Distribution of Pediatric Malocclusion Patients in Seoul National University Dental Hospital

A total of 580 patients, who visited and received an orthodontic diagnosis in the Department of Pediatric Dentistry, Seoul National University Dental Hospital from 2017 to 2019, were investigated in this study. The aim of this study was to evaluate skeletal patterns of pediatric orthodontic patients determined with lateral cephalometric analysis and to analyze the relationship between skeletal pattern and probable associated clinical features. Also, the modality of orthodontic treatment for each skeletal classification was investigated to aid in therapeutic decisions.<br/>Patients aged 7 year accounted for the largest age group; 54.2% of patients showed a skeletal class I pattern, 22.2% showed a skeletal class II pattern, and 23.6% showed a skeletal class III pattern. Bi-maxillary retrusion for skeletal class I, retruded mandible with normal positioning of the maxilla for skeletal class II, and retrusion of the maxilla with protrusion of the mandible for skeletal class III were the largest subgroups by skeletal pattern. Brachyfacial type accounted for 55.0% of patients, followed by 31.9% of mesofacial type and 13.1% of dolichofacial type. The prevalence of anterior crossbite in the study was 43.3%, higher than that in previous studies.

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Anatomical characteristics of mandibular bone in skeletal Class I, II and III patients by using cone beam computed tomography images in an iranian population

Brazilian Dental Science ◽

10.14295/bds.2021.v24i2.2475 ◽

2021 ◽

Vol 24 (2) ◽

Author(s):

Mohammad Zandi ◽

Abbas Shokri ◽

Vahid Mollabashi ◽

Zahed Eghdami ◽

Payam Amini

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Class Ii ◽

Class I ◽

Cone Beam ◽

Class Iii ◽

Anatomical Characteristics ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Ramus Height

Objetive: This study aimed to compare the anatomical characteristics of the mandible in patients with skeletal class I, II and class III disorders using cone beam computed tomography (CBCT). Material and Methods: CBCT scans of patients between 17 to 40 years taken with NewTom 3G CBCT system with 12-inch field of view (FOV) were selected from the archive. Lateral cephalograms were obtained from CBCT scans of patients, and type of skeletal malocclusion was determined (Class I, II or III). All CBCT scans were evaluated in the sagittal, coronal and axial planes using the N.N.T viewer software. Results: The ramus height and distance from the mandibular foramen to the sigmoid notch in class II patients were significantly different from those in skeletal class I (P < 0.005). Distance from the mandibular canal to the anterior border of ramus in class III individuals was significantly different from that in skeletal class I individuals (P < .005). Conclusion: Length of the body of mandible in skeletal class I was significantly different from that in skeletal class II and III patients. Also, ramus height in skeletal class I was significantly different from that in skeletal class II patients. CBCT had high efficacy for accurate identification of anatomical landmarks. Keywords Prognathism; Retrognathism; Mandible; Anatomy; Cone beam computed tomography.

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Relationship between skeletal Class II and Class III malocclusions with vertical skeletal pattern

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.24.4.063-072.oar ◽

2019 ◽

Vol 24 (4) ◽

pp. 63-72

Author(s):

Sonia Patricia Plaza ◽

Andreina Reimpell ◽

Jaime Silva ◽

Diana Montoya

Keyword(s):

Class Ii ◽

Class Ii Malocclusion ◽

Class Iii ◽

Class Iii Malocclusion ◽

Multinomial Regression ◽

Lateral Cephalogram ◽

Cross Sectional ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Skeletal Pattern

