scholarly journals Regression models of teleradiographic indicators of the position of teeth and the profile of face soft tissues in ukrainian young men and young women with different face profiles according to Schwarz A. M.

2021 ◽  
Vol 25 (2) ◽  
pp. 208-214
Author(s):  
O. S. Prokopenko
Keyword(s):  
Soft Tissue ◽  
Young Women ◽  
Regression Models ◽  
Soft Tissues ◽  
Young Men ◽  
Front Face ◽  
Facial Soft Tissue ◽  
Tooth Position ◽  
Soft Tissue Profile ◽  
Dental Apparatus

Annotation. The needs of modern dentistry require constant improvement of research methods of human dental apparatus, parameters of craniofacial structures, determination of congenital and acquired deformities of the dental apparatus and improving the consequences of treatment. Diagnosis of orthodontic pathology is based on the identification of a large number of different indicators, which requires the use of mathematical analysis not only to processing of received parameters, but also to mathematical modelling individual cephalometric, gnatometric indicators, facial soft tissue parameters that affect its profile and aesthetics. The aim of the work is to develop and analyze regression models of teleradiographic indicators of tooth position and facial soft tissue profile indices according to A. M. Schwarz in Ukrainian boys and girls with orthognathic occlusion and with different facial profiles. Lateral teleroentgenograms (TRG) of 49 young men aged 17 to 21 years and 76 young women aged 16 to 20 years with a physiological bite as close as possible to orthognathic were analyzed. In the licensed package “Statistica 6.0” regression models of teeth position and soft tissue profile according to the A. M. Schwarz method are built depending on the basic cephalometric (1st group) and gnatometric (2nd group) indicators separately for young men and young women with different facial profiles according to A. M. Schwarz In young men, 21 of the 24 possible reliable regression models with coefficients of determination greater than 0.6 (R2 = from 0.736 to 0.999) were constructed. For young men with 2 face profile (straight face profile), the following models of all 8 indicators were built, and the coefficients of determination in the models of this group of persons (R2 = from 0.966 to 0.999) were the highest compared to the models of other groups of young men or young women. For young men with 3 face profile (front face profile), models were built for 7 indicators (except for the SnPog'-Pn angle indicator) with R2 from 0.736 to 0.983. For young men with 1 face profile (back face profile), such models were created for 6 indicators (R2 from 0.815 to 0.993) – in addition to the angle II and the angle SnPog'-Pn. A total of 18 models out of 24 possible were built for young women (R2 = from 0.736 to 0.999). In young women with 2 face profile, as well as in young men with this profile, models were constructed for all 8 studied TRG-indicators of tooth position and facial soft tissue indicators according to A.M. Schwarz (R2 = from 0.736 to 0.982), and for young women with 3 face profile – for 7 indicators (except for angle II) with R2 from 0.604 to 0.740. For young women with 1 face profile, the smallest number of models of the studied indicators was constructed in comparison with all groups of young men or young women with different face profiles – only 3 models out of 8 possible: for Sn-Pn distance (R2 = 0.828), Pog'-Por distance (R2 = 0.844) and the angle SnPog'-Pn (R2 = 0.982). Both young men and young women in the created models more often include indicators of 2nd group.

scholarly journals Regression models of teleroentgenograhic indicators of the position of teeth and the profile of face soft tissues in juvenile aged persons with different face types according to Schwarz A.M.

2021 ◽  
Vol 27 (2) ◽  
pp. 39-46
Author(s):  
O.S. Prokopenko
Keyword(s):  
Young Women ◽  
Regression Models ◽  
Soft Tissues ◽  
Young Men ◽  
Human Anatomy ◽  
Front Face ◽  
Normative Values ◽  
Face Type ◽  
Soft Tissue Profile ◽  
The Face

