Overlap of the Primary Dentition in Children

2009 ◽  
Vol 33 (3) ◽  
pp. 269-274
Author(s):  
Issei Saitoh ◽  
Haruaki Hayasaki ◽  
Emi Inada ◽  
Tomoaki Maruyama ◽  
Yoshihiko Takemoto ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Primary Dentition ◽  
Dental Arch ◽  
Second Molar ◽  
Dental Models ◽  
Arch Forms ◽  
Best Fit ◽  
Single Coordinate ◽  
Variable Measurement ◽  
Primary Canine

Objective: The aim of the present study was to estimate the amount of overlap in children with the primary dentition. Study design: The sample consisted of 20 Japanese boys between 3 and 5 years of age (mean age:4years 10 months). Landmarks on their maxillary and mandibular dental models were digitized using a three-dimensional mechanical digitizer in a single coordinate system. Multilevel statistical models created best-fit polynomial curves to determine overbite, overjet and buccal height of all primary teeth and describe the dental arch forms. Results: No significant side differences were detected. The primary canine showed the largest overbite (1.87 mm) and buccal height (9.07 mm). The primary second molar exhibited the largest ovejet (2.76 mm). Buccal height was the least variable measurement. Conclusion: Occlusal relationships of the primary dentition were evaluated in 3-dimensions, establishing overlap variables for clinical diagnosis and treatment planning.

scholarly journals Association of breastfeeding and three-dimensional dental arch relationships in primary dentition

2015 ◽  
Vol 15 (1) ◽  
Author(s):  
Fung Hou Kumoi Mineaki Howard Sum ◽  
Linkun Zhang ◽  
Hiu Tung Bonnie Ling ◽  
Cindy Po Wan Yeung ◽  
Kar Yan Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Primary Dentition ◽  
Dental Arch

scholarly journals Three-dimensional analysis of dental arch forms in Italian population

2018 ◽  
Vol 19 (1) ◽  
Author(s):  
Bruno Oliva ◽  
Simone Sferra ◽  
Anna Lucia Greco ◽  
Francesco Valente ◽  
Cristina Grippaudo
Keyword(s):  
Dimensional Analysis ◽  
Three Dimensional ◽  
Dental Arch ◽  
Italian Population ◽  
Arch Forms

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

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.

Three-dimensional dental arch and palatal form changes after extraction and nonextraction treatment. Part 2. Palatal volume and height

2004 ◽  
Vol 126 (1) ◽  
pp. 82-90 ◽  
Author(s):  
Wolfgang Heiser ◽  
Andreas Niederwanger ◽  
Beatrix Bancher ◽  
Gabriele Bittermann ◽  
Nikolaus Neunteufel ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Dental Arch

Assessment of Volumetric Changes with a Best-Fit Method in Three-Dimensional Stereophotograms

2012 ◽  
Vol 49 (4) ◽  
pp. 472-476 ◽  
Author(s):  
E.M. Ongkosuwito ◽  
J.A.C. Goos ◽  
E. Wattel ◽  
K.G.H. Van Der Wal ◽  
L.N.A. Van Adrichem ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Best Fit

scholarly journals {(3S,5R)-5-(2,4-Difluorophenyl)-5-[(1H-1,2,4-triazol-1-yl)methyl]tetrahydrofuran-3-yl}methyl 4-methylbenzenesulfonate

IUCrData ◽  
2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Qing-Shuang Ma ◽  
Xiao-Guang Wang ◽  
Lei Xu ◽  
Sun Bin ◽  
Dao-Hong Xia ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Axis Direction ◽  
Envelope Conformation ◽  
Compound C ◽  
Best Fit

In the title compound, C21H21F2N3O4S, the tetrahydrofuran ring adopts an envelope conformation with the β-C atom positioned at the flap. The triazole, difluorophenyl and tolyl rings of the various substituents on the tetrahydrofuran ring are inclined at 77.88 (12), 83.81 (10) and 81.00 (10)°, respectively, to the best-fit mean plane through the five atoms of the tetrahydrofuran ring. In the crystal, weak C—H...O and C—H...F hydrogen bonds link the molecules into a three-dimensional structure, with molecules stacked along thea-axis direction.

scholarly journals Accuracy of digital dental models and three-dimensional printed dental models in linear measurements and Bolton analysis

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 180
Author(s):  
William Suryajaya ◽  
Maria Purbiati ◽  
Nada Ismah
Keyword(s):  
Treatment Planning ◽  
Interobserver Reliability ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
3D Printer ◽  
Intraoral Scanner ◽  
Linear Measurements ◽  
Dental Model ◽  
Dental Models ◽  
Digital Dental Models

