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Reliability of Anterior Nasal Spine as a Reference Point After LeFort I Surgery Using Three-Dimensional Analysis

 Seoyeon Jung  ;  Jun-Young Kim  ;  Young-Soo Jung  ;  Hwi-Dong Jung 
 JOURNAL OF CRANIOFACIAL SURGERY, Vol.33(7) : 2104-2108, 2022-10 
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Issue Date
Cephalometry / methods ; Cone-Beam Computed Tomography ; Follow-Up Studies ; Humans ; Malocclusion, Angle Class III* / diagnostic imaging ; Malocclusion, Angle Class III* / surgery ; Mandible / surgery ; Maxilla / diagnostic imaging ; Maxilla / surgery ; Orthognathic Surgical Procedures* / methods ; Osteotomy, Le Fort / methods ; Reproducibility of Results
To evaluate the stability of maxilla following orthognathic surgery, it is necessary to consider the positional change of various landmarks according to bone remodeling of the maxilla. This study aimed to evaluate the stability of the anterior nasal spine (ANS) as a reliable landmark after orthognathic surgery. Forty-seven patients with skeletal class III malocclusion who underwent bimaxillary orthognathic surgery were included. Skeletal changes were measured using cone-beam computerized tomography at 3 time points: preoperative (T0), 1-month postoperative (T1), and 12-month postoperative (T2). Linear changes of the 6 landmark points of the maxilla were measured in 3 directions: anteroposterior, vertical, and transverse. The data were analyzed with paired t tests, independent t tests, and multiple regression analysis. At 12-month postoperatively, the ANS showed mean (standard deviation) 1.23 (1.07) mm posterior movement ( P = 0.00), while other landmarks did not show positional changes, implying bony resorption of ANS. Multiple regression test showed surgical forward movements of ANS (T1-0) affect the postoperative backward changes (β = -0.05, P < 0.05). There was a negative correlation between the surgical movement and postoperative change of ANS by Pearson correlation test ( r = -0.38, P < 0.05). The ANS is not a reliable measurement point in three-dimensional superimposition after orthognathic surgery. Therefore, in studying the stability and positional change pattern after LeFort I surgery, it is not recommended to use ANS as a reference point, as changes can occur in the measurement point itself.
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2. College of Dentistry (치과대학) > Dept. of Dental Education (치의학교육학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jun-Young(김준영) ORCID logo https://orcid.org/0000-0002-6596-6135
Jung, Seoyeon(정서연)
Jung, Young Soo(정영수) ORCID logo https://orcid.org/0000-0001-5831-6508
Jung, Hwi Dong(정휘동) ORCID logo https://orcid.org/0000-0003-1025-8323
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