Considering the differences in the values of teleroentgenograhic (TRG) indicators in different racial, gender, ethnic, age, population, geographical population groups and numerical methods of TRG analysis, determination of normative values of cephalometric, gnatometric TRG-indicators, their interdependencies in the population of different countries is extremely important both for human anatomy and for the practice of dentists. This fully applies to residents of Ukraine of different age groups. The aim of the work is to develop and analyze regression models of teleroentgenograhic indicators of tooth position and facial soft tissue profile according to Schwarz A.M. in Ukrainian young men and young women with different facial types. Lateral teleroentgenograms of 49 young men (aged 17 to 21 years) and 76 young women (aged 16 to 20 years) with physiological occlusion as close as possible to orthognathic were analyzed. In the license package “Statistica 6.0” regression models of indicators of position of teeth and profile of soft tissues of the face according to the method of Schwarz A.M. depending on basic cephalometric and gnatometric indicators separately for boys and for girls with different types of the face are constructed. In young men, 16 of the 24 possible reliable regression models were constructed, in which the coefficient of determination is greater than 0.6 (R2=from 0.609 to 0.998). For young men with 1st (back face type) and 3rd (front face type) face types, the following models were created with respect to 5 indicators from 8 possible (respectively, angles Max1-SpP S-arz, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’ and SnPog’-Pn; R2 = from 0.609 to 0.998 and angles Max1-SpP S-arz and Mand1-MP Schwars, distances Sn-Pn and Pog’-Por, angle Gl’LsPog’; R2 = from 0.609 to 0.946), and for young men with 2nd face types (average face type according to Schwarz AM) – for 6 indicators (angles Max1-SpP S-arz and Mand1-MP Schwars, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’and SnPog’-Pn; R2 = from 0.690 to 0.990). In young women, 17 of the 24 possible reliable models with R2 greater than 0.6 (R2 = 0.628 to 0.958) were constructed. For young women with 1st type of face 6 indicators are modeled – angles Max1-SpP S-arz, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’and SnPog’-Pn, the distance of Li-SnPog’(R2= from 0.663 to 0.958). For young women with 2nd face type, the following models were created for 7 indicators – angles Max1-SpP S-arz and Mand1-MP Schwars, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’ and SnPog’-Pn, distances Li-SnPog’(R2= from 0.628 to 0.891). For young women with 3rd face type the smallest number of models with R2 larger than 0.6 was built, compared to all groups of persons with different face types – only 4 models for Max1-SpP S-arz angle, Pog’-Por distance, angles Gl’LsPog’ and SnPog’-Pn (R2 from 0.718 to 0.847).

scholarly journals Regression models of individual teleradiographic indicators according to Ricketts method in Ukrainian young men and young women with different face types

2021 ◽  
Vol 25 (2) ◽  
pp. 238-246
Author(s):  
I. Yu. Drachevska
Keyword(s):  
Young Women ◽  
Regression Models ◽  
Soft Tissues ◽  
Young Men ◽  
Coefficient Of Determination ◽  
Successful Implementation ◽  
Cephalometric Analysis ◽  
The Third ◽  
Results Of Treatment ◽  
Surgical Methods