ABSTRACT Objective: The purpose of this study was to establish the association between sagittal and vertical skeletal patterns and assess which cephalometric variables contribute to the possibility of developing skeletal Class II or Class III malocclusion. Methods: Cross-sectional study. The sample included pre-treatment lateral cephalogram radiographs from 548 subjects (325 female, 223 male) aged 18 to 66 years. Sagittal skeletal pattern was established by three different classification parameters (ANB angle, Wits and App-Bpp) and vertical skeletal pattern by SN-Mandibular plane angle. Cephalometric variables were measured using Dolphin software (Imaging and Management Solutions, Chatsworth, Calif, USA) by a previously calibrated operator. The statistical analysis was carried out with Chi-square test, ANOVA/Kruskal-Wallis test, and an ordinal multinomial regression model. Results: Evidence of association (p< 0.05) between sagittal and vertical skeletal patterns was found with a greater proportion of hyperdivergent skeletal pattern in Class II malocclusion using three parameters to assess the vertical pattern, and there was more prevalent hypodivergence in Class III malocclusion, considering ANB and App-Bpp measurements. Subjects with hyperdivergent skeletal pattern (odds ratio [OR]=1.85-3.65), maxillary prognathism (OR=2.67-24.88) and mandibular retrognathism (OR=2.57-22.65) had a significantly (p< 0.05) greater chance of developing skeletal Class II malocclusion. Meanwhile, subjects with maxillary retrognathism (OR=2.76-100.59) and mandibular prognathism (OR=5.92-21.50) had a significantly (p< 0.05) greater chance of developing skeletal Class III malocclusion. Conclusions: A relationship was found between Class II and Class III malocclusion with the vertical skeletal pattern. There is a tendency toward skeletal compensation with both vertical and sagittal malocclusions.

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Rotation of the upper first molar in Class I, II, and III patients

European Journal of Dentistry ◽

10.4103/1305-7456.175696 ◽

2016 ◽

Vol 10 (01) ◽

pp. 059-063

Author(s):

Cristiane de Oliveira Viganó ◽

Viviane Ekerman da Rocha ◽

Laerte Ribeiro Menezes Junior ◽

Luiz Renato Paranhos ◽

Adilson Luiz Ramos

Keyword(s):

Rotation Angle ◽

Class Ii ◽

Variance Analysis ◽

Class I ◽

Class Iii ◽

Skeletal Class ◽

Skeletal Class Ii ◽

The Mean ◽

Upper Molar ◽

Line Crossing

ABSTRACT Objective: The aim of this study was to evaluate the mean rotation of the upper first molar (U1st M) in cast models from nontreated patients presenting: Class I, skeletal Class II, dental Class II, and skeletal Class III, comparing with Class I orthodontically treated patients. Materials and Methods: One hundred cast models were evaluated with five groups, composed of nontreated Class I (n = 20), dental Class II (n = 20), skeletal Class II (n = 20), skeletal Class III (n = 20), and treated Class I (n = 20). Measurements were taken from photocopies of the upper arches. The angle formed between a line crossing the mesiopalatal and the distal-buccalcusps of the U1st M and a line traced on mid palatal junction were measured in all samples. Results: One-way variance analysis showed that dental Class II group presented great mean rotation of the 1st molar (x = 78.95°, SD = 6.19) (P < 0.05), and in 85% of the patients from this group this angle was higher than 73°. Conclusions: The skeletal Class II and skeletal Class III groups showed similar mean position of the 1st molar, presenting rotation in approximately 50% of the patients. It can be concluded that upper molar rotation occurs mainly in dental Class II patients and shows higher mesial rotation angle.

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Pattern of Malocclusion in Orthodontic Patients in South-Eastern Region of Nepal

Orthodontic Journal of Nepal ◽

10.3126/ojn.v7i1.18893 ◽

2017 ◽

Vol 7 (1) ◽

pp. 7-10 ◽

Cited By ~ 1

Author(s):

Anand Acharya ◽

Bhushan Bhattarai ◽

Diana George ◽

Tarakant Bhagat

Keyword(s):

