Evaluation of Growth and Development of Adolescents’ Dental Arch Asymmetry with Normal Occlusion Using Three-Dimensional Digital Models

Objective. The purpose of this study was to observe the dental arch asymmetry in 12-year-olds with normal occlusion during the early permanent dentition stage. Methods. Ninety-two 12-year-old students (46 males and 46 females) who had normal occlusion during early permanent dentition were selected from a junior high school in Tangshan, China. Once per year for three consecutive years, a dental cast was obtained from each subject, and the cast was scanned with a 3D digital scanner (R700 3D). The median palatal plane (MPP) and transverse palatal plane (TPP) were used as the reference plane for the transverse and anteroposterior measurements, respectively. Results. Most of the dental arch asymmetry indicators decreased with age, but these differences were not statistically significant. The values of the midincisal edge of the upper central incisors (U1), midincisal edge of the upper lateral incisors (U2), upper canine cusp tip (U3), upper first premolar buccal cusp tip (U4), upper second premolar buccal cusp tip (U5), upper first molar mesiobuccal cusp tip (U6MB), and upper first molar distobuccal cusp tip (U6DB) to the TPP were 0.019 mm, 0.279 mm, 0.017 mm, 0.016 mm, 0.016 mm, 0.027 mm, and 0.200 mm, respectively; these values were larger in males than in females ( P < 0.05 ). The values of 2–5, 6MB, and 6DB-TPP were 0.154 mm, 0.102 mm, 0.119 mm, 0.259 mm, 0.206 mm, and 0.123 mm, respectively, larger in the mandibular than in the maxillary dental arch ( P < 0.05 ). The values of the midincisal edge of the lower central incisors (L1), midincisal edge of the lower lateral incisors (L2), lower canine cusp tip (L3), lower first premolar buccal cusp tip (L4), lower second premolar buccal cusp tip (L5), lower first molar mesiobuccal cusp tip (L6MB), and lower first molar distobuccal cusp tip (L6DB) to the MPP were 0.399 mm, 0.197 mm, 0.258 mm, 0.248 mm, 0.214 mm, 0.575 mm, and 0.531 mm, respectively, larger than L1-5, L6MB, and L6DB-TPP ( P < 0.05 ). Conclusion. The asymmetry of the dental arch in 12-to-15-year-olds with normal occlusion did not change significantly with age. The anteroposterior asymmetry of the maxillary dental arch is larger in males than in females. With the exception of the central incisor, the anteroposterior asymmetry of the mandibular dental arch is larger than that of the maxillary dental arch. The transverse asymmetry of the mandibular dental arch is larger than the anteroposterior asymmetry.

Download Full-text

Evaluation of Growth and Development of Late Mixed Dentition Upper Dental Arch with Normal Occlusion Using 3-Dimensional Digital Models

Journal of Healthcare Engineering ◽

10.1155/2019/4191848 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8

Author(s):

Dapeng Yang ◽

Shuran Liang ◽

Ke Zhang ◽

Weimin Gao ◽

Yuxing Bai

Keyword(s):

Growth And Development ◽

Three Dimensional ◽

Mixed Dentition ◽

Dental Arch ◽

3 Dimensional ◽

Normal Occlusion ◽

Dimensional Measurements ◽

Dimensional Growth ◽

Dental Arch Length ◽

Beijing China

Objective. The purpose of this study was to observe the three-dimensional growth and development of the maxillary arch in 10-year-olds with normal occlusion during the late mixed dentition stage. Methods. Forty-four 10-year-old students (22 males and 22 females) who had normal occlusion during late mixed dentition were selected from an elementary school in Beijing, China. Once per year for three consecutive years, a dental cast was obtained from each subject, and the cast was scanned with a 3D digital scanner (R700 3D). The three-dimensional measurements of the maxillary dental arch and the inclination of the bilateral maxillary first molars were obtained from the digital model. Results. The upper anterior arch length (UAAL), upper total arch length (UTAL), upper inter primary or permanent canine width (UICW), upper intermolar width (UIMW), and upper dental arch length (UDAL) increased by 0.959 mm, 0.583 mm, 0.955 mm, 1.462 mm, and 2.46 mm, respectively, over the two years (P<0.001). UR6BL and UL6BL decreased by 4.416° and 7.133°, respectively, over the two years (P<0.001). The values of the UICW and UIMW were 1.67 mm and 1.86 mm, respectively, larger in males than in females at 12 years old (P<0.01). The change in the UTAL was 0.431 mm greater in males than in females over the 2 years (P<0.05). Conclusion. The UAAL, UTAL, UICW, UIMW, and UDAL in 10- to 12-year-olds with normal occlusion increased with age. The buccolingual inclination of the bilateral maxillary first molars inclined to the palatal side with age. The UICW and UIMW were larger in males than in females at 12 years old. The male UTAL increased more than the female UTAL over the 2 years.