Annotation. Anomalies of the dental-jaw system are one of the most difficult challenges of modern orthodontics, and accordingly require the use of modern and evidence-based therapy. To predict the results of treatment and proper planning of orthodontic interventions, a reliable tool in the hands of an orthodontist is cephalometric analysis by the Ricketts method. An important step in the successful implementation of this method of analysis is to conduct a study taking into account ethnicity, age, sex and the influence of facial type on teleradiographic indicators calculated by this method. The aim of the study is to build and analyze regression models of teleradiographic indicators used in the Ricketts method for Ukrainian young men and young women with orthognathic occlusion with different face types. Ricketts teleradiography was performed for 49 young men and 76 young women with orthognathic occlusion. Cephalometric analysis was performed using OnyxCeph³™ software, 3DPro version, Image Instruments GmbH, Germany (software license URSQ-1799). The division into facial types was performed by determining the morphological index of Garson. All indicators were divided into three groups: the first group included the main cephalometric points and measurements used in modern cephalometric analyzes Schwartz, Ricketts, Steiner, Roth-Jarabak, Burstone and Bjork and are parameters that usually do not change during surgery and orthodontic treatment; to the second group – metric dental-jaw characteristics by the Ricketts method by which surgical methods can change the length, width, angles and position of the jaws; to the third group – indicators according to the Ricketts method which characterize the position of each individual tooth relative to each other, cranial structures and the profile of the soft tissues of the face. Regression models of individual teleradiographic indicators are built using the license package "Statistica 6.0". Only reliable models with a coefficient of determination higher than 0.6 were subject to analysis. Of the 13 possible facial features, 9 models of teleradiographic indicators (R² = from 0.691 to 0.834) were included to the second group, depending on the indicators of the first group, and 9 (R² = from 0.640 to 0.910) of the 15 possible models of indicators were included to the third group depending on the indicators of the first and second groups. In young men with a wide type of face, the constructed models of indicators included to the second group, depending on the indicators of the first group, most often include the distance Ar-Go (20.7 %), angle POr-NBa (13.8 %), distances N-S and S-E and the ratio N-S:S-Ar' (10.3 % each); and to the models of indicators included in the third group depending on the indicators of the first and second groups – the angle N-CF-A (12.8 %), the distance Ar-Go (10.3 %), the distances N-CC and A-NPog and angle ANS- Xi-Pm, POr-ANSPNS and DC-Xi-Pm (7.7 % each). In young women with a very wide type of face out of 13 possible built only 2 models of teleradiographic indicators (R² = 0.691 and 0.834) which were included to the second group depending on the indicators of the first group and 5 (R² = from 0.628 to 0.919) of 15 possible models of indicators which entered the third group depending on the indicators of the first and second groups. In young women with a very wide type of face, the constructed models of indicators included in the third group, depending on the indicators of the first and second groups, most often include the distance Xi-Pm (18.2 %), as well as the distance P-PTV and angles MeGo-NPog and POr-CFXi (9.1 % each). In young women with a wide type of face from 13 possible 5 models of teleradiographic indicators (R² = from 0.606 to 0.854) which were included in the second group depending on indicators of the first group and 7 (R² = from 0.607 to 0.888) from 15 possible models of indicators which were entered to the third group depending on the indicators of the first and second groups. In young women with a wide type of face, the constructed models of indicators included in the second group, depending on the indicators of the first group, most often include the distance Ar-Go (28.6 %) and the angle POr-NBa and the ratio S-ar:ar-Go (14.3 %), and to the models of indicators included in the third group depending on the indicators of the first and second groups – the distances A-NPog and Xi-Pm and the angle NBa-PtG (10.3 % each).

scholarly journals Regression models of teleradiographic parameters according to the Jarabak method in young men and young women with orthognathic occlusion

2021 ◽  
Vol 27 (3) ◽  
pp. 35-41
Author(s):  
V.V. Vakhovskyi ◽  
М.М. Shinkaruk-Dykovytska ◽  
V.H. Chaika ◽  
O.O. Likhitskyi ◽  
V.V. Yasko
Keyword(s):  
Young Women ◽  
Regression Models ◽  
Soft Tissues ◽  
Young Men ◽  
Coefficient Of Determination ◽  
Regression Equations ◽  
The Third ◽  
Surgical Methods ◽  
The Face ◽  
Length Width

