Quantitative Prediction of Change in Chin Position in Le Fort I Impaction

Jayakumar, Jayalakshmi; Jayakumar, N. D.; John, Bobby; Antony, P.G.

doi:10.1007/s12663-019-01298-7

Cited by 5 publications

(10 citation statements)

References 7 publications

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“…MAP has to date only been studied in the context of anterior vertical excess associated or not with class II malocclusion. In these studies, maxillary impaction was responsible for mandibular advancement and upward movement [ 21 ], but the patients studied were insufficiently characterized. No distinction was made between the type of maxillary movement surgery performed or type of vertical dysmorphosis.…”

Section: Discussionmentioning

confidence: 99%

“…Similar to our conclusions above, it does not seem appropriate to anticipate these labio-mental effects without analyzing divergence. Different teams have however attempted to correlate the maxillary impaction movements with the movements of cephalometric points [ 21 ]; no convincing conclusions were reached. Heterogeneity in data in the literature shows methodological inadequacy and/or the absence of comparability between the patient cohorts studied.…”

Section: Discussionmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

“…However, Chang et al [20] indicate that differences between study findings could be explained in part by the fact that the centre of mandibular rotation is still only a theoretical idea; the precise definition and location still thus remaining author dependant. Nonetheless, several studies suggest that any maxillary impaction induces chin impaction and advancement [21][22][23]. Maxillary impaction therefore tends to reduce facial height at the expense of increasing sagittal length, thus resulting in aggravation in progenia and often considered unattractive [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of labiomandibular movements induced after isolated LeFort I osteotomy in the surgical management of class III malocclusion

Passalboni,

Taverne,

Lopez

et al. 2023

PLoS ONE

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Introduction Maxillary surgery alone can be proposed for the surgical management of class III malocclusion, but anticipating outcomes for the labiomental muscle complex is challenging due to the mandibular autorotation phenomenon. The objective of this study was to quantify the mandibular and labiomental movements induced by maxillary osteotomy alone in the management of class III malocclusion according to different clinical and surgical variables. Methods The post-operative changes in mandibular and labiomental shapes were studied by geometric morphometry from the pre- and post-operative lateral cephalometric radiograph of 25 patients. The explanatory variables tested were maxillary advancement, maxillary rotation, and divergence. Results Soft tissues repositioning are different from postoperative mandibular repositioning after maxillary osteotomy. Neuromuscular adjustments of mandible depend on divergence and the maxillary rotation. Labiomental response only depends on divergence. Conclusion The surgical procedure does not have the same bone-related and musculocutaneous effects on patients with the same class III malocclusion. It is therefore essential for surgeons to understand the effects of their procedure on musculocutaneous tissues in order to best anticipate post-operative outcomes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of labiomandibular movements induced after isolated LeFort I osteotomy in the surgical management of class III malocclusion

Passalboni,

Taverne,

Lopez

et al. 2023

PLoS ONE

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“…[ 2 ] Another study advocated that the movement of maxilla in the superior direction has an effect on the repositioning of the chin in the anterior and cranial directions. [ 21 ]…”

Section: Discussionmentioning

confidence: 99%

Autorotation of the Mandible as Sequelae to Maxillary Intrusion

Reddy

Ibrahim

Bhardwaj

et al. 2021

Journal of Pharmacy and Bioallied Sciences

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Background: Autorotation of the mandible is a normally anticipated phenomenon following a surgical superior repositioning of the maxilla in clinical situations where patients have an excessive gummy smile. Prediction of the surgical treatment outcome following a presurgical orthodontic treatment is a critical element in the surgical treatment planning. Materials and Methods: The relevant articles were selected by hand search and electronic media (Google Scholar, PubMed, Science Direct, Medline, Embase, and Cochrane) from 1982 to 2020. All the relevant articles were properly screened, and findings were extracted from the articles. Results: It was observed that, following maxillary intrusion, mandible would eventually autorotate to take a new occlusion. Mandibular autorotation as a result of maxillary intrusion would lead to minimal shortening of the lower lip in the vertical plane. It was observed that the amount of mandibular autorotation correlates with the extent of maxillary impaction. Studies have shown that there is a passive soft-tissue response which may be attributed to the fact that no muscular detachment had been affected in the lower lip and soft-tissue chin region during the maxillary surgery. Conclusion: It is observed that there is a definite influence on the mandibular and chin positions as a result of maxillary intrusion and autorotation of the mandible. Every 1 mm of maxillary superior impaction, the chin moved 0.6 mm vertically and 0.2 mm horizontally. There is an appreciable shortening of the lower lip length.

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