Class Ii ◽

Class I ◽

Eastern Region ◽

Class Iii ◽

Skeletal Class ◽

South Eastern ◽

Skeletal Malocclusion ◽

Skeletal Class Ii ◽

Lateral Cephalograms ◽

Orthodontic Patients

Introduction: Occlusal traits in orthodontic patients have been studied in different parts of Nepal. However, very few data are available on malocclusion in south-eastern region of Nepal.Objective: To assess the pattern of malocclusion occurring in orthodontic patients in south-eastern region of Nepal, and to estimate the age of presentation of Class II malocclusion among the patients.Materials & Method: Data were collected from 150 pre-treatment study models and lateral cephalograms from two orthodontic specialty clinics in Biratnagar. Angle’s classification system was used to determine dental malocclusion and ANB angle was used to determine skeletal malocclusion. Chi square test was used to test the association between dental and skeleton malocclusions.Result: Angle’s Class I malocclusion was found in 95(63.33%), Class II Div 1 in 41(27.33%), Class II Div 2 in 13(8.66%) and Class III in 1(0.66%). Among all subjects; 119 (79.33%) had skeletal Class I, 24(16%) had skeletal Class II and 7(4.66%) had skeletal Class III. There was significant association between dental and skeletal malocclusions. The average age for reporting Class II Div 1 malocclusion was 16.5 years and Class II Div 2 malocclusion was 19 years.Conclusion: Angle’s Class I is the most common malocclusion followed by Class II and Class III among orthodontic patients in south-eastern Nepal. The subjects lack awareness on age factor for orthodontic treatment.

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Genetic Polymorphisms in FGFR2 Underlie Skeletal Malocclusion

Journal of Dental Research ◽

10.1177/0022034519872951 ◽

2019 ◽

Vol 98 (12) ◽

pp. 1340-1347 ◽

Cited By ~ 4

Author(s):

Q. Jiang ◽

L. Mei ◽

Y. Zou ◽

Q. Ding ◽

R.D. Cannon ◽

...

Keyword(s):

Osteogenic Differentiation ◽

Bone Growth ◽

Class Ii ◽

Class I ◽

Class Iii ◽

Mobility Shift ◽

Skeletal Class ◽

Skeletal Malocclusion ◽

Skeletal Class Ii ◽

The Common

Fibroblast growth factor receptor 2 ( FGFR2) in craniofacial bones mediates osteoprogenitor proliferation, differentiation, and apoptosis. The distortion of proper craniofacial bone growth may cause class II and class III skeletal malocclusion and result in compromised function and aesthetics. Here, we investigated the association between variations in FGFR2 and skeletal malocclusions. First, 895 subjects were included in a 2-stage case-control study with independent populations (stage 1: n = 138 class I, 111 class II, and 81 class III; stage 2: n = 279 class I, 187 class II, and 99 class III). Eight candidate single-nucleotide polymorphisms (SNPs) in FGFR2 were screened and validated. Five SNPs (rs2162540, rs2981578, rs1078806, rs11200014, and rs10736303) were found to be associated with skeletal malocclusions (all P < 0.05). That is, rs2162540 was significantly associated with skeletal class II malocclusion, while others were associated with skeletal class III malocclusion. Electrophoretic mobility shift assay and chromatin immunoprecipitation analysis showed that the common genotypes of rs2981578 and rs10736303 contained the binding sites of RUNX2 and SMAD4. Compared with the common genotypes, the minor genotypes at these 2 SNPs decreased the binding affinity and enhancer effect of RUNX2 and SMAD4, as well the levels of FGFR2 expression. In addition, FGFR2 expression contributed positively to osteogenic differentiation in vitro. Thus, we identified FGFR2 as a skeletal malocclusion risk gene, and FGFR2 polymorphisms regulated its transcriptional expression and then osteogenic differentiation.

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The Airway Volume Related to the Maxillo-Mandibular Position Using 3D Analysis

BioMed Research International ◽

10.1155/2021/6670191 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Víctor Ravelo ◽

Gabriela Olate ◽

Gonzalo Muñoz ◽

Márcio de Moraes ◽

Sergio Olate

Keyword(s):

Class Ii ◽

3D Analysis ◽

Class Iii ◽

Cross Sectional ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Mandibular Plane ◽

