Three-dimensional characterization of mandibular asymmetry in craniofacial microsomia

Chen, Yunfang; Baan, Frank; Bruggink, Robin; Bronkhorst, Ewald M.; Liao, Yu‐Fang; Ongkosuwito, Edwin M.

doi:10.1007/s00784-020-03302-8

“…Pearson correlation results shows ramal linear measurement being decisive in expression of asymmetry in the form of positive linear correlation, as also shown by Chen Fang et al 26 According to Leung LY mandibular ramal asymmetry contributes largely to mandibular asymmetry along with mandibular body and chin point and lastly condylar growth. Condylar height values increased on the right side support the philosophy of dominant side which is not supported by evidence.…”

Section: Discussionsupporting

confidence: 52%

Vertical growth pattern as a determinant of mandibular asymmetry

Habib¹,

Ahsan²,

Majeed³

et al. 2022

View full text Add to dashboard Cite

Objectives: To determine normal mandibular linear values in three vertical groups, to compare right and left side to highlight a prevalent pattern towards mandibular asymettry. Methods: This is a descriptive cross sectional study in which pre-orthodontic treatment panoramic radiographs and lateral cephalograms of 224 patients (between 18 to 34 years) undergoing treatment in Orthodontic Department of Bahria University Medical and Dental College were used and traced on an acetate sheet. There were 74 patients in high angle,76 and 78 in low angle and normal angle group respectively based on their vertical growth pattern using SNMP angle. Condylar height (CH) and Ramal height (RH), and condylar plus ramal height (CH+RH) measurements were done as previously described by Habets. Results: There was no statistically significant difference between the three groups as determined by one way ANOVA. Condylar height and Gonial angle showed statistically significant difference when right and left side was compared, with increased values on the right side. Conclusion: There was no statistically significant difference in condylar, ramal, and total asymmetry index between different vertical groups. Between the right and left sides, condylar height and gonial angles were significantly increased on the right side. However, Ramal height showed no significant difference. Ramal index has a strong linear correlation with total asymmetry index. doi: https://doi.org/10.12669/pjms.38.5.5294 How to cite this:Habib M, Ahsan T, Majeed O, Faheem F. Vertical growth pattern as a determinant of mandibular asymmetry. Pak J Med Sci. 2022;38(5):---------. doi: https://doi.org/10.12669/pjms.38.5.5294 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

show abstract

“…The opening of the mandibular body relative to Me and the mandibular body height in skeletal class II male patients were greater than those in skeletal class I male patients, with no significant difference in these items in females. The growth of the mandibular body height mainly depends on the increase in the alveolar process height during the eruption of the mandibular teeth [ 30 ]. The reason might be that mandibular hypoplasia in skeletal class II males is more significantly affected by environmental factors, and the compensation of muscles and the alveolar process is the main cause.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Three-Dimensional Morphological Differences in the Mandible between Skeletal Class I and Class II with CBCT Fixed-Point Measurement Method

Dong

¹

,

Shi²,

Jia³

et al. 2021

View full text Add to dashboard Cite

This study was aimed at determining the three-dimensional differences in the mandible morphology between skeletal class I and II patients, at exploring the pathogenic mechanisms and morphological characteristics of skeletal class II, and at providing clinical references. The subjects were assigned to two groups according to the size of ANB angle: skeletal class I ( 2 ° < ANB angle < 5 ° ) and skeletal class II ( 5 ° < ANB angle < 8 ° ). After cone-beam computed tomography (CBCT) scanning, 31 landmarks and 25 measurement items were determined by In Vivo Dental 5.1 software (Anatomage, CA) for statistical analysis. The results were as follows: Co-Go, Go-Me, and CdM-CdD in skeletal class II cases were smaller than those in skeletal class I, and GoR-Me-GoL, GoR-Me-CoL, and, Ig-Men were larger than those in skeletal class I cases. In conclusion, there were significant differences in the three-dimensional morphology of the mandible between skeletal class I and class II patients. The vertical growth of the ramus, the horizontal growth of the mandibular body, and the condyle in skeletal class II patients were smaller than those in skeletal class I cases. In skeletal class II, the growth of the anterior part of the mandible in the vertical direction was larger than that in skeletal class I, and the shape of the mandible was more extended.

show abstract

“…To determine the sample size, the G-Power software (version 3.1.9.7; Franz Faul, University of Kiel, Kiel, Germany) was used. A minimum of 17 subjects per group was estimated based on our previous studies [17,18] by setting an effect size of 1.0, a significance level of 5% (p < 0.05), and a power of 80%.…”

Section: Discussionmentioning

confidence: 99%

Is the pattern of mandibular asymmetry in mild craniofacial microsomia comparable to non-syndromic class II asymmetry?

Chen

¹

,

Vinayahalingam

²

,

Bergé

³

et al. 2022

Clin Oral Invest

Self Cite

2

0

View full text Add to dashboard Cite

Objectives To compare the characteristics of mandibular asymmetry in patients with unilateral craniofacial microsomia (CFM) and class II asymmetry. Materials and methods Pretreatment cone-beam computed tomography of consecutive adults with Pruzansky-Kaban type I and IIA CFM (CFM group) was analyzed by 3D cephalometry. Fourteen mandibular landmarks and two dental landmarks were identified. The mandibular size and positional asymmetry were calculated by using landmark-based linear and volumetric measurements, in terms of asymmetry ratios (affected/non-affected side) and absolute differences (affected − non-affected side). Results were compared with non-syndromic class II with matched severity of chin deviation (Class II group). Statistical analyses included independent t test, paired t test, chi-square test, and ANOVA. Results CFM group (n, 21; mean age, 20.4 ± 2.5 years) showed significantly larger size asymmetry in regions of mandibular body, ramus, and condyle compared to Class II group (n, 21; mean age, 27.8 ± 5.9 years) (p < 0.05). The curvature of mandibular body was asymmetric in CFM. Regarding the positional asymmetry of mandibular body, while a comparable transverse shift and a negligible yaw rotation were found among the two groups, the roll rotation in CFM was significantly greater as well as the occlusal (6.06° vs. 4.17°) and mandibular (7.84° vs. 2.80°) plane cants (p < 0.05). Conclusions Mild CFM showed significantly more severe size asymmetry and roll rotation in mandible than non-CFM class II asymmetry. Clinical relevance To improve the mandibular size and positional asymmetry in CFM, adjunct hard tissue augmentation or reduction in addition to OGS orthodontics with a meticulous roll and yaw planning is compulsory, which is expected to be distinct from treating non-CFM class II asymmetry.

show abstract

Three-dimensional characterization of mandibular asymmetry in craniofacial microsomia

Cited by 12 publications

References 35 publications

Vertical growth pattern as a determinant of mandibular asymmetry

Vertical growth pattern as a determinant of mandibular asymmetry

Analysis of Three-Dimensional Morphological Differences in the Mandible between Skeletal Class I and Class II with CBCT Fixed-Point Measurement Method

Is the pattern of mandibular asymmetry in mild craniofacial microsomia comparable to non-syndromic class II asymmetry?

Contact Info

Product

Resources

About