Download Full-text

Clinical Evaluation of Solitary Median Maxillary Central Incisor Syndrome

Case Reports in Dentistry ◽

10.1155/2019/2637825 ◽

2019 ◽

Vol 2019 ◽

pp. 1-5

Author(s):

Malaz M. Mustafa ◽

M. Zakirulla ◽

Ibrahim AlShahrani ◽

Rafi A. Togoo ◽

Zuhair M. Alkahtani ◽

...

Keyword(s):

Growth And Development ◽

Ethnic Origin ◽

Dental Arch ◽

Close Monitoring ◽

Hemifacial Microsomia ◽

Central Incisor ◽

Developmental Abnormalities ◽

Maxillary Central Incisor ◽

Live Births

Solitary median maxillary central incisor (SMMCI) is a rare dental anomaly. It is estimated to occur in 1 : 50,000 live births. The SMMCI tooth differs from the normal central incisor in that the crown form is symmetric and it develops and erupts precisely in the midline of the maxillary dental arch in both primary and permanent dentitions. The presence of SMMCI with hemifacial microsomia (HFM) is a very rare clinical condition. We report a case of SMMCI in a female of African ethnic origin, who presented with SMMCI in permanent dentition with mild nasal stenosis. An early diagnosis of SMMCI is important, since it may be a sign for other severe congenital or developmental abnormalities. Therefore, systematic follow-up and close monitoring of the growth and development of SMMCI patients are crucial.

Download Full-text

GAMBARAN PENGETAHUAN TENTANG TAMPILAN MALOKLUSI PADA SISWA SEKOLAH MENENGAH PERTAMA KRISTEN 67 IMANUEL BAHU

e-GIGI ◽

10.35790/eg.1.1.2013.1926 ◽

2013 ◽

Vol 1 (1) ◽

Author(s):

Ahmad Djunaid ◽

Paulina N. Gunawan ◽

Johanna A. Khoman

Keyword(s):

High School ◽

Junior High School ◽

Speech Processing ◽

Sampling Method ◽

Sampling Methods ◽

Junior High ◽

Dental Arch ◽

Treatment Needs ◽

Appropriate Treatment ◽

Normal Occlusion

Abstract: Malocclusion is a condition that deviates from normal occlusion include irregularity of the teeth in the dental arch such as crowding, protrusif, malposition and harmonious relationship with the opposing teeth. Occurrence of malocclusion in children will lead to many problems such as including impaired of mastication, speech processing as well as aesthetic problems socially impaired. The purpose of this study to describe the knowledge of malocclusion in junior high school 67 Christian Immanuel Bahu. The research is descriptive and sampling method with a total sampling methods. Retrieval of data to find a picture of malocclusions knowledge gained by means of questionnaires by a sample of 88 students. Knowledge of the research lookscale photographs by AC of IOTN in accordance with the composition of his teeth with persentse 44.31%, knowledge of tooth arrangement in accordance with the profile picture based on the percentage of 54.55% and a knowledge of treatment needs in accordance with the percentage of 23.87% appropriate Treatment needs. Keywords: knowledge, malocclusion. Abstrak: Maloklusi merupakan keadaan yang menyimpang dari oklusi normal meliputi ketidakteraturan gigi-geligi dalam lengkung rahang seperti gigi berjejal, protrusif, malposisi maupun hubungan yang tidak harmonis dengan gigi antagonisnya. Terjadinya maloklusi pada anak akan mengakibatkan banyak masalah diantaranya gangguan pengunyahan, proses bicara serta masalah pergaulan karena estetik yang terganggu. Tujuan dari penelitian yaitu untuk mengetahui gambaran pengetahuan tentang maloklusi pada siswa SMP Kristen 67 Imanuel Bahu. Penelitian bersifat deskriptif dan cara pengambilan sampel dengan metode total sampling. Pengambilan data untuk mengetahui gambaran pengetahuan tentang maloklusi diperoleh dengan cara pengisian kuesioner oleh sampel yang berjumlah 88 siswa. Hasil penelitian didapatkan data pengetahuan tampilan berdasarkan skala fotograf AC dari IOTN sesuai dengan susunan giginya dengan persentse 44,31%, pengetahuan tentang susunan gigi sesuai berdasarkan foto profil dengan persentase 54,55% dan pengetahuan tentang kebutuhan perawatan dengan persentase 23,87% sesuai dengan kebutuhan perawatan. Kata kunci: pengetahuan, maloklusi.