Obtaining orthognathic occlusion in a patient as a result of treatment is a key goal of any orthodontist. However, the thorny path that both the patient and the doctor must go through involves painstaking work, which primarily begins with planning and choosing a method of orthodontic treatment, predicting and modeling its results. However, the latter is possible only if previously conducted research to determine the normative indicators for a population. The aim of the study was to construct and analyze regression models of teleradiographic parameters according to the Jarabak method in Ukrainian young men and young women with orthognathic occlusion. 49 young men and 76 young women with orthognathic occlusion underwent cephalometric analysis of lateral radiographs according to the modification of the method Jarabak J. R. – Roth-Jarabak, performed using the software OnyxCeph³™. All parameters according to the Jarabak method were divided into three groups: the first group included metric characteristics of the skull, which are used as baseline indicators; to the second group – dental-jaw in which the skeleton has already been formed and which surgical methods can change the length, width, angles and positions of the upper and lower jaws; to the third group – indicators that characterize the position of each individual tooth relative to each other, cranial structures and the profile of the soft tissues of the face. Construction of regression models of teleradiographic indicators by the Jarabak method was performed in the licensed package “Statistica 6.0” using step-by-step regression analysis. When modeling teleradiographic parameters according to the Jarabak method, which were included in the second group, depending on the indicators of the first group in young men with orthognathic occlusion, 8 out of 19 possible reliable regression models with a coefficient of determination greater than 0.5 (R2= from 0.589 to 0.950) were constructed. The constructed equations most often include the value of the angle N-S-Ar and the distances Ar-Go and N-S. In young women with orthognathic occlusion, 6 reliable regression models of the second group were constructed depending on the indicators of the first group (R2= from 0.609 to 0.971). The constructed equations most often include the value of the distances Ar-Go, S-Ar, N-S and the angle N-S-Ar. When modeling teleradiographic indicators included in the third group, depending on the indicators of the first and second groups in young men, 5 out of 8 possible reliable regression models with a coefficient of determination greater than 0.5 (R2= from 0.658 to 0.751) were constructed. The constructed equations most often include the values of the angles N-A-Pog, N-Go-Gn, S-N-B and A-N-B. In young women with orthognathic occlusion, 6 reliable regression models of the third group were constructed depending on the indicators of the first and second groups (R2= from 0.509 to 0.772). The constructed regression equations most often include the value of the angles N-A-Pog, A-N-B, S-Ar-Go, S-N-A and the ratio Go_Me:N-S. The obtained models will allow orthodontists to automatically calculate the required cephalometric parameters.

scholarly journals Regression models of teleradiographic parameters according to the Bjork method in young men and young women with orthognathic occlusion

2021 ◽  
Vol 25 (3) ◽  
pp. 376-380
Author(s):  
V. V. Vakhovskyi
Keyword(s):  
Young Women ◽  
Regression Models ◽  
Soft Tissues ◽  
Treatment Plan ◽  
Young Men ◽  
Coefficient Of Determination ◽  
Regression Equations ◽  
The Third ◽  
Promising Area ◽  
The Face

Annotation. The ability to predict the values of certain teleradiographic indicators and their correlations for young people in need of dental care is a promising area of research. The data obtained will be able to more accurately help doctors build a treatment plan. The aim of the study was to build and analyze regression models of teleradiographic parameters according to the Bjork method in young men and young women with orthognathic occlusion. Cephalometric analysis of lateral teleradiograms (49 young men and 76 young women with orthognathic occlusion) according to the modification of the Bjork A. – CFT-Bjork method, performed using OnyxCeph³™ software, 3DPro version, from Image Instruments GmbH, Germany. Cephalometric parameters were divided into three groups: the first – metric characteristics of the skull, which are used as baseline indicators; the second – indicators of the upper and lower jaws; third – indicators that characterize the position of the teeth relative to each other, cranial structures and the profile of the soft tissues of the face. Regression models of teleradiographic indicators by the Bjork method are built in the license package “Statistica 6.0”. When modeling teleradiography indicators according to the Bjork method, which were included in the second group, depending on the indicators of the first group in young men with orthognathic occlusion, 9 out of 13 possible reliable regression models with a coefficient of determination greater than 0.5 (R2 = from 0.528 to 0.775) were constructed. The constructed regression equations most often include the value of the angles S-N-Pog, NSL/NL, NSL/ML, NL/ML, A-N-Pog, S-N-B and the distance Ii-Is. In young women with orthognathic occlusion, 7 reliable models of indicators of the third group were constructed depending on the indicators of the first and second groups (R2 = from 0.508 to 0.844). The constructed regression equations most often include the value of the angles NSL/ML, NL/ML, A-N-Pog, ML/RL and A-N-B. In young men and young women, the models of indicators belonging to the second group, depending on the indicators of the first group, had coefficients of determination less than 0.5, or were not built at all.

