Vertical bony step between proximal and distal segments after mandibular setback is related with relapse: A cone-beam computed tomographic study

Batbold, Myagmarsuren; Lim, Sung Hoon; Jeong, Seo-Rin; Oh, Jaewon; Kim, Su-Jung; Kim, Inah; Cho, Jin-Hyoung; Kang, Kyung‐Hwa; Kim, Min Ji; Hong, Mihee; Sung, Si‐Young; Kim, Young Ho; Park, Jae Hyun; Baek, Seung‐Hak

doi:10.1016/j.ajodo.2021.10.016

Cited by 4 publications

(5 citation statements)

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“…The second limitation is that Pog was the only measurement. Other measurements, such as the maxillary occlusal plane 27 , vertical bony step 28 and points A, B, etc., should be addressed in future studies.…”

Section: Discussionmentioning

confidence: 99%

The prediction of sagittal chin point relapse following two-jaw surgery using machine learning

Kim,

Kim

et al. 2023

Sci Rep

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The study aimed to identify critical factors associated with the surgical stability of pogonion (Pog) by applying machine learning (ML) to predict relapse following two-jaw orthognathic surgery (2 J-OGJ). The sample set comprised 227 patients (110 males and 117 females, 207 training and 20 test sets). Using lateral cephalograms taken at the initial evaluation (T0), pretreatment (T1), after (T2) 2 J-OGS, and post treatment (T3), 55 linear and angular skeletal and dental surgical movements (T2-T1) were measured. Six ML modes were utilized, including classification and regression trees (CART), conditional inference tree (CTREE), and random forest (RF). The training samples were classified into three groups; highly significant (HS) (≥ 4), significant (S) (≥ 2 and < 4), and insignificant (N), depending on Pog relapse. RF indicated that the most important variable that affected relapse rank prediction was ramus inclination (RI), CTREE and CART revealed that a clockwise rotation of more than 3.7 and 1.8 degrees of RI was a risk factor for HS and S groups, respectively. RF, CTREE, and CART were practical tools for predicting surgical stability. More than 1.8 degrees of CW rotation of the ramus during surgery would lead to significant Pog relapse.

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Section: Discussionmentioning

confidence: 99%

The prediction of sagittal chin point relapse following two-jaw surgery using machine learning

Kim,

Kim

et al. 2023

Sci Rep

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“…This may be because multiple factors are known to be involved in mandibular relapse, such as condylar displacement, vertical bony step, occlusion, late mandibular growth and muscles, which are potential risk factors for mandibular relapse. 28,29 Since Proffit et al 19…”

Section: Discussionmentioning

confidence: 99%

“…In G1,the amount of setback (−11.5 mm) was associated with MXOP relapse (p < 0.05), while that of relapse (+1.6 mm) was not. This may be because multiple factors are known to be involved in mandibular relapse, such as condylar displacement, vertical bony step, occlusion, late mandibular growth and muscles, which are potential risk factors for mandibular relapse 28,29 …”

Section: Discussionmentioning

confidence: 99%

“…The limitation of the present study is 2D analysis. In future, 3D analysis is required including vertical bony step‐associated relapse in the mandible 29 …”

Section: Discussionmentioning

confidence: 99%

“…The limitation of the present study is 2D analysis. In future, 3D analysis is required including vertical bony step-associated relapse in the mandible 29. CON CLUS IONThe greater the amount of CW rotation of the MXOP during 2J-OGS in skeletal Class III patients, the greater the relapse (CCW rotation) of the MXOP.…”

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confidence: 99%

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Stability of clockwise rotation of the maxillary occlusal plane in skeletal Class III patients treated with two‐jaw surgery

Kang

Kim

Baek

et al. 2022

Orthod Craniofacial Res

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Introduction: To investigate the post-surgical stability of clockwise rotation of the maxillary occlusal plane (MXOP) after Le Fort I osteotomy for posterior impaction and advancement in skeletal Class III patients who had undergone two-jaw orthognathic surgery (2J-OGS).Materials and methods: Sample set consisted of 46 patients [18 males and 28 females]. Using lateral cephalograms taken at the initial (T0), before 2J-OGS (T1), after (T2), and at debonding (T3), The amount of MXOP change (criterion: 2° in ΔMXOP between T2-T3) was used to assign patients to Group1[G1, high relapse, 3.09°] or Group2 [G2, low relapse, -0.99°]. Statistical analyses were then performed.Results: Compared to G2, G1 exhibited more severe skeletal Class III relationships and a atter MXOP at T0, a greater increase in ΔANB, and more clockwise rotation of ΔMXOP and ΔFMA during T1-T2, as well as a greater decrease in ΔANB, higher counterclockwise rotation of ΔMXOP, and upward movement of U1 during T2-T3. Regression analysis resulted in formulation of the following equation: MXOP(ΔT2-T3) = -0.37 X MXOP(ΔT1-T2) -0.43.Conclusions: The higher the clockwise rotation of the MXOP during 2J-OGS in skeletal Class III patients, the greater the relapse (counterclockwise rotation) in the MXOP.

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Early and 1-year postsurgical stability and its factors in patients with complicated skeletal Class Ⅲ malocclusion treated by conventional and surgery-first approach: A prospective cohort study

Jiang

Zhong-peng

et al. 2023

American Journal of Orthodontics and Dentofacial Orthopedics

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Vertical bony step between proximal and distal segments after mandibular setback is related with relapse: A cone-beam computed tomographic study

Cited by 4 publications

References 33 publications

The prediction of sagittal chin point relapse following two-jaw surgery using machine learning

The prediction of sagittal chin point relapse following two-jaw surgery using machine learning

Stability of clockwise rotation of the maxillary occlusal plane in skeletal Class III patients treated with two‐jaw surgery

Early and 1-year postsurgical stability and its factors in patients with complicated skeletal Class Ⅲ malocclusion treated by conventional and surgery-first approach: A prospective cohort study

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