Soft-tissue and dentoskeletal profile changes associated with mandibular setback osteotomy

Gjørup, Hans; Athanasiou, Athanasios E.

doi:10.1016/0889-5406(91)70068-8

Cited by 67 publications

(52 citation statements)

References 18 publications

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“…Therefore, soft tissue changes after MSS were more greatly expressed in the lower lip and chin than in the upper lip and mouth corner. These results were in accordance with the results of two-dimensional cephalometric studies [17][18][19] and 3D computed tomography studies. 6,20,21 In addition, the lips and mouth corners moved backward after MSS with an increasing gradient from the midline to the lateral area (Table 3).…”

Section: Changes Of the X Y And Z Coordinate Of Landmarks After Msssupporting

confidence: 82%

“…In addition, lower lip tension could be reduced after MSS and eventually resulted in decrease of the lower lip height and lower vermilion height (Stm-Li, 1.7 mm, P , .001, Table 5), which is consistent with Gjørup and Athanasiou. 18 Significant decreases in Stm-Me9 (3.8 mm, P , .001, Table 5) and Sn-Me9 (3.4 mm, P , .001, Table 5), not lower lip height (Sn-B9 and Stm-B9, P . .05, Table 5), seems to be attributable to MSS along with the maxillary occlusal plane, resulting in backward and upward movement of the chin.…”

Section: Changes Of the X Y And Z Coordinate Of Landmarks After Mssmentioning

confidence: 99%

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Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Lim¹,

Chu²,

Lee³

et al. 2010

The Angle Orthodontist

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Objective: To evaluate whether mandibular setback surgery (MSS) for Class III patients would produce gradients of three-dimensional (3D) soft tissue changes in the vertical and transverse aspects. Materials and Methods: The samples consisted of 26 Class III patients treated with MSS using bilateral sagittal split ramus osteotomy. Lateral cephalograms and 3D facial scan images were taken before and 6 months after MSS, and changes in landmarks and variables were measured using a Rapidform 2006. Paired and independent t-tests were performed for statistical analysis. Results: Landmarks in the upper lip and mouth corner (cheilion, Ch) moved backward and downward (respectively, cupid bow point, 1.0 mm and 0.3 mm, P , .001 and P , .01; alar curvature-Ch midpoint, 0.6 mm and 0.3 mm, both P , .001; Ch, 3.4 mm and 0.8 mm, both P , .001). However, landmarks in stomion (Stm), lower lip, and chin moved backward (Stm, 1.6 mm; labrale inferius [Li], 6.9 mm; LLBP, 6.9 mm; B9, 6.7 mm; Pog9, 6.7 mm; Me9, 6.6 mm; P , .001, respectively). Width and height of upper and lower lip were not altered significantly except for a decrease of lower vermilion height (Stm-Li, 1.7 mm, P , .001). Chin height (B9-Me9) was decreased because of backward and upward movement of Me9 (3.1 mm, P , .001). Although upper lip projection angle and Stm-transverse projection angle became acute (Ch Rt -Ls-Ch Lt , 5.7u; Ch Rt -Stm-Ch Lt , 6.4u, both P , .001) because of the greater backward movement of Ch than Stm, lower lip projection angle and Stm-vertical projection angle became obtuse (Ch Rt -Li-Ch Lt , 10.8u; LsStm-Li, 23.5u, both P , .001) because of the larger backward movement of Li than labrale superius (Ls). Conclusions: Three-dimensional soft tissue changes in Class III patients after MSS exhibited increased gradients from upper lip and lower lip to chin as well as from Stm to Ch. (Angle Orthod. 2010;80:896-903.)

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Section: Changes Of the X Y And Z Coordinate Of Landmarks After Msssupporting

confidence: 82%

Section: Changes Of the X Y And Z Coordinate Of Landmarks After Mssmentioning

confidence: 99%

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Lim¹,

Chu²,

Lee³

et al. 2010

The Angle Orthodontist

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“…Previous reports [2][3][4] have indicated that mandibular setback might have an effect on the upper lip. This effect may have influenced the result in the non-open-bite groups, in particular, having greater setbacks and to some extent disguised the effect of the maxillary advancement.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies [2][3][4][5] have reported ratios close to 1:1 for soft to hard tissue change after mandibular setback surgery. Investigations [6][7][8][9][10] of the soft tissue response after isolated maxillary advancement have reported a wide range of ratios (0.3:1 to 0.9:1) for upper lip change to maxillary movement with weak correlations.…”

Section: Introductionmentioning

confidence: 99%

Importance of the vertical incisor relationship in the prediction of the soft tissue profile after Class III bimaxillary surgery

Jakobsone

Stenvik

Espeland

2012

The Angle Orthodontist

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Objective: To quantify the relative soft tissue profile response to the skeletal changes resulting from bimaxillary surgery to correct Class III malocclusion in patients with different vertical incisor relationships presurgery. Materials and Methods: The sample comprised lateral cephalograms of 80 consecutive patients before and 2 months after surgery. All patients had one-piece Le Fort I and bilateral sagittal split osteotomies. Patients were divided in three subgroups according to their preoperative characteristics, as follows: (1) open-bite patients, (2) patients with positive overbite and the upper lip resting on upper incisors, and (3) patients with positive overbite and the upper lip resting on lower incisors (lipblock). Trimmed means of soft to hard tissue ratios were calculated for the subgroups. Regression analyses were performed to examine factors influencing the soft tissue changes. Results: There were strong correlations between the horizontal movement of upper incisors and upper lip in patients with open bite (r 5 0.77) and in patients with positive overbite and upper lip resting on upper incisors (r 5 0.85). The upper lip followed the maxilla with a ratio of 0.5:1. In patients with lip-block, the association between maxillary repositioning and upper lip changes was weak. In all groups a strong association between horizontal soft and hard tissue changes was observed for the lower lip and chin, but the pattern differed depending on the vertical movement of the mandible. Conclusions: In the prediction of soft tissue response it is important to take into account the vertical incisor relationship, particularly in patients with lip-block. (Angle Orthod. 2012;82:441-447.)

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“…22 Some authors hypothesized that the thickness and posture of presurgical soft tissue may affect the post-treatment position of the upper lip. 23 The relation of incisors before the surgery should also be considered. Several factors may contribute to the postoperative position of the lower lip.…”

mentioning

confidence: 99%

Reply to the Letter to the Editor on the article “Soft tissue profile changes after mandibular setback surgery” (Dent Med Probl 2016, 53, 4, 447–453)

Bogusiak¹

2017

Dent. Med. Probl.

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Soft-tissue and dentoskeletal profile changes associated with mandibular setback osteotomy

Cited by 67 publications

References 18 publications

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Importance of the vertical incisor relationship in the prediction of the soft tissue profile after Class III bimaxillary surgery

Reply to the Letter to the Editor on the article “Soft tissue profile changes after mandibular setback surgery” (Dent Med Probl 2016, 53, 4, 447–453)

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