Soft tissue changes after a mandibular osteotomy for symmetric skeletal class III malocclusion

Ohba, Seigo; Kohara, Haruka; Koga, Takanori; Kawasaki, Tatsuya; Miura, Keiji; Yoshida, Noriaki; Asahina, Izumi

doi:10.1007/s10266-016-0280-3

Cited by 9 publications

(8 citation statements)

References 18 publications

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“…This tendency was similar to a previous study. 13 Thus, discussing this change with the patient should be important before surgery. However, this region was affected by the axis and position of the maxillary anterior teeth and may have been affected by postoperative orthodontic treatment.…”

Section: Discussionmentioning

confidence: 99%

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Occlusal Plane Angle as a Key Factor for Chin Protrusion After Mandibular Osteotomy in Skeletal Class III

Shido,

Morita,

Nishioka-Sakamoto

et al. 2023

Journal of Craniofacial Surgery

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There is no treatment algorithm to decide whether maxillomandibular or mandibular osteotomy alone should be performed in borderline cases. This study assessed the factors that affect the changes in soft tissue after mandibular setback. Patients who underwent mandibular osteotomy alone to correct mandibular protrusion were included in this study. Hard and soft tissue analyses were performed on lateral cephalograms before and 12±3 months after surgery. The popular points were set for referencing hard and soft tissues on the lateral cephalogram. Nasolabial, labiomental, and soft tissue facial plane angles were measured for the soft tissue assessment. To assess the mandibular setback amount, SNB was calculated. Twenty-one patients were included in this study. The nasolabial angle was increased after surgery and its change significantly correlated with the change in SNB (P=0.00815). The change in soft tissue facial plane angle after surgery per change in SNB significantly correlated with the occlusal plane angle (P=0.0009). An occlusal plane angle of at least 15.45 degrees was required for the SNB and soft tissue facial plane angle to change to the same degree. The occlusal plane angle (whether or not it was ≥15.45 degrees) may help in determining the surgical approach in borderline cases, specifically on whether maxillomandibular or mandibular osteotomy alone should be performed if the mandibular setback is simple.

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Section: Discussionmentioning

confidence: 99%

“…The line wherein S-N rotated by 7 degrees with S as the fulcrum was referred to as the x axis, as previously described. 13 The perpendicular line to the x axis which go through S was referred to as the y axis, as previously described. 14 This x-y coordinate was used to assess the change in points.…”

Section: Cephalometric Analysismentioning

confidence: 99%

Occlusal Plane Angle as a Key Factor for Chin Protrusion After Mandibular Osteotomy in Skeletal Class III

Shido,

Morita,

Nishioka-Sakamoto

et al. 2023

Journal of Craniofacial Surgery

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“…Modifications of the nasolabial angle determine the esthetic assessment of the area (van Loon et al, 2015). Ohba et al (2017), in a study of subjects with a class III facial deformity who underwent orthognathic surgery, found that a greater mandibular retrusion in the postoperative stage is associated with a greater nasolabial angle. For their part, Tiwari et al (2018), analyzing 3D photos obtained 12 months after orthognathic surgery, showed a relation between 1 mm of maxillary advancement with increase in average of 1.81º in the nasolabial angle and between 1 mm of maxillary regression related to a decrease of 2.73º in this angle.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional Analysis of Nasolabial Soft Tissues While Smiling Using stereophotogrammetry (3dMDTM)

et al. 2019

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The nasolabial region is the central esthetic unit of the face and is considered one of the most important determinants of the facial esthetic. The facial morphometry of soft tissues is a very important tool in facial surgery. Advances have been made recently in the capture and analysis of 3D images, which offer great development potential in the diagnosis and treatment of facial deformities. The aim of this study was to characterize the nasolabial region of patient candidates for orthognathic surgery using 3D facial captures. A study was conducted to characterize the width of the nasal base and the nasolabial angle in adult patients through 3D photographs. 30 subjects were included, taking two 3D photos each, one in a resting position and the other smiling. The three-dimensional capture was done with the 3dMDface System. The measurements were taken with the 3dMD Vultus software. The length of the alar base was an average of 34.3 ± 2.6 mm at rest, and 39.1 ± 2.9 mm smiling. The mean of the nasolabial angle was 104.6 ± 9.6° at rest and 105.4 ± 14.3º smiling. Additionally, the distance of the alar base smiling compared to its distance at rest increased an average of 4.83 mm, whereas the nasolabial angle smiling increased an average of 0.8º compared to at rest. In this study, the nasolabial angle did not present any significant changes so that its assessments in the case of facial modifications can be standard; the width of the nasal base is significantly modified with the smile and thus a more intense study of any type of modification in this area is required.

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“…[1][2][3] Estimation of the change in soft tissue esthetics after orthog-nathic surgery is generally performed by lateral cephalograms, lateral photographs and 3-dimensional lateral images but patients generally evaluate themselves based on how they look in the mirror. 1,2,4 Frontal view, also called "social profile," affects the perception of social attractiveness more than the profile view. 1,3,5 The esthetics of the submental-cervical region can affect the perceived esthetics of the face in profile and frontal views therefore esthetics of this region should be evaluated both in isolation and together with other parts of the face.…”

mentioning

confidence: 99%

“…One of the purposes of orthodontic treatment and orthognathic surgery is to improve the soft tissue esthetics 1–3. Estimation of the change in soft tissue esthetics after orthognathic surgery is generally performed by lateral cephalograms, lateral photographs and 3-dimensional lateral images but patients generally evaluate themselves based on how they look in the mirror 1,2,4. Frontal view, also called “social profile,” affects the perception of social attractiveness more than the profile view 1,3,5…”

mentioning

confidence: 99%

The Effect of Orthognathic Surgery on the Hourglass Appearance of the Neck

Gülsever

Suzen

Uçkan

2022

Journal of Craniofacial Surgery

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In frontal view, the transition from the upper aspect of the neck to the inferior border of the mandible has a subtle hourglass appearance. The aim of this study was to evaluate the effect of the orthognathic surgery on the hourglass appearance of the neck in patients with Class II dentofacial deformity. Twenty-six patients with Class II dentofacial deformity who underwent bilateral sagittal split osteotomy alone or in combination with Le Fort I osteotomy and/or genioplasty were included in this study. The width of the most upper part, the width of the narrowest part, the length of the upper part, the height of the upper part, the depth, and the angle of the hourglass were measured on frontal facial photographs obtained preoperatively and at sixth months postoperatively. The decrease in the width of the narrowest part (P=0.012) and the right (P<0.001) and left (P<0.001) angles of the hourglass were statistically significant. Also, increase in the right (P=0.036) and the left (P=0.004) depths of the hourglass were statistically significant. Orthognathic surgery procedures performed to correct Class II dentofacial deformity positively affects the hourglass appearance of the neck, therefore neck esthetics should also be considered in the preoperative evaluation of facial esthetics.

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Soft tissue changes after a mandibular osteotomy for symmetric skeletal class III malocclusion

Cited by 9 publications

References 18 publications

Occlusal Plane Angle as a Key Factor for Chin Protrusion After Mandibular Osteotomy in Skeletal Class III

Occlusal Plane Angle as a Key Factor for Chin Protrusion After Mandibular Osteotomy in Skeletal Class III

Three-dimensional Analysis of Nasolabial Soft Tissues While Smiling Using stereophotogrammetry (3dMDTM)

The Effect of Orthognathic Surgery on the Hourglass Appearance of the Neck

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