scholarly journals Facial Soft Tissue Profile Following Bimaxillary Orthognathic Surgery

2008 ◽  
Vol 78 (1) ◽  
pp. 50-57 ◽  
Author(s):  
Ayse Tuba Altug-Atac ◽  
Halise Bolatoglu ◽  
Ufuk Toygar Memikoglu
Keyword(s):  
Soft Tissue ◽  
Orthognathic Surgery ◽  
Soft Tissues ◽  
Skeletal Structure ◽  
Dramatic Improvement ◽  
Facial Soft Tissue ◽  
Forward Movement ◽  
Lower Lip ◽  
Soft Tissue Profile ◽  
Bimaxillary Orthognathic Surgery

Abstract Objective: To determine the changes in the position and area of nasal and labial soft tissues in adult skeletal Class III patients who underwent bimaxillary orthognathic surgery. Materials and Methods: Pretreatment (T1), preoperative (T2), and posttreatment (T3) cephalometric variables and upper-lower lip areas were measured on lateral cephalometric radiographs for 20 individuals (9 male, 11 female; mean age 21.3 years at T1, 22.4 years at T2, and 23.4 years at T3) who had maxillary advancement and mandibular setback. Analysis of variance (ANOVA) and Duncan tests were used to compare the cephalometric and area measurements at the beginning of treatment, and at presurgery and postsurgery, respectively. Paired t-tests were also performed to analyze changes within the periods. Results: The tip of the nose was affected less with the movement of the underlying skeletal structure (0.25%), while the soft tissue B point (B′) moved equally with the skeletal B point. As the maxilla related variables increased due to the forward movement, the upper labial areas decreased. With the backward movement of the mandible, the middle and inferior lower labial areas increased, while the superior lower labial area decreased. Conclusions: The results of our study suggest that the dramatic improvement in the facial profiles of the bimaxillary surgery patients is primarily related to the backward movement of the mandible and the significant reduction in the superior lower lip area.

scholarly journals Modeling of individual teleradiographic indicators according to the Steiner method for Ukrainian young men with wide and young women with a very wide and wide face types

2021 ◽  
Vol 27 (3) ◽  
pp. 15-21
Author(s):  
I.Yu. Drachevska
Keyword(s):  
Young Women ◽  
Regression Models ◽  
Soft Tissues ◽  
Local Population ◽  
Young Men ◽  
Coefficient Of Determination ◽  
Wide Face ◽  
Face Modeling ◽  
Face Type ◽  
Surgical Methods

