Correlation between skeletal and dental changes after mandibular setback surgery-first orthodontic treatment = Cone-beam computed tomographygenerated half-cephalograms

다국어 초록 (Multilingual Abstract)

Objective: To investigate skeletal and dental changes after application of a mandibular setback surgery-first orthodontic treatment approach in cases of skeletal Class III malocclusion. Methods: A retrospective study of 34 patients (23 men, 11 women; mean age, 26.2 ± 6.6 years) with skeletal Class III deformities, who underwent surgery-first orthodontic treatment, was conducted. Skeletal landmarks in the maxilla and mandible at three time points, pre-treatment (T0), immediate-postoperative (T1), and post-treatment (T2), were analyzed using cone-beam computed tomography (CBCT)-generated half-cephalograms. Results: The significant T0 to T1 mandibular changes occurred ?9.24 ± 3.97 mm horizontally. From T1 to T2, the mandible tended to move forward 1.22 ± 2.02 mm, while the condylar position (Cd to Po-perpendicular plane) shifted backward, and the coronoid process (Cp to FH plane) moved vertically. Between T1 and T2, the vertical dimension changed significantly (p < 0.05). Changes in the vertical dimension were significantly correlated to T1 to T2 changes in the Cd to Po-perpendicular plane (r = ?0.671, p = 0.034), and in the Cp to FH plane (r = 0.733, p = 0.016), as well as to T0 to T1 changes in the Cp to Poperpendicular plane (r = 0.758, p = 0.011). Conclusions: Greater alterations in the vertical dimension caused larger post-treatment (T2) stage skeletal changes. Studying the mandibular position in relation to the post-surgical vertical dimension emphasized the integral importance of vertical dimension control and proximal segment management to the success of surgery-first orthodontic treatment.

목차 (Table of Contents)

• INTRODUCTION
• MATERIALS AND METHODS
• RESULTS
• DISCUSSION
• CONCLUSION
• REFERENCES

참고문헌 (Reference)

1 Nagasaka H, "“Surgery first" skeletal Class III correction using the Skeletal Anchorage System" 43 : 97-105, 2009

2 Hernández-Alfaro F, "“Surgery first" in bimaxillary orthognathic surgery" 69 : e201-207, 2011

3 Hyeon-Shik Hwang, "Use of Reference Ear Plug to improve accuracy of lateral cephalograms generated from cone-beam computed tomography scans" 대한치과교정학회 43 (43): 54-61, 2013

4 Kim SJ, "The reliability of cone-beam computed tomography (CBCT) - generated frontal cephalograms" 40 : e331-336, 2012

5 Lee JH, "The 3D CT superimposition method using image fusion based on the maximum mutual information algorithm for the assessment of oral and maxillofacial surgery treatment results" 114 : 167-174, 2012

6 Park KR, "Surgery-first approach on patients with temporomandibular joint disease by intraoral vertical ramus osteotomy" 116 : e429-436, 2013

7 Baek SH, "Surgery-first approach in skeletal class III malocclusion treated with 2-jaw surgery: evaluation of surgical movement and postoperative orthodontic treatment" 21 : 332-338, 2010

8 Liou EJ, "Surgery-first accelerated orthognathic surgery:postoperative rapid orthodontic tooth movement" 69 : 781-785, 2011

9 Liou EJ, "Surgery-first accelerated orthognathic surgery:orthodontic guidelines and setup for model surgery" 69 : 771-780, 2011

10 전재호, "New bimaxillary orthognathic surgery planning and model surgery based on the concept of six degrees of freedom" 대한치과교정학회 43 (43): 42-52, 2013

11 황대석, "III급 부정교합에서 선수술 교정치료를 통한 양악 수술 후 안정성" 대한악안면성형재건외과학회 33 (33): 407-412, 2011

12 Kim YI, "Evaluation of intersegmental displacement according to osteosynthesis method for mandibular setback sagittal split ramus osteotomy using cone-beam computed tomographic superimposition" 70 : 2893-2898, 2012

13 Hwang DS, "Effect of intended manual condylar positioning on skeletal and dental changes in Skeletal Class III deformities: CBCTgenerated half-cephalograms" 42 : 7-12, 2014

14 Kang SH, "Early orthognathic surgery with three-dimensional image simulation during presurgical orthodontics in adults" 22 : 473-481, 2011