The reliability of Little's Irregularity Index for the upper dental arch using three dimensional (3D) digital models

2014 ◽  
Vol 42 (10) ◽  
pp. 1320-1326 ◽  
Author(s):  
Angus Burns ◽  
Adam H. Dowling ◽  
Thérèse M. Garvey ◽  
Garry J.P Fleming
Keyword(s):  
Three Dimensional ◽  
Dental Arch ◽  
Digital Models ◽  
Irregularity Index ◽  
3D Digital Models

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.

Can the intra-examiner variability of Little's Irregularity Index be improved using 3D digital models of study casts?

2013 ◽  
Vol 41 (12) ◽  
pp. 1271-1280 ◽  
Author(s):  
Adam H. Dowling ◽  
Angus Burns ◽  
Donal Macauley ◽  
Thérèse M. Garvey ◽  
Garry J.P. Fleming
Keyword(s):  
Digital Models ◽  
Irregularity Index ◽  
3D Digital Models

scholarly journals Promoting a More Interactive Public Archaeology

2015 ◽  
Vol 3 (3) ◽  
pp. 235-248 ◽  
Author(s):  
Bernard K. Means
Keyword(s):  
Narrow Band ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Public Archaeology ◽  
Archaeological Sites ◽  
Digital Models ◽  
The Past ◽  
Fresh Perspective ◽  
Virginia Commonwealth University ◽  
3D Digital Models

AbstractStewards of the tangible past are increasingly embracing technologies that enable digital preservation of rare and fragile finds. The Virtual Curation Laboratory (VCL) at Virginia Commonwealth University (VCU) partners with museums, cultural heritage locations, and collections repositories to create three-dimensional (3D) digital models of artifacts from archaeological sites distributed across the globe. In the VCL, undergraduate VCU students bring a fresh perspective unburdened by archaeological orthodoxy as they use a laser scanner to record artifact details, edit the resulting digital models, and print plastic replicas that are painted to resemble the original items. The 3D digital models and printed replicas allow for new ways of visualizing the past, while preserving the actual artifacts themselves. These forms of archaeological visualization enable the broader public and not just a narrow band of researchers to dynamically and meaningfully interact with rare and fragile objects in ways that would otherwise not be possible, empowering their own contributions to interpreting, understanding, and reimagining the past. We must embrace co-creation through virtual artifact curation and recognize that, while we sacrifice some control over the stories that are told about the past, more stories will be told and shared as pieces of the past become more accessible.

A Fast Mask Projection Stereolithography Process for Fabricating Digital Models in Minutes

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Yayue Pan ◽  
Chi Zhou ◽  
Yong Chen
Keyword(s):  
High Speed ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Thin Layers ◽  
Digital Models ◽  
Projection System ◽  
Order Of Magnitude ◽  
Projection Stereolithography ◽  
Direct Digital Manufacturing ◽  
3D Digital Models

The purpose of this paper is to present a direct digital manufacturing (DDM) process that is an order of magnitude faster than other DDM processes that are currently available. The developed process is based on a mask-image-projection-based stereolithography (MIP-SL) process, in which a digital micromirror device (DMD) controls projection light to selectively cure liquid photopolymer resin. In order to achieve high-speed fabrication, we investigate the bottom-up projection system in the MIP-SL process. A two-way linear motion approach has been developed for the quick spreading of liquid resin into uniform thin layers. The system design and related settings for achieving a fabrication speed of a few seconds per layer are presented. Additionally, the hardware, software, and material setups for fabricating three-dimensional (3D) digital models are presented. Experimental studies using the developed testbed have been performed to verify the effectiveness and efficiency of the presented fast MIP-SL process. The test results illustrate that the newly developed process can build a moderately sized part within minutes instead of hours that are typically required.

scholarly journals 3D Printing of Human Microbiome Constituents to Understand Spatial Relationships & Shape Parameters in Bacteriology

2021 ◽  
Vol 83 (3) ◽  
pp. 188-190
Author(s):  
Jacques Izard ◽  
Teklu Kuru Gerbaba ◽  
Shara R. P. Yumul
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Human Microbiome ◽  
Digital Models ◽  
Ecological Relationships ◽  
Wide Range ◽  
3D Printers ◽  
Visuospatial Information ◽  
Aided Design ◽  
3D Digital Models

Effective laboratory and classroom demonstration of microbiome size and shape, diversity, and ecological relationships is hampered by a lack of high-resolution, easy-to-use, readily accessible physical or digital models for use in teaching. Three-dimensional (3D) representations are, overall, more effective in communicating visuospatial information, allowing for a better understanding of concepts not directly observable with the unaided eye. Published morphology descriptions and microscopy images were used as the basis for designing 3D digital models, scaled at 20,000×, using computer-aided design software (CAD) and generating printed models of bacteria on mass-market 3D printers. Sixteen models are presented, including rod-shaped, spiral, flask-like, vibroid, and filamentous bacteria as well as different arrangements of cocci. Identical model scaling enables direct comparison as well as design of a wide range of educational plans.

scholarly journals Dental arch monitoring by splines fitting error during orthodontic treatment using 3D digital models

2019 ◽  
Vol 76 (3) ◽  
pp. 233-240 ◽  
Author(s):  
Nemanja Majstorovic ◽  
Srdjan Zivkovic ◽  
Branislav Glisic
Keyword(s):  
Coordinate System ◽  
Computer Aided Design ◽  
Orthodontic Treatment ◽  
Maximum Error ◽  
Average Error ◽  
Dental Arch ◽  
Digital Models ◽  
Initial State ◽  
Average Deviation ◽  
3D Digital Models

Backrgound/Aim. Researchers in the field of dentistry have been conducting research into modelling and defining dental arches equitations. Nowadays, when 3D digital modelling is commonly utilized in dentistry, the approach to modelling, analysis and synthesis has changed. Clinical researches are related to aesthetic and functional analysis. The aim of this study was to increase repeatability and accuracy of defining and determining the coordinate system of the jaw as well as to defining mathematical criteria for monitoring and evaluating orthodontic treatment. Methods. In this study, we used the plaster models of the jaw, optical scanner with structured light, 3D digital models, computer aided design (CAD