Mandibular Position ◽

Skeletal Pattern ◽

Maxilla And Mandible

Objective. The aim of this research was to compare three cephalometric analyses and their correlation with the airway volume in subjects with different skeletal classes using 2D and 3D images. Study Design. Cross-sectional descriptive study. Material and Method. Steiner, McNamara, and Ricketts analyses and the airway volume were compared in 115 subjects who were candidates for orthognathic surgery under diagnosis using cone beam computed tomography (CBCT); 46 males (40%) and 69 females (60%) were included. The sagittal positions of the maxilla and mandible, the angulation of the mandibular plane, the sagittal positions of the upper and lower incisors, measurements of the largest or shortest airway area, and the volume were compared using Spearman’s test considering a p value < 0.05. Results. Differences were observed between the Steiner and McNamara techniques for the sagittal position of the maxilla ( p = 0.01 ). For mandibular angulation, there was a greater difference between values for Steiner and Ricketts techniques ( p = 0.001 ). In the upper incisor, the results for McNamara and Ricketts techniques were significantly different ( p = 0.004 ). Analysing the airway, subjects with a class II skeletal pattern had a smaller volume than those with a class III pattern ( p = 0.034 ). Conclusion. It may be concluded that skeletal class II patients have a significantly smaller airway volume than class III patients. The skeletal parameter does not always relate to the airway volume; however, the high mandibular angle could be related to the airway conditions.

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Interrelationships Between the Posterior Pharyngeal Space and the Dento-Maxillary Anomalies

European Scientific Journal ESJ ◽

10.19044/esj.2021.v17n17p16 ◽

2021 ◽

Vol 17 (17) ◽

Author(s):

Mihailescu Radu ◽

Serbanoiu Dan Cosmin ◽

Kallos Henrietta Hilda ◽

Mocan Rares

Keyword(s):

Class Ii ◽

Class I ◽

Class Iii ◽

Facial Skeleton ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Obstructive Sleep ◽

Increased Risk ◽

Dentofacial Orthopedics ◽

Hypopnea Syndrome

Introduction: Nocturnal breathing problems have become more common and cause problems during the day for both those affected by this condition and those around them. These problems are caused in most cases by a decrease in the size of the pharyngeal posterior space, which is associated with various abnormalities of the facial skeleton, and the positioning of the tongue. Purpose: The present study has the purpose to determine the existence of a correlation between different facial skeletal abnormalities and the size of the pharyngeal posterior space. Materials and methods: In the present study we performed the analysis of 131 teleradiographs from the database of the department of orthodontics and dentofacial orthopedics within UMFST “Târgu Mureș” performed on patients in order to perform an orthodontic treatment. Patients range in age from 10 to 21 years. Results: To observe the existence of a link between the median differences in values in the lower pharyngeal space between class I and class II, we used the Mann-Whitney U test to compare median values. Thus, the median value in class I is 0, while the median value in class II is 0.3. It was concluded that this difference is statistically significant (p = 0.02). Conclusion: Patients with skeletal class II have smaller dimensions of the lower pharyngeal space than patients with class I and class III. Patients with skeletal class II have an increased risk compared to those with class I or class III of developing obstructive sleep apnea-hypopnea syndrome during their lifetime.

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Perbedaan ukuran sinus maksilaris pada maloklusi kelas I, II, dan III skeletal ditinjau dari radiografi sefalometriThe difference in the maxillary sinus size of skeletal class I, II, and III malocclusions in terms of cephalometric radiographs

Jurnal Kedokteran Gigi Universitas Padjadjaran ◽

10.24198/jkg.v33i1.30240 ◽

2021 ◽

Vol 33 (1) ◽

pp. 53

Author(s):

Brandon Thamran ◽

Mimi Marina Lubis

Keyword(s):

