Changes in occlusal function after orthognathic surgery in mandibular prognathism with and without asymmetry

Moroi, Akinori; Ishihara, Yuri; Sotobori, Megumi; Iguchi, Ran; Kosaka, Akihiko; Ikawa, Hiroumi; Yoshizawa, Kunio; Marukawa, Kohei; Ueki, Koichiro

doi:10.1016/j.ijom.2015.03.015

Cited by 17 publications

(18 citation statements)

References 17 publications

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“…The new protocol to determine the true craniofacial symmetry plane has numerous clinical applications, namely (1) as a part of a true 3D cephalometric analysis protocol to assess craniofacial morphology, growth and asymmetry as demonstrated above; (2) determination of the orientation of dental occlusion plane relative to the craniofacial morphology; (3) quantification of mandibular asymmetry and biomechanical investigations in masticatory asymmetry [29], (4) it may also be useful for virtual surgical planning of mandibular reconstructions [30], and mandibular implant development [31]. The protocol is landmark free and allows the reliable determination of the true craniofacial symmetry against a gold standard model .…”

Section: Discussionmentioning

confidence: 99%

A 3D cephalometric protocol for the accurate quantification of the craniofacial symmetry and facial growth

Pinheiro

Fagan

et al. 2019

J Biol Eng

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Background Cephalometric analysis is used to evaluate facial growth, to study the anatomical relationships within the face. Cephalometric assessment is based on 2D radiographic images, either the sagittal or coronal planes and is an inherently inaccurate methodology. The wide availability of 3D imaging techniques, such as computed tomography and magnetic resonance imaging make routine 3D analysis of facial morphology feasible. 3D cephalometry may not only provide a more accurate quantification of the craniofacial morphology and longitudinal growth, but also the differentiation of subtle changes in occlusion. However, a reliable protocol for the computation of craniofacial symmetry and quantification of craniofacial morphology is still a topic of extensive research. Here, a protocol for 3D cephalometric analysis for both the identification of the natural head position (NHP) and the accurate quantification of facial growth and facial asymmetry is proposed and evaluated. A phantom study was conducted to assess the performance of the protocol and to quantify the ability to repeatedly and reliably align skulls with the NHP and quantify the degree of accuracy with which facial growth and facial asymmetry can be measured. Results The results obtained show that the protocol allows consistent alignment with the NHP, with an overall average error (and standard deviation) of just 0.17 (9.10e-6) mm, with variations of 0.21 (2.77e-17) mm in the frontonasal suture and 0.30 (5.55e-17) mm in the most prominent point in the chin. The average errors associated with simulated facial growth ranged from 1.83 to 3.75% for 2 years’ growth and from − 9.57 to 14.69% for 4 years, while the error in the quantification of facial asymmetry ranged from − 11.38 to 9.31%. Conclusions The protocol for 3D skull alignment produces accurate and landmark free estimation of the true symmetry of the head. It allows a reliable alignment of the skull in the NHP independently of user-defined landmarks, as well as an accurate quantification of facial growth and asymmetry.

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Section: Discussionmentioning

confidence: 99%

A 3D cephalometric protocol for the accurate quantification of the craniofacial symmetry and facial growth

Pinheiro

Fagan

et al. 2019

J Biol Eng

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“…41 The highest bite force is seen in the molar region, 46 with men exhibiting higher bite force than women. 44,47 No differences in MVBF 48 or ME 16 are seen between class II and III patient with DFD requiring OS. Therefore, factors such as the type of surgery, degree of deformity, TMD condition, bite force and ME should be considered while assessing the masticatory function.…”

Section: Discussionmentioning

confidence: 93%

“…Two third of our study population were skeletal class II patients and similar results were found with masticatory function at 2‐year follow‐up. On the other hand, significant occlusal bite force and ME improvements were reported in setback surgeries after 1‐year follow‐up 21,40–44 . The steady increase in masticatory function 25,41,42 over the follow‐up years could be due to the masseter muscle requiring time for adaptation to the new jaw position after surgery 21 .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, significant occlusal bite force and ME improvements were reported in setback surgeries after 1-year follow-up. 21,[40][41][42][43][44] The steady increase in masticatory function 25,41,42 over the follow-up years could be due to the masseter muscle requiring time for adaptation to the new jaw position after surgery. 21 The masseter muscle fibres may be stretched during the advancement surgery leading to a reduction in bite force.…”

