Three-dimensional soft tissue analysis for the evaluation of facial asymmetry in normal occlusion individuals

Hwang, Hyun Tae; Yuan, Donghui; Jeong, Kweon Heui; Uhm, Gi Soo; Cho, Jin Hyoung; Yoon, Sook Ja

doi:10.4041/kjod.2012.42.2.56

Cited by 57 publications

(35 citation statements)

References 12 publications

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“…The current results agreed with other studies (2,4,28,29) . This finding also was confirmed by Hwang et al (30) , who demonstrated that the degree of facial asymmetry tended to increase with the lower and lateral positioning of landmarks. However, the present study disagreed with the study carried by Frakas and Cheung (31) , who found that the most asymmetric part of the face (69.2%) was the upper third .…”

Section: Discussionsupporting

confidence: 74%

Three-dimensional Evaluation of Facial Harmony in Orthodontic Patients with Vertical Growth Pattern

Fathalla¹,

Kadi²,

Nadim³

2017

Suez Canal University Medical Journal

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Aim: To three-dimensionally evaluate the facial harmony in orthodontic patients with vertical growth pattern. Materials and Methods: Cone-beam computed tomography (CT) scans were obtained in 10 normal occlusion adults (4 men, 6 women) with vertical growth pattern, and reconstructed into 3dimensional (3D) models by using a 3D image software. 3D position of 12 hard tissue landmarks, 3 midlines and 9 pairs of bilateral landmarks, were identified in 3D coordination system, and their right and left differences were calculated and analyzed. Results: The right and left difference values derived from the study indicated a degree of facial asymmetry in the vertical growers. The lateral ramal inclination was the most asymmetric value. Conclusions: A degree of facial asymmetry exists in the vertical growers. The lateral ramal inclination is a significant parameter in the assessment of facial asymmetry in the vertical growers. Facial asymmetry tends to increase according to the lower and lateral positioning of the landmarks in the face. There is a tendency towards left-side dominance.

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Section: Discussionsupporting

confidence: 74%

Three-dimensional Evaluation of Facial Harmony in Orthodontic Patients with Vertical Growth Pattern

Fathalla¹,

Kadi²,

Nadim³

2017

Suez Canal University Medical Journal

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“…43 Because of aging, which results in a decrease in soft tissue strength, the soft tissue change one year after surgery would have mixed effects. 6,44 We added the patient age and gender as predictor variables, which is one of the default design settings in biostatistics.…”

Section: Suh Et Al Predicting Soft Tissue Changes After Mandibular Smentioning

confidence: 99%

A More Accurate Method of Predicting Soft Tissue Changes After Mandibular Setback Surgery

Suh¹,

Lee²,

Lee³

et al. 2012

Journal of Oral and Maxillofacial Surgery

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Purpose: To propose a more accurate method to predict the soft tissue changes after orthognathic surgery. Patients and Methods: The subjects included 69 patients who had undergone surgical correction of Class III mandibular prognathism by mandibular setback. Two multivariate methods of forming prediction equations were examined using 134 predictor and 36 soft tissue response variables: the ordinary least-squares (OLS) and the partial least-squares (PLS) methods. After fitting the equation, the bias and a mean absolute prediction error were calculated. To evaluate the predictive performance of the prediction equations, a 10-fold cross-validation method was used. Results: The multivariate PLS method showed significantly better predictive performance than the conventional OLS method. The bias pattern was more favorable and the absolute prediction accuracy was significantly better with the PLS method than with the OLS method. Conclusions: The multivariate PLS method was more satisfactory than the conventional OLS method in accurately predicting the soft tissue profile change after Class III mandibular setback surgery.

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“…Several researchers have developed standard values for the normal range of asymmetry by obtaining bilateral differences of landmarks in rectangular coordinates for hard or soft tissue analysis on 3D CT 21,22,25,26. However, there has been no study on the normal range of asymmetry of facial lines.…”

Section: Discussionmentioning

confidence: 99%

Normal range of facial asymmetry in spherical coordinates: a CBCT study

Yoon

Wang

et al. 2013

Imaging Sci Dent

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PurposeThis study aimed to measure the bilateral differences of facial lines in spherical coordinates from faces within a normal range of asymmetry utilizing cone-beam computed tomography (CBCT).Materials and MethodsCBCT scans from 22 females with normal symmetric-looking faces (mean age 24 years and 8 months) were selected for the study. The average menton deviation was 1.01±0.66 mm. The spherical coordinates, length, and midsagittal and coronal inclination angles of the ramal and mandibular lines were calculated from CBCT. The bilateral differences in the facial lines were determined.ResultsAll of the study subjects had minimal bilateral differences of facial lines. The normal range of facial asymmetry of the ramal and mandibular lines was obtained in spherical coordinates.ConclusionThe normal range of facial asymmetry in the spherical coordinate system in this study should be useful as a reference for diagnosing facial asymmetry.

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Three-dimensional soft tissue analysis for the evaluation of facial asymmetry in normal occlusion individuals

Cited by 57 publications

References 12 publications

Three-dimensional Evaluation of Facial Harmony in Orthodontic Patients with Vertical Growth Pattern

Three-dimensional Evaluation of Facial Harmony in Orthodontic Patients with Vertical Growth Pattern

A More Accurate Method of Predicting Soft Tissue Changes After Mandibular Setback Surgery

Normal range of facial asymmetry in spherical coordinates: a CBCT study

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