Cephalometric methods of analysis of lateral teleradiograms are one of the key elements of orthodontic planning of treatment of a patient with pathology of the dental-jaw system. Determining normative teleradiographic indicators for the local population is a key step for the successful application of one or another method of analysis, in particular, for Ukraine. The aim of the study was to construct and analyze regression models of teleradiographic parameters used in the Steiner method for Ukrainian young men and young women with orthognathic occlusion with different face types. 49 young men and 76 young women with orthognathic occlusion in the software OnyxCeph³™, version 3DPro, the company Image Instruments GmbH, Germany (license № URSQ-1799) conducted a cephalometric study using the Steiner method. The division into facial types was performed using the Garson index. Cephalometric parameters were divided into three groups: the first – indicators used in cephalometric analyzes of Schwarz, Ricketts, Steiner, Roth-Jarabak, Burstone and Bjork and are included in the parameters that usually do not change during surgical and orthodontic treatment; the second – dental-maxillary characteristics according to the Steiner method which surgical methods can be used to change the length, width, angles and position of the jaws; third – indicators according to the Steiner method that characterize the position of each tooth relative to each other, cranial structures and the profile of the soft tissues of the face. Modeling of individual teleradiographic indicators was performed in the licensed package “Statistica 6.0” using step-by-step regression analysis. When analyzing reliable models of teleradiographic indicators according to the Steiner method, which were included in the second group depending on the indicators of the first group with a coefficient of determination higher than 0.6, it was found that out of 7 possible, 5 models were built for young men with a wide face type, which most often include the value of the distances Ar-Go and N-S and the angles H and N-S-Ar; young women with a very wide type of face – 3 models (R²=from 0.604 to 0.812) which most often include the value of the angles N-S-Ar and H; in young women with a wide type of face – 4 models (R²= from 0.694 to 0.771) which most often include the value of the angles POr-NBa and H, the distance P-PTV and the ratio S-ar:ar-Go. When analyzing reliable models of teleradiographic indicators according to the Steiner method, which were included in the third group depending on the indicators of the first and second groups with a coefficient of determination higher than 0.6, it was found that out of 8 possible in young people with a wide face type, 7 models were built (R²= from 0.662 to 0.946). which most often include the magnitude of the angles ANB and SN-GoGn and the distance P-PTV; in young women with a very wide face type – 4 models (R²= from 0.635 to 0.844) which most often include the value of the angles ANB, SNA, POr-NBa and the distance Pog-NB; in young women with a wide type of face – 6 models (R²= from 0.617 to 0.923), which most often include the value of the distances Pog-NB and N-CC and the angle ANB. Construction of regression models of teleradiographic indicators used in the Steiner method in Ukrainian young men and young women with orthognathic occlusion is the foundation for creating a database of normative cephalometric indicators in Ukraine, which will provide dental care to the population at the current level.

scholarly journals Three-dimensional soft tissue evaluation after rapid maxillary expansion and mandibular midline distraction osteogenesis

2021 ◽  
Author(s):  
Seyit Ahmet Öztürk ◽  
Sıddık Malkoç ◽  
Ümit Yolcu ◽  
Zehra İleri ◽  
Özge Çelik Güler
Keyword(s):  
Soft Tissue ◽  
Distraction Osteogenesis ◽  
Soft Tissues ◽  
Three Dimensional ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Facial Soft Tissue ◽  
Lower Lip ◽  
Soft Tissue Profile ◽  
Dependent Samples

ABSTRACT Objectives To evaluate the effects of rapid maxillary expansion (RME) and mandibular midline distraction osteogenesis (MMDO) on facial soft tissues using three-dimensional (3D) images. Materials and Methods A total of 20 patients (average age 15.86 ± 2.17 years) were treated with RME and MMDO using tooth-borne distractors. Three-dimensional photographs of each patient were taken with a stereophotogrammetry system at baseline (T0), at the end of the distraction period (T1), and at the end of the consolidation period (T2). All data were analyzed using a dependent-samples t-test at a significance level of 5%. Results Total and lower face height increased after MMDO (P < .05). Nasal and mouth width increased after RME as compared with baseline (P < .05). The labiomental angle increased at T1 and decreased at T2 (P < .05). After MMDO, the convexity angle increased while the mandibular angle decreased (P < .05). Upper and lower lip angles increased after RME (P < .05). The distance from the lower lip to the E plane increased after MMDO and decreased after RME (P < .05). Conclusions The MMDO and RME procedures provide an efficient nonextraction treatment alternative for transverse maxillomandibular deficiency. MMDO may improve the facial soft tissue profile in the transverse and vertical axis of the mandibular region.

A Quantitative Three-Dimensional Assessment of Abnormal Variations in Facial Soft Tissues of Adult Patients with Cleft Lip and Palate

2003 ◽  
Vol 40 (5) ◽  
pp. 544-549 ◽  
Author(s):  
Virgilio F. Ferrario ◽  
Chiarella Sforza ◽  
Claudia Dellavia ◽  
Gianluca M. Tartaglia ◽  
Davide Sozzi ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Cleft Lip ◽  
Soft Tissues ◽  
Cleft Lip And Palate ◽  
Three Dimensional ◽  
Z Score ◽  
Soft Tissue Profile ◽  
Variability Index ◽  
The Mean ◽  
Facial Soft Tissues

