Comparison of soft tissue chin thickness in adult patients with various mandibular divergence patterns in Kodava population

Somaiah, Sanju; Khan, MU; Muddaiah, Sunil; Shetty, Balakrishna; Reddy, G. Sridhar; Siddegowda, Roopa

doi:10.4103/ijor.ijor_38_16

Cited by 6 publications

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“…The paradigm of modern teleroentgenographic diagnostics is being shifted to the point of considering just the aesthetic criteria, and not just the dental ones. After all, the profile of the face depends not only on the bone fundament [18], but also on the thickness of soft tissues, muscle tone, the presence of subcutaneous adipose tissue, and others [2,4,17,27,29].…”

Section: Introductionmentioning

confidence: 99%

Determination of individual teleroentgenographic characteristics of the face profile in ukrainian young men and girls with orthognathic bite

Dmitriev

2018

Biomed. and Biosoc. Anthrop.

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Modern dentistry requires the definition of individualized values of teleroentgenographic indicators. To solve such problems, methods of regression and correlation analysis are increasingly used, which help to establish not only the existence of various relationships between the anatomical structures of the head and the parameters of the dento-jaw system, but also allow more accurately predict the change in the contour of soft facial tissue in response to orthodontic treatment. The purpose of the study is to develop mathematical models for the determination of individual teleroentgenographic characteristics of the facial soft tissues by studying the cephalometric indices of young men and women of Ukraine with normal occlusion and balanced faces and conducting a direct stepwise regression analysis. With the use of Veraviewepocs 3D device, Morita (Japan) from 38 young men (17 to 21 years of age) and 55 young women (aged from 16 to 20 years) with occlusal close to the orthognathic bite and balanced faces received side teleroentgenograms. The cephalometric analysis was performed using OnyxCeph³™ licensed software. Cephalometric points and measurements were made according to the recommendations of Downs W. B., Holdway R. A., McNamara J., Schwarz A. M., Schmuth G. P. F., Steiner C. C. and Tweed C. H. With the help of direct stepwise regression analysis, in the licensed package “Statistica 6.0”, regression models of individual teleroentgenographic characteristics of the profile of soft facial tissues were constructed. In young men with normal occlusion close to the orthognathic bite of 19 possible models, 11 were constructed with a determination coefficient from 0.638 to 0.930, and in young women – 12 models with a determination coefficient from 0.541 to 0.927. The conducted analysis of models showed that in young men most often the regression equations included – angle N_POG, parameters of which indicate a linear interjaw relation in the anterior-posterior direction (14.0%); angle GL_SNPOG, or index of convexity of the soft tissue profile (8.8%); MAX maxillary length (7.0%), and GL_SN_S index, which defines vertical correlations in the facial profile (5.3%). The young women most often models included – the angle N_POG (12.5%); angle GL_SNPOG (7.5%); soft tissue front angle P_OR_N (6.25%); the reference angle ML_NL and the profile angle T (by 5.0%); the angle AB_NPOG, the angle NBA_PTGN, which defines the direction of development of the mandible and the distance PN_A (3.75%). Thus, in the work with the help of the method of stepwise regression with inclusion, among Ukrainians of adolescence age, based on the characteristics of teleroentgenographic indicators, reliable models of individual teleroentgenographic characteristics of the profile of soft facial tissues were developed and analyzed.

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Section: Introductionmentioning

confidence: 99%

Determination of individual teleroentgenographic characteristics of the face profile in ukrainian young men and girls with orthognathic bite

Dmitriev

2018

Biomed. and Biosoc. Anthrop.

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Soft-Tissue Analysis of Different Sagittal Skeletal Patterns Using the Geometric Morphometric Method

et al. 2022

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Objectives This study aimed to investigate the size and shape variations of soft-tissue patterns in different sagittal skeletal patterns using the geometric morphometrics method (GMM) obtained from lateral cephalograms. Materials and Methods This is a retrospective study, where the sample comprised of 188 Malaysian Malay subjects aged between 18 and 40 years and with different sagittal skeletal patterns. Overall, 71 males and 117 females were gathered for all size and shape analyses. This study incorporated 11 soft-tissue landmarks, which underwent landmark application using tpsDig2 software version 2.31, while the shape analysis was done using MorphoJ software version 1.07a. Statistical Analysis Statistical analyses were performed using IBM SPSS Statistics 26. The result of the analysis of variance (ANOVA) test showed significant differences in some of the parameters between the landmarks. Length D, Length E, Length F, Length H, and Length I showed significant differences (p < 0.05), while other parameters showed no difference (p > 0.05). Results The shape variation of soft-tissue landmarks in different skeletal patterns existed in 18 different dimensions which showed by 18 principal components (PCs). Procrustes ANOVA and canonical variate analysis showed the size and shape differences of soft-tissue patterns between Class II and III and gender groups (p < 0.0001). In discriminant function analysis for Class II subjects, the classification accuracy was 98.4%, whereas subsequent to cross-validation, the classification accuracy was 90.6%. For Class III subjects, the classification accuracy was 96.6%, while after cross-validation, the classification accuracy was 90%. Conclusion Different sagittal skeletal patterns demonstrated different soft-tissue shape variations. Class III showed the most protrusive upper and lower lips, while Class II demonstrated the most retrusive lower lip.

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Balance and thickness of soft tissue of the lower third of the face in different vertical patterns of growth

Janosevic

2022

Srp Arh Celok Lek

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Introduction/Objective. Variations in thickness of soft tissues can influence the position of facial structures as well as facial aesthetics. The objective of the study was to determine whether the frequency of soft tissues imbalance depends on the vertical growth pattern of the face. Methods. The present study consisted of 90 pretreatment lateral cephalograms of adult Serbian Caucasian orthodontic patients (30 male and 60 female), between 18 - 27 years of age, average 23.6 years. Only the patients with the skeletal class I, based on the values of ANB angle and Wits appraisal, were chosen for the study. All patients were divided into three groups of 30 patients, those with hyperdivergent, hypodivergent and normal vertical growth patterns based on the values of Frankfort mandibular plane angle (FMA). Soft tissue of each patient was evaluated following the method given by Merrifield. Results. The obtained results showed that soft tissues of the chin and upper lip were thickest in hypodivergent and thinnest in patients with hyperdivergent growth type. The largest number of patients with soft tissue imbalance was observed in the normal and hyperdivergent vertical growth pattern groups, eight out of 30 patients. The number of patients with imbalance greater than 3mm was largest in the group with hyperdivergent growth pattern. Conclusion. The pathological skeletal pattern of growth combined with the common occurrence of soft tissue imbalance makes orthodontic treatment in hyperdivergent group of patients more difficult in comparison to patients with normal or hypodivergent growth pattern.

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Comparison of soft tissue chin thickness in adult patients with various mandibular divergence patterns in Kodava population

Cited by 6 publications

References 0 publications

Determination of individual teleroentgenographic characteristics of the face profile in ukrainian young men and girls with orthognathic bite

Determination of individual teleroentgenographic characteristics of the face profile in ukrainian young men and girls with orthognathic bite

Soft-Tissue Analysis of Different Sagittal Skeletal Patterns Using the Geometric Morphometric Method

Balance and thickness of soft tissue of the lower third of the face in different vertical patterns of growth

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