Condylar head remodeling compensating for condylar head displacement by orthognathic surgery

Hwang, Hyeon-Shik; Jiang, Tingting; Sun, L.; Lee, Kyungmin Clara; Oh, Myounghak; Yan, Biao; Oh, Hee-Kyun; Bechtold, Till Edward

doi:10.1016/j.jcms.2018.11.029

Cited by 17 publications

(5 citation statements)

References 22 publications

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“…Consequently, bone resorption on the condyle of the nondeviated side might occur, resulting in improvement of the facial asymmetry. This finding was similar to that of a previous study 17 that demonstrated adaptive condylar resorption following functional loading force. The procedures for mandibular repositioning were performed gradually and cautiously over a long-term treatment period to provide sufficient time for bone remodeling and muscular adaptation.…”

Section: Discussionsupporting

confidence: 92%

Nonsurgical orthodontic correction of facial asymmetry by condylar remodeling and mandibular repositioning following occlusal cant correction with microimplants: a case report

Kim¹,

Noh²,

Park³

2022

The Angle Orthodontist

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Recently, the demand for correcting facial asymmetry has been increasing, even when the extent of asymmetry is small. This case report describes nonsurgical orthodontic treatment for facial asymmetry in a 13-year-old female patient, facilitated by moving the deviant mandible to the nondeviated side after correcting for relevant dental compensation using microimplants. Mandibular repositioning was attempted using intermaxillary elastics between the microimplants placed into each jaw and guided by resin that was bonded on the maxillary first molar of the deviated side. To enhance mandibular movement, correction of the transverse occlusal cant and buccolingual inclination of the teeth were also performed. After 65 months of gradual treatment, facial symmetry, with favorable occlusion and jaw function, was achieved. These satisfactory results, including a well-balanced face and good occlusal interdigitation, were well maintained at the 53-month follow-up. Direct and functional forces applied against deviant functional forces can reduce facial asymmetry by differential growth or modeling of the condyle.

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Section: Discussionsupporting

confidence: 92%

Nonsurgical orthodontic correction of facial asymmetry by condylar remodeling and mandibular repositioning following occlusal cant correction with microimplants: a case report

Kim¹,

Noh²,

Park³

2022

The Angle Orthodontist

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“…The previous experiments in adult rats have revealed that the repositioning of the mandibular condyle led to a reactivation of chondrogenesis in condylar cartilage which otherwise is at resting status, and nally results in increased bone formation [44]. Beside the animal experiments, the adaptive condylar remodeling in adult patients has been clari ed in the studies of 3D evaluation after orthognathic surgery because orthognathic surgery inevitably results in condylar positional changes [45]. So the adaptive capacities of the condyle may present throughout post-natal life and retain the potentiality of TMJ to regulate the equilibrium of maxillofacial system.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional mandibular changes associated with Class II elastics and extractions treatment in adult patients

Liu

2021

Preprint

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Backgroud: The apllication of Class II elastic can induce the rotation of mandible and condylar response. The purpose of this study was to assess the positional and morphological alterations of mandible after orthodontic treatment with Class II elastic by using of 3-dimensional superimposition of pretreatment (T1), posttreatment (T2) and after retention (T3) CBCT data. Methods: With sequential 3D superimpositions that combined cranial base superimpositions with regional mandibular superimpositions, the virtual reference mandibles were placed to distinguish morphological changes from positional changes. The morphological changes and positional changes of mandibles were measured by comparing multiple combinations of reference and original mandibles respectively, and the corresponding paired t test was performed using SPSS (IBM SPSS version 23). Results: During orthodontic treatment (T1-T2), the mandibular molars were extruded, and the condyles were revealed apparent adaptive remodeling and upward/backward displacements. The mandible rotated backwardly and drifted backwardly/downwardly. The condylar growth and displacements were significantly different. The condylar growth did not induce isometric displacements and the forward rotation was restricted. Two years after retention (T2-T3), continuous morphological and positional changes occurred. The condylar remodeling and forward/downward displacements induced forward mandibular rotation and neutralized the backward rotation during treatment period (T1-T2). The overall positional changes (T1-T3) were translations with slight rotation. Statistically significant differences were found between the treatment and overall variables regarding the 3D rotation, condylar displacement, Pog displacement. And with the continuous morphological and positional changes, the condyle moved back to the initial position after the retention stage.Conclusion: Conclusions: the sequential 3D superimposition method can produce the reference mandibles and distinguish the morphological changes from positional alterations. The class II elastics induced mandibular complex changes including condylar adaptive remodeling and 3D rotation and translation. The condyles morphologically adapted to resist the rotation effects of Class II elastic.

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“…There are limited volumetric analyses that studied condylar resorption as an outcome of class III orthognathic surgery. [11][12][13] The purpose of this study was to evaluate condylar displacement changes and the associated condylar remodeling in class III patients with facial asymmetry following mandibular setback surgery via SSRO.…”

mentioning

confidence: 99%

“…Angular and linear displacement changes in those studies were measured by using reference planes. There are limited volumetric analyses that studied condylar resorption as an outcome of class III orthognathic surgery 11–13…”

mentioning

confidence: 99%

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Three-Dimensional Quantitative Assessment of Condylar Displacement and Adaptive Remodeling in Asymmetrical Mandibular Prognathism Patients After Sagittal Split Ramus Osteotomy

Jha

Kim

Cevidanes

et al. 2022

Journal of Craniofacial Surgery

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This study was performed to evaluate the condylar displacement and associated condylar remodeling in class III patients following mandibular setback surgery via sagittal split ramus osteotomy (SSRO). The sample comprised of 26 condyles of 13 subjects (mean age of 21.2±2.6 y). We evaluated patients with mandibular prognathism and facial asymmetry who had undergone SSRO for mandibular setback at Korea University Hospital between January 2016 and December 2018. Three-dimensional segmentation of the mandibular condyles was done using the initial cone-beam computed tomography scan and scan taken 12 months postoperatively or later. Quantitative assessments of the 3-dimensional condylar displacement from T0 to T1 and bony remodeling of 8 regions of the condylar head were performed. The correlation between the condylar displacement and condylar head remodeling on the deviated (D) and nondeviated (ND) sides was analyzed. Significant correlations between condylar displacement and surface remodeling were observed in both D and ND condyles. The anteroposterior condylar displacement was significantly different between the D and ND sides ( P =0.007). There was no significant difference in condylar remodeling between the 2 sides. Condylar displacement and adaptive remodeling after SSRO varied greatly among individuals. Compared with displacement in the ND condyle, displacement in the D condyle has a greater association with condylar remodeling in both D and ND condyles. There is no significant difference in condylar head remodeling between D and ND condyles.

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Condylar head remodeling compensating for condylar head displacement by orthognathic surgery

Cited by 17 publications

References 22 publications

Nonsurgical orthodontic correction of facial asymmetry by condylar remodeling and mandibular repositioning following occlusal cant correction with microimplants: a case report

Nonsurgical orthodontic correction of facial asymmetry by condylar remodeling and mandibular repositioning following occlusal cant correction with microimplants: a case report

Three-dimensional mandibular changes associated with Class II elastics and extractions treatment in adult patients

Three-Dimensional Quantitative Assessment of Condylar Displacement and Adaptive Remodeling in Asymmetrical Mandibular Prognathism Patients After Sagittal Split Ramus Osteotomy

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