Download Full-text

Quantitative Description of the Morphology of the Human Palate by a Mathematical Equation

The Cleft Palate-Craniofacial Journal ◽

10.1597/1545-1569_1998_035_0396_qdotmo_2.3.co_2 ◽

1998 ◽

Vol 35 (5) ◽

pp. 396-401 ◽

Cited By ~ 4

Author(s):

Virgilio F. Ferrario ◽

Chiarella Sforza ◽

Johannes H. Schmitz ◽

Anna Colombo

Keyword(s):

Mathematical Description ◽

Quantitative Description ◽

Three Dimensional ◽

Dental Arch ◽

Mathematical Equation ◽

Hard Tissue ◽

Respiratory Problems ◽

Normal Occlusion ◽

Normal Human ◽

Intercanine Distance

Objective To derive a three-dimensional mathematical description of normal human hard tissue palatal size and shape. Methods The maxillary dental casts of 30 adolescents free from respiratory problems, who had a complete (28 teeth) permanent sound dentition with normal occlusion, were studied. The x, y, z coordinates of several standardized palatal and dental landmarks were obtained with a computerized three-dimensional digitizer. Palatal landmarks were used to derive a mathematical equation of palatal shape in the frontal and sagittal planes. Palatal width, length, frontal and sagittal heights, and sagittal slope, as well as dental arch transverse and anteroposterior dimensions, were computed. Results Neither the size nor the shape of the palate was significantly influenced by gender. Only the intercanine distance was larger (p < .025) in males than in females. Conclusions Data collected in the present investigation could represent a first database for the quantitative description of normal human palatal morphology in subjects with a complete permanent dentition.

Download Full-text

Three dimensional structural analysis between dental arch and basal bone in normal occlusion

The Korean Journal of Orthodontics ◽

10.4041/kjod.2011.41.4.224 ◽

2011 ◽

Vol 41 (4) ◽

pp. 224 ◽

Cited By ~ 1

Author(s):

Jee-Tae Kim ◽

Jin-Woo Lee

Keyword(s):

Structural Analysis ◽

Three Dimensional ◽

Dental Arch ◽

Basal Bone ◽

Normal Occlusion

Download Full-text

Qualitative and quantitative evaluation of central incisor movement by integration of three-dimensional images of dental cast and cephalogram

Orthodontic Waves ◽

10.1016/j.odw.2015.02.003 ◽

2015 ◽

Vol 74 (3) ◽

pp. 62-68 ◽

Cited By ~ 2

Author(s):

Hiroko Yanagida ◽

Yoshiyuki Koga ◽

Hiromi Rokutanda ◽

Jun-ya Tominaga ◽

Noriaki Yoshida

Keyword(s):

Quantitative Evaluation ◽

Three Dimensional ◽

Central Incisor ◽

Qualitative And Quantitative ◽

Three Dimensional Images ◽

Dental Cast

Download Full-text

Dental Arch Dimensions in Class II division 1 Malocclusions with Mandibular Deficiency

The Angle Orthodontist ◽

10.2319/022307-89.1 ◽

2008 ◽

Vol 78 (3) ◽

pp. 466-474 ◽

Cited By ~ 6

Author(s):

Omar Gabriel da Silva Filho ◽

Flávio Mauro Ferrari Júnior ◽

Terumi Okada Ozawa

Keyword(s):

Class Ii ◽

Permanent Dentition ◽

Class I ◽

Dental Arch ◽

Normal Occlusion ◽

Division 1 ◽

Normal Class ◽

Class Ii Division 1

Abstract Objective: To test the hypothesis that there is no difference in the dimensions of the upper and lower dental arches in Class II division 1 malocclusion with a mandibular deficiency compared to normal Class I occlusion dental arches. Materials and Methods: Photocopies of the dental arches of 48 patients exhibiting Class II division 1 malocclusion with mandibular deficiency and of 51 individuals with normal occlusion were compared. Mandibular deficiency was diagnosed clinically. All 99 individuals were in the permanent dentition. The ages of the subjects ranged from 11 years 4 months to 20 years (mean age = 12 years 5 months). Results: When compared to subjects with normal occlusion, the upper dental arches of the Class II division 1 patients presented reduced transverse dimensions and longer sagittal dimensions while the lower arches were less influenced. Conclusion: The hypothesis is rejected. Significant differences are present between the dimensions of the upper and lower dental arches in Class II division 1 malocclusion (with a mandibular deficiency and in the permanent dentition) compared to normal Class I occlusion dental arches.

