Horizontal changes in the condylar head after sagittal split ramus osteotomy with bent plate fixation

Ueki, Koichiro; Degerliyurt, Kagan; Hashiba, Yukari; Marukawa, Kohei; Nakagawa, Kiyomasa; Yamamoto, Etsuhide

doi:10.1016/j.tripleo.2008.03.016

Cited by 60 publications

(29 citation statements)

References 19 publications

(20 reference statements)

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“…9 In our previous study using CT, we also did not observe significant changes in condylar position or angle, but the gap between the proximal and distal segment created by the bent plate might reduce stress on the TMJ. 10 It is unclear whether bone healing could complete without bony contact between the proximal and distal segments. For fracture surgery, Perren and other members of the ASIF/AO School 11,12 state that compression of the fragments is essential to primary bone healing.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Bone Formation After Sagittal Split Ramus Osteotomy With Bent Plate Fixation Using Computed Tomography

Ueki

Hashiba

Marukawa

et al. 2009

Journal of Oral and Maxillofacial Surgery

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Purpose. The purpose of this study was to evaluate bone formation between the proximal and distal segments after a sagittal split ramus osteotomy (SSRO) with bent plate fixation.Subjects and Methods. The subjects were 23 patients (46 sides) who underwent bilateral SSRO setback surgery. They were divided into titanium and absorbable plate groups. A 3-7 mm gap was made between the proximal and distal segments and a bent plate was fixed with 4 screws in each side of the mandible. The square of ramus (RmS), the antero-posterior length (RmA-RmP), and the medio-lateral width (RmM-RmL) of the ramus at the horizontal plane under the mandibular foramen were assessed preoperatively, immediately after surgery, and 1 year postoperatively by computed tomography (CT).Results. There were no significant differences between the titanium and absorbable plate groups over time. RmS after 1 year was larger than pre-operatively in both groups (P<0.0001). RmA-RmP significantly increased immediately after surgery and significantly decreased after 1 year in both groups (P<0.0001). RmA-RmP after 1 year was significantly larger than the preoperative value in both groups (P<0.0001). RmM-RmL showed a similar tendency to the antero-posterior length, but was not significant. Conclusion.The gap between the proximal and distal segments can fill with new bone after SSRO with both titanium and absorbable plates, even with few bony contacts between segments.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Bone Formation After Sagittal Split Ramus Osteotomy With Bent Plate Fixation Using Computed Tomography

Ueki

Hashiba

Marukawa

et al. 2009

Journal of Oral and Maxillofacial Surgery

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“…Although many methods 7,8,[21][22][23] to prevent condylar displacement have been reported, few studies are available regarding the factors influencing condylar displacement after SSRO. Harris et al 6 and Lee and Park 9 evaluated condylar displacement by SSRO in three dimensions by means of helical CT and correlated with the amount of mandibular advancement 6 or setback.…”

Section: Discussionmentioning

confidence: 99%

“…Although the changes in condyle position were obvious, influencing factors were not revealed in their study. Ueki et al 7,8 reported that condylar rotation after SSRO could be reduced considerably with the use of bent plates. They also demonstrated that the frequency of temporomandibular disorders after surgery in the bent-plate group was significantly less than that in the conventional straight-plate group.…”

Section: Introductionmentioning

confidence: 99%

Cone-beam computed tomography evaluation on the changes in condylar long axis according to asymmetric setback in sagittal split ramus osteotomy patients

Lim

Jiang

et al. 2016

The Angle Orthodontist

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Objective: To determine whether the condylar rotation is affected by asymmetric setback in patients undergoing sagittal split ramus osteotomy. Materials and Methods: Thirty patients who underwent bilateral sagittal split ramus osteotomy setback surgery were divided into the two groups, symmetric setback and asymmetric setback, according to the right/left difference of setback amount (,2.0, !2.0 mm). Condylar long axis changes were evaluated using the three-dimensional superimposition of before and immediately after surgery cone-beam computed tomography volume images. Evaluations were performed separately in lesser setback and greater setback side in patients undergoing asymmetric setback, whereas both side condyles were evaluated together in patients undergoing symmetric setback. Condylar axis changes on axial view were correlated with setback amount or right/left setback difference using Pearson correlation analysis. Results: In general, the condylar axis change occurred in a pattern of inward rotation. The condyles in patients undergoing symmetric setback showed 3.48 rotation in average. In case of asymmetric setback, the lesser setback side showed larger value (4.38) than the greater setback side (2.38) with a statistical significance. In the correlation analysis, setback amount showed no significant correlation with the condylar axis changes in both groups. However, correlation with right/left setback difference showed a positive correlation in lesser setback side of patients undergoing asymmetric setback. Conclusion: The findings of this study indicate that large amount of setback alone does not contribute to the change in condylar long axis, but asymmetric setback might cause a change in condylar long axis, particularly on the lesser setback side. (Angle Orthod. 2017;87:254-259)

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“…This postoperative increase in ramus might partially depend on our surgical method reported previously. 21 In this method, the gap between the proximal and distal segment is created by a bent plate, preventing formation of a large bony contact.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore the gap was created between the osteotomy surfaces on both sides ( Fig.1). 21 Mean setback amount was right 6.2±3.0mm and left 6.6±3.2mm.…”

Section: Surgerymentioning

confidence: 91%

Assessment of ramus, condyle, masseter muscle, and occlusal force before and after sagittal split ramus osteotomy in patients with mandibular prognathism

Ueki

Okabe

Mukozawa

et al. 2009

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, an

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Assessment of ramus, condyle, masseter muscle, and occlusal force before and after sagittal split ramus osteotomy in patients with mandibular prognathism 2 Assessment of ramus, condyle, masseter muscle, and occlusal force before and after sagittal split ramus osteotomy in patients with mandibular prognathism Abstract Purpose: The purpose of this study was to examine the relationship between the morphologies of the masseter muscle and the ramus and occlusal force before and after sagittal split ramus osteotomy (SSRO) in patients with mandibular prognathism. Patients and Methods:The study group consisted of 26 patients with mandibular prognathism. All patients underwent bilateral SSRO as well as three-dimensional computed tomography and masseter muscle, ramus and condyle were measured preoperatively and at 1 year postoperation. Occlusal force and contact area were also recorded with pressure-sensitive sheets. Results:In the cross-sectional area of the masseter muscle, there were no significant differences between the pre and postoperative statuses. However, postoperative ramus width and area were significantly larger than preoperative values (P<0.0001). Postoperative right condylar area was significantly larger than the preoperative value (P=0.0120).Occlusal force and contact area 1 year after surgery were significantly larger than the preoperative values (P=0.0016, P=0.0190).Conclusion: This study suggested that the masseter muscle area did not significantly differ from preoperative status 1 year after SSRO, although occlusal force, contact area and ramus area and width increased significantly 1 year after SSRO.

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Horizontal changes in the condylar head after sagittal split ramus osteotomy with bent plate fixation

Cited by 60 publications

References 19 publications

Evaluation of Bone Formation After Sagittal Split Ramus Osteotomy With Bent Plate Fixation Using Computed Tomography

Evaluation of Bone Formation After Sagittal Split Ramus Osteotomy With Bent Plate Fixation Using Computed Tomography

Cone-beam computed tomography evaluation on the changes in condylar long axis according to asymmetric setback in sagittal split ramus osteotomy patients

Assessment of ramus, condyle, masseter muscle, and occlusal force before and after sagittal split ramus osteotomy in patients with mandibular prognathism

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