Maxillary Sinus ◽

Class Ii ◽

Class I ◽

Class Iii ◽

Skeletal Class ◽

Skeletal Malocclusion ◽

Skeletal Class Ii ◽

Significant Difference ◽

Males And Females ◽

The Mean

Pendahuluan: Ukuran sinus maksilaris dapat dipengaruhi maloklusi skeletal, oleh karena itu pengetahuan dalam perkembangan dan ukuran sinus maksilaris penting dalam diagnosa dan menentukan rencana perawatan kasus maloklusi. Tujuan penelitian untuk menganalisis perbedaan rerata ukuran sinus maksilaris pada maloklusi kelas I, II, dan III skeletal pada laki-laki dan perempuan. Metode: Jenis penelitian Penelitian deskriptif analitik dilakukan pada 96 pasien RSGM USU usia 18-35 tahun dengan Teknik purposive sampling, terdiri dari 27 relasi rahang Kelas I, 31 Kelas II dan 22 Kelas III. Subjek diperoleh melalui pengukuran metode Steiner. Hasil tracing dipindahkan melalui scanner dan pengukuran luas Sinus Maksilaris dengan program AutoCAD. Hasil: Rerata sinus maksilaris Kelas I skeletal adalah 1492,18268,44 mm2 untuk laki-laki dan 1614,80259,13 mm2 untuk perempuan p=0,275, maka tidak ada perbedaan signifikan antara rerata sinus maksilaris Kelas I skeletal pada laki-laki dan perempuan, Kelas II skeletal adalah 1879,75 mm2 untuk laki-laki dan 1544,41239,47 mm2 untuk perempuan diperoleh p=0,016, maka terdapat perbedaan signifikan antara rerata sinus maksilaris Kelas II skeletal pada laki-laki dan perempuan, dan Kelas III skeletal adalah 1619,36 mm2 untuk laki-laki dan 1489,92 mm2 untuk perempuan diperoleh p=0,239, maka tidak ada perbedaan signifikan antara rerata sinus maksilaris Kelas III skeletal pada laki-laki dan perempuan. Rerata ukuran antar kelompok didapatkan 1572,93 263,72 mm2 untuk Kelas I skeletal, 1609,32 mm2 untuk Kelas II skeletal, dan 1531,11 mm2 untuk Kelas III skeletal dengan p=0,600, Hasil ini menunjukkan tidak ada perbedaan rerata sinus maksilaris pada maloklusi Kelas I, Kelas II dan Kelas III skeletal. Simpulan: Tidak ada perbedaan pada rerata ukuran sinus maksilaris pada maloklusi Kelas I, Kelas II dan Kelas III skeletal.Kata kunci: Ukuran sinus maksilaris, maloklusi skeletal, analisa Steiner, radiogram sefalometri. ABSTRACTIntroduction: Maxillary sinus size can be affected by skeletal malocclusion. Therefore knowledge of maxillary sinus development and size is essential in diagnosing and determining the treatment plan for malocclusion cases. This study was aimed to analyse the mean difference in maxillary sinus size in skeletal class I, II, and III malocclusions in males and females. Methods: This type of study was a descriptive-analytic study conducted on 96 patients at Universitas Sumatera Utara Dental Hospital aged 18-35 years with a purposive sampling technique, consisting of 27 Class I, 31 Class II and 22 Class III jaw relations. Subjects were obtained by measuring the Steiner method. The tracing results were transferred through a scanner and measuring the maxillary sinus area using the AutoCAD program. Results: The mean skeletal Class I maxillary sinus was 1492.18268.44 mm2 for men and 1614,80259.13 mm2 for women p = 0.275, so there was no significant difference between the mean skeletal Class I maxillary sinus in males and females. Class II skeletal is 1879.75 mm2 for men and 1544.41239.47 mm2 for women obtained p = 0.016. Hence, there is a significant difference between the mean skeletal Class II maxillary sinus in males and females, and skeletal Class III is 1619.36 mm2 for men and 1489.92 mm2 for women obtained p = 0.239, so there was no significant difference between the mean skeletal Class III maxillary sinus in males and females. The mean size between groups was 1572.93 263.72 mm2 for skeletal Class I, 1609.32 mm2 for skeletal Class II, and 1531.11 mm2 for skeletal Class III with p = 0.600. skeletal Class I, Class II and Class III malocclusions. Conclusion: There was no difference in mean maxillary sinus size in skeletal Class I, Class II and Class III malocclusions.Keywords: Maxillary sinus size, skeletal malocclusion, Steiner analysis, cephalometric radiograph.