Download Full-text

Correlation between maxillary central incisor crown morphology and mandibular dental arch form in normal occlusion subjects

Brazilian Dental Journal ◽

10.1590/s0103-64402012000200010 ◽

2012 ◽

Vol 23 (2) ◽

pp. 149-153 ◽

Cited By ~ 4

Author(s):

Luiz Renato Paranhos ◽

Carolina Souto Lima ◽

Ricardo Henrique Alves da Silva ◽

Eduardo Daruge Júnior ◽

Fernando Cesar Torres

Keyword(s):

Scientific Basis ◽

Dental Arch ◽

Central Incisor ◽

Chi Square ◽

Tooth Shape ◽

Significance Level ◽

Maxillary Central Incisor ◽

Kappa Test ◽

Normal Occlusion ◽

Chi Square Test

The aim of this study was to evaluate the correlation between the morphology of the mandibular dental arch and the maxillary central incisor crown. Cast models from 51 Caucasian individuals, older than 15 years, with optimal occlusion, no previous orthodontic treatment, featuring 4 of the 6 keys to normal occlusion by Andrews (the first being mandatory) were observed. The models were digitalized using a 3D scanner, and images of the maxillary central incisor and mandibular dental arch were obtained. These were printed and placed in an album below pre-set models of arches and dental crowns, and distributed to 12 dental surgeons, who were asked to choose which shape was most in accordance with the models and crown presented. The Kappa test was performed to evaluate the concordance among evaluators while the chi-square test was used to verify the association between the dental arch and central incisor morphology, at a 5% significance level. The Kappa test showed moderate agreement among evaluators for both variables of this study, and the chi-square test showed no significant association between tooth shape and mandibular dental arch morphology. It may be concluded that the use of arch morphology as a diagnostic method to determine the shape of the maxillary central incisor is not appropriate. Further research is necessary to assess tooth shape using a stricter scientific basis.

Download Full-text

A New Method to Evaluate Trueness and Precision of Digital and Conventional Impression Techniques for Complete Dental Arch

Applied Sciences ◽

10.3390/app11104612 ◽

2021 ◽

Vol 11 (10) ◽

pp. 4612

Author(s):

KweonSoo Seo ◽

Sunjai Kim

Keyword(s):

Intraclass Correlation ◽

Three Dimensional ◽

New Method ◽

Digital Impression ◽

Dental Arch ◽

Digital Models ◽

Digital Impressions ◽

Measuring Machine ◽

Master Model ◽

Conventional Impression

Purpose: The aim of this study was to present a new method to analyze the three-dimensional accuracy of complete-arch dental impressions and verify the reliability of the method. Additionally, the accuracies of conventional and intraoral digital impressions were compared using the new method. Methods: A master model was fabricated using 14 milled polyetheretherketone cylinders and a maxillary acrylic model. Each cylinder was positioned and named according to its corresponding tooth position. Twenty-five definitive stone casts were fabricated using conventional impressions of the master model. An intraoral scanner was used to scan the master model 25 times to fabricate 25 digital models. A coordinate measuring machine was used to physically probe each cylinder in the master model and definitive casts. An inspection software was used to probe cylinders of digital models. A three-dimensional part coordinate system was defined and used to compute the centroid coordinate of each cylinder. Intraclass correlation coefficient (ICC) was evaluated to examine the reliability of the new method. Independent two sample t-test was performed to compare the trueness and precision of conventional and intraoral digital impressions (α = 0.05). Results: ICC results showed that, the new method had almost perfect reliability for the measurements of the master model, conventional and digital impression. Conventional impression showed more accurate absolute trueness and precision than intraoral digital impression for most of the tooth positions (p < 0.05). Conclusions: The new method was reliable to analyze the three-dimensional deviation of complete-arch impressions. Conventional impression was still more accurate than digital intraoral impression for complete arches.

Download Full-text