Won (Department of Orthodontics, The Institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine)
  • Received : 2020.07.02
  • Accepted : 2020.11.16
  • Published : 2021.05.25
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Abstract

Objective: The aim of this retrospective study was to assess the midfacial soft tissue changes following maxillary expansion using micro-implant-supported maxillary skeletal expanders (MSEs) in young adults by cone-beam computerized tomography (CBCT) and to evaluate the correlations between hard and soft tissue changes after MSE usage. Methods: Twenty patients (mean age, 22.4 years; range, 17.6-27.1) with maxillary transverse deficiency treated with MSEs were selected. Mean expansion amount was 6.5 mm. CBCT images taken before and after expansion were superimposed to measure the changes in soft and hard tissue landmarks. Statistical analyses were performed using paired t-test and Pearson's correlation analysis on the basis of the normality of data. Results: Average lateral movement of the cheek points was 1.35 mm (right) and 1.08 mm (left), and that of the alar curvature points was 1.03 mm (right) and 1.02 mm (left). Average forward displacement of the cheek points was 0.59 mm (right) and 0.44 mm (left), and that of the alar curvature points was 0.61 mm (right) and 0.77 mm (left) (p < 0.05). Anterior nasal spine (ANS), posterior nasal spine (PNS), and alveolar bone width showed significant increments (p < 0.05). Changes in the cheek and alar curvature points on both sides significantly correlated with hard tissue changes (p < 0.05). Conclusions: Maxillary expansion using MSEs resulted in significant lateral and forward movements of the soft tissues of cheek and alar curvature points on both sides in young adults and correlated with the maxillary suture opening at the ANS and PNS.

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References

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