Objective To supply quantitative information about the facial soft tissues of adult operated patients with cleft lip and palate (CLP). Design, Setting, and Patients The three-dimensional coordinates of soft tissue facial landmarks were obtained using an electromagnetic digitizer in 18 Caucasian patients with CLP (11 males and 7 females aged 19 to 27 years) and 162 healthy controls (73 females and 89 males aged 18 to 30 years). From the landmarks, 15 facial dimensions and two angles were calculated. Data were compared with those collected in healthy individuals by computing z-scores. Two summary anthropometric measurements for quantifying craniofacial variations were assessed in both the patients and reference subjects: the mean z-score (an index of overall facial size), and its SD, called the craniofacial variability index (an index of facial harmony). Results In treated patients with CLP, facial size was somewhat smaller than in normal individuals, but in all occasions the mean z-score fell inside the normal interval (mean ± 2 SD). Almost all patients had a craniofacial variability index larger than the normal interval, indicating a global disharmonious appearance. Overall, in patients pronasale, subnasale, and pogonion were more posterior, the nose was shorter and larger, the face was narrower, and the soft tissue profile and upper lip were flatter than in the reference population. Conclusions The facial soft tissue structures of adult operated patients with CLP differed from those of normal controls of the same age, sex, and ethnic group. In this patient group, surgical corrections of CLP failed to provide a completely harmonious appearance, even if the deviations from the reference were limited. Further analyses of larger groups of patients are needed.

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

2018 ◽  
pp. 28-34
Author(s):  
М. О. Dmitriev
Keyword(s):  
Regression Analysis ◽  
Soft Tissue ◽  
Young Women ◽  
Stepwise Regression ◽  
Young Men ◽  
Stepwise Regression Analysis ◽  
Regression Equations ◽  
Determination Coefficient ◽  
Normal Occlusion

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.

MATHEMATICAL MODELING OF TELEROENTGENOGRAPHIC PARAMETERS ACCORDING TO THE METHOD OF SCHWARZ A. M. DEPENDING ON THE BASIC CEPHALOMETRIC PARAMETERS IN UKRAINIAN YOUNG MEN AND YOUNG WOMEN WITH DIFFERENT FACE TYPES

2021 ◽  
Vol 74 (6) ◽  
pp. 1488-1492
Author(s):  
Аlla V. Маrchenko ◽  
Oleksandr S. Prokopenko ◽  
Іryna V. Dzevulska ◽  
Tatyana R. Zakalata ◽  
Igor V. Gunas
Keyword(s):  
Young Women ◽  
Regression Models ◽  
Young Men ◽  
Cone Beam ◽  
Coefficient Of Determination ◽  
Normal Occlusion ◽  
Different Types ◽  
Dental Intervention ◽  
Individualized Approach ◽  
Facial Types

The aim: Is development and analysis of regression models of teleroentgenographic indices according to Schwarz A. M., which can be adjusted during surgery depending on the parameters that usually do not change in Ukrainian young men and young women with with normal occlusion close to orthognathic occlusion and different facial types. Materials and methods: Teleroentgenographic indices were obtained using a dental cone-beam tomograph Veraviewepocs 3D Morita and studied in 49 young men and 76 young women with normal occlusion close to orthognathic. Persons were divided into groups with different face types according to the recommendations of Schwarz A. M. In the license package “Statistica 6.0”, regression models of teleroentgenographic indices were built according to Schwarz A. M. Results: For young men with orthognathic occlusion and with different types of faces according to Schwarz A. M. constructed 10 of 27 possible reliable regression models of the group of teleroentgenographic indicators, which can be corrected during surgical, orthopedic interventions in dentistry depending on the group of basic, invariable cephalometric indicators greater than 0.6 (R2 = from 0.609 to 0.996); and in young women with different face types, 8 of the 27 possible reliable regression models in which the coefficient of determination is greater than 0.6 (R2 = from 0.642 to 0.986). Conclusions: The developed regression models provide the most individualized approach in determining the method and scope of the required dental intervention.

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