Background: Due to advances in digital technology, it is possible to obtain digital dental models through intraoral scanning. The stereolithographic data collected from the scanner can subsequently be printed into a three-dimensional dental model in resinic material. However, the accuracy between digital dental models and printed dental models needs to be evaluated since it might affect diagnosis and treatment planning in orthodontic treatment. This study aimed to evaluate the accuracy of digital models scanned by a Trios intraoral scanner and three-dimensional dental models printed using a Formlabs 2 3D printer in linear measurements and Bolton analysis. Methods: A total of 35 subjects were included in this study. All subjects were scanned using a Trios intraoral scanner to obtain digital study models. Stereolithographic data from previous scanning was printed using a Formlabs 2 3D printer to obtain printed study models. Mesiodistal, intercanine, intermolar, and Bolton analysis from all types of study models were measured. The intraclass correlation coefficient was used to assess intraobserver and interobserver reliability. All data were then statistically analyzed. Results: The reliability tests were high for both intraobserver and interobserver reliability, which demonstrates high reproducibility for all measurements on all model types. Most of the data compared between study models showed no statistically significant differences, though some data differed significantly. However, the differences are considered clinically insignificant. Conclusion: Digital dental models and three-dimensional printed dental models may be used interchangeably with plaster dental models for diagnostic and treatment planning purposes. Keywords: Accuracy, 3D printing, digital dental model, printed dental model.

scholarly journals The study of essential factors that affect mandibular dental arch forms by cluster analysis

2013 ◽  
Vol 34 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Michiko Nakatsuka ◽  
Chun-Ying An ◽  
Aiko Morishita ◽  
신제원 ◽  
Yasutomo Iwai ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Dental Arch ◽  
Arch Forms

Geometry and respiratory displacement of human ribs

1987 ◽  
Vol 62 (5) ◽  
pp. 1872-1877 ◽  
Author(s):  
T. A. Wilson ◽  
K. Rehder ◽  
S. Krayer ◽  
E. A. Hoffman ◽  
C. G. Whitney ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Geometrical Parameters ◽  
Small Component ◽  
X Ray ◽  
Lung Capacity ◽  
Circular Arcs ◽  
Residual Capacity ◽  
X Ray Computed ◽  
Best Fit ◽  
Bucket Handle

The three-dimensional coordinates of points in the ribs of two supine relaxed males, holding their breath at functional residual capacity (FRC) and with their glottis closed at total lung capacity (TLC), were obtained from volumetric X-ray computed tomographical images. The orientation of planes that best fit the data for each rib at each lung volume and the circular arcs that fit the points in the planes of the ribs were determined, and average values of these geometrical parameters for ribs 3–7 are reported. The planes of the ribs at TLC can be described as displaced from the planes at FRC by a rotation about an axis that passes near the spine. The pump handle and bucket handle components of rotation are 11 and 13 degrees, respectively, for rib 3 and both decrease with increasing rib number to 7 and 10 degrees at rib 7. The angles between the axes of rotation and the midplane are approximately 35 degrees for all 5 ribs. The radii of the circular arcs fit to the data at TLC are slightly larger than those at FRC, and this suggests that there is a small component of rotation normal to the plane of the rib.

The Relationship between Arch Dimensions and the 5-Year Index in the Primary Dentition of Patients with Complete UCLP

2002 ◽  
Vol 39 (6) ◽  
pp. 635-640 ◽  
Author(s):  
A.T. Dibiase ◽  
D.D. Dibiase ◽  
N.J. Hay ◽  
B.C. Sommerlad
Keyword(s):  
Rank Correlation ◽  
Primary Dentition ◽  
Dental Arch ◽  
Growth Study ◽  
Spearman’S Rank Correlation ◽  
Primary Surgery ◽  
Transverse Arch ◽  
Spearman’S Rank Correlation Coefficient ◽  
The Relationship ◽  
Maxillary Arch

Objective To compare dental arch dimensions of children in the primary dentition with repaired unilateral clefts of the lip and palate (UCLP) to a noncleft group of a similar age and determine how the dimensions of the cleft arches relate to an index of treatment outcome. Method Dental study casts of 44 5- to 6-year-olds with complete UCLP (22 boys and 22 girls) from a single center, whose primary surgery had been carried out by one surgeon, were matched for age, sex, and ethnicity with dental study casts from a longitudinal growth study. Analysis of variance was used to ascertain differences in arch dimensions between the two groups. The cleft group casts were then assessed with an established index of surgical outcome, the 5-year-old index. Spearman's rank correlation coefficient was used to see how the arch dimensions of the cleft group related to the categories of the index. Results and Conclusions Maxillary arch dimensions were significantly smaller in the cleft group than in the noncleft group, irrespective of sex (p < .05). In the mandibular arch, there was no difference between the cleft and noncleft groups (p > .05). Maxillary arch dimensions of the cleft group correlated significantly with the 5-year-old index for arch length and intercanine width (p < .05) but not intermolar width (p = .842). This would suggest that the 5-year-old index is a suitable tool for assessing the outcome of treatment in the primary dentition for anteroposterior and anterior transverse arch dimensions.

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