Journal of the Korean Association of Oral and Maxillofacial Surgeons

  • 제46권6호
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  • Pages.385-392
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  • 2020
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  • 2234-7550(pISSN)
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  • 2234-5930(eISSN)
대한구강악안면외과학회 (The Korean Association of Oral and Maxillofacial Surgeons)
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Study of soft tissue changes in the upper lip and nose after backward movement of the maxilla in orthognathic surgery

  • Seon, Suyun (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University) ;
  • Lee, Hyun-Woo (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University) ;
  • Jeong, Bong-Jin (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University) ;
  • Lee, Baek-Soo (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University) ;
  • Kwon, Yong-Dae (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University) ;
  • Ohe, Joo-Young (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University)
  • 투고 : 2020.08.03
  • 심사 : 2020.09.24
  • 발행 : 2020.12.31
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초록

Objectives: This study evaluates soft tissue changes of the upper lip and nose after maxillary setback with orthognathic surgery such as Le Fort I or anterior segmental osteotomy. Materials and Methods: All 50 patients with bimaxillary protrusion and skeletal Class II malocclusion underwent Le Fort I or anterior segmental osteotomy with backward movement. Soft and hard tissue changes were analyzed using cephalograms collected preoperatively and 6 months postoperatively. Results: Cluster analysis on the ratios shows that 2 lines intersected at 4 mm point. Based on this point, we divided the subjects into 2 groups: Group A (less than 4 mm, 27 subjects) and Group B (more than 4 mm, 23 subjects). Also, each group was divided according to changes of upper incisor angle (≥4°=A1, B1 or <4°=A2, B2). The correlation between A and B groups for A'/ANS and Ls/Is (P<0.001) was significant; A'/A (P=0.002), PRN/A (P=0.043), PRN/ANS (P=0.032), and St/Is (P=0.010). Variation of nasolabial angle between the two groups was not significant. There was no significant correlation of vertical movement and angle variation. Conclusion: The ratio of soft tissue to hard tissue movement depends on the amount of posterior movement in the maxilla, showing approximately two times higher rates in most of the midface when posterior movement was greater than 4 mm. The soft tissue changes caused by posterior movement of the maxilla were little affected by angular changes of upper incisors. Interestingly, nasolabial angle showed a different tendency between A and B groups and was more affected by incisal angular changes when horizontal posterior movement was less than 4 mm.

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