Section: Discussionmentioning

confidence: 99%

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Associations between temporomandibular disorders, pain, jaw and masticatory function in dentofacial deformity patients: A cross‐sectional study

Madhan

Nascimento

Ingerslev

et al. 2023

J of Oral Rehabilitation

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Background and objective: Patients with dentofacial deformity often present with impaired masticatory function, orofacial pain and temporomandibular disorders (TMD). This study investigates the relationship between TMD, pain, jaw and masticatory function at different stages of orthognathic surgical (OS) treatment.Methods: A total of 120 OS patients were prospectively recruited and grouped as pre-orthodontic (group 1), pre-surgery (group 2), 4-month post-surgery (group 3), 24month post-surgery (group 4), in addition to 30 controls (group 0). Outcomes were assessed using: Jaw Function Limitation Scale (JFLS), McGill pain questionnaire, DC/ TMD instrument, voluntary maximum bite force (MVBF), and masticatory efficiency (ME) using two-coloured chewing gum. Data were analysed using structural equation modelling. Results:The prevalence of non-painful TMD did not differ between groups (p = .827).However, the prevalence of painful TMD differed between groups (p = .001). Among the painful TMDs, the highest prevalence was observed for masseter myalgia in group 2 (p = .031), and importantly group 4 did not differ from group 0 (p = .948). The MPQ score was significantly higher in group 1 (p = .001) compared to group 0, and the JFLS score was significantly higher in groups 1, 2 and 3 compared to group 0. Notably, | 747MADHAN et al.

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“…To date, most studies focused on studying the functional recovery with respect to sagittal malocclusion, whereas very few studies have assessed the transverse malocclusion or asymmetry. Moroi et al17 evaluated changes in the bite force and occlusal contact area after OGS in mandibular prognathism with and without asymmetry. The asymmetry group showed an improved balance in the bite force after surgery, but they also tended to show a delay in bite force recovery compared with that in the symmetry group.…”

Section: Introductionmentioning

confidence: 99%

Short-term changes in muscle activity and jaw movement patterns after orthognathic surgery in skeletal Class III patients with facial asymmetry

et al. 2019

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Objective To evaluate the short-term changes in masticatory muscle activity and mandibular movement patterns after orthognathic surgery in skeletal Class III patients with facial asymmetry. Methods Twenty-seven skeletal Class III adult patients were divided into two groups based on the degree of facial asymmetry: the experimental group (n = 17 [11 male and 6 female]; menton deviation ≥ 4 mm) and control group (n = 10 [4 male and 6 female]; menton deviation < 1.6 mm). Cephalography, electromyography (EMG) for the anterior temporalis (TA) and masseter muscles (MM), and mandibular movement (range of motion [ROM] and average chewing pattern [ACP]) were evaluated before (T0) and 7 to 8 months (T1) after the surgery. Results There were no significant postoperative changes in the EMG potentials of the TA and MM in both groups, except in the anterior cotton roll biting test, in which the masticatory muscle activity had changed into an MM-dominant pattern postoperatively in both groups. In the experimental group, the amount of maximum opening, protrusion, and lateral excursion to the non-deviated side were significantly decreased. The turning point tended to be shorter and significantly moved medially during chewing in the non-deviated side in the experimental group. Conclusions In skeletal Class III patients with facial asymmetry, the EMG activity characteristics recovered to presurgical levels within 7 to 8 months after the surgery. Correction of the asymmetry caused limitation in jaw movement in terms of both ROM and ACP on the non-deviated side.

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Changes in occlusal function after orthognathic surgery in mandibular prognathism with and without asymmetry

Cited by 17 publications

References 17 publications

A 3D cephalometric protocol for the accurate quantification of the craniofacial symmetry and facial growth

A 3D cephalometric protocol for the accurate quantification of the craniofacial symmetry and facial growth

Associations between temporomandibular disorders, pain, jaw and masticatory function in dentofacial deformity patients: A cross‐sectional study

Short-term changes in muscle activity and jaw movement patterns after orthognathic surgery in skeletal Class III patients with facial asymmetry

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