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Evaluation of Facial Esthetics using Golden Proportion Values in Dravidian Population for Different Classes of Malocclusions

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v11ispl4.3850 ◽

2020 ◽

Vol 11 (SPL4) ◽

pp. 418-422

Author(s):

Prasanna Arvind T R ◽

Navaneethan Ramasamy ◽

Sri Rengalakshmi

Keyword(s):

Class Ii ◽

Class I ◽

Class Iii ◽

Golden Proportion ◽

Skeletal Class ◽

Skeletal Malocclusion ◽

Skeletal Class Ii ◽

Facial Esthetics ◽

Significant Difference ◽

Facial Proportions

Improvement in esthetic appearance and functional occlusion are the pillars of contemporary orthodontic procedures. The aim of this study was to assess variations in facial proportions between skeletal classes I, II, III populations in order to establish objective departures from Golden Proportion norms. The study sample was divided into three groups based on the skeletal malocclusion, namely skeletal class I, class II and class III groups. Various markers were identified in these photographs in order to define facial symmetry and balance with the ideal values. Golden Proportion values were compared with that of the obtained results, and these values were checked for skeletal class I, II, III malocclusions. Our study showed a significant difference between skeletal class II and III malocclusions when correlated with Golden Proportion values. Skeletal Class I malocclusions showed a greater correlation with golden proportion values. Golden proportion ratios are more valid in cases of skeletal class I malocclusions. Hence, the objective of treating class II and class III malocclusions should be more focused on attaining values closer to the desired ratio for optimal facial balance and symmetry.

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A Cephalometric Evaluation of Pretreatment and Post-treatment Outcome using Tetragon Analysis: A Retrospective Study

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1306 ◽

2013 ◽

Vol 14 (2) ◽

pp. 238-243

Author(s):

Sunil S Nayak ◽

C Pushpalatha ◽

Vinny S Bhasin ◽

Praveen Tammannavar ◽

Vinod Viswanathan

Keyword(s):

Treatment Outcome ◽

Retrospective Study ◽

Class Ii ◽

Post Treatment ◽

Class I ◽

Plane Angle ◽

Class Iii ◽

Fixed Appliance ◽

Skeletal Class ◽

Skeletal Class Ii

ABSTRACT Statement of problem Few cephalometric analyses have been put forward to assess the treatment outcome after orthodontic treatment. However, these analyses are somewhat complicated and time consuming. The Tetragon analysis is introduced with measurement of treatment outcome as one of its objectives. Purpose of study The study was undertaken to evaluate the treatment outcome by checking the skeletal and dental changes using pretreatment and post-treatment radiographs and to evaluate the efficiency of treatment in the Department of Orthodontics, College of Dental Sciences, Davangere, using the Tetragon analysis. Materials and methods Records of 35 finished patients with fixed orthodontic therapy using preadjusted edgewise appliance were selected. The samples were analyzed separately for the skeletal parameters consisting of skeletal class I, II and III using Tetragon analysis. Results The post-treatment reduction of upper incisor palatal plane angle was found to be statistically significant in skeletal class I (p < 0.01) and skeletal class II patients (p < 0.05). The post-treatment increase in interincisal angle was found to be statistically significant in skeletal class I (p < 0.01) class II patients (p < 0.05). Conclusion Fixed appliance therapy reduced the proclination of upper incisors and increased the interincisal angle in skeletal class I and II cases but not in skeletal class III cases. The lower incisal angulation and the maxilla-mandibular plane angle did change significantly and so were the angles of the Trigon. The Tetragon analysis proved easy to measure the treatment outcome. How to cite this article Bhasin VS, Tammannavar P, Pushpalatha C, Nayak SS, Viswanathan V. A Cephalometric Evaluation of Pretreatment and Post-treatment Outcome using Tetragon Analysis: A Retrospective Study. J Contemp Dent Pract 2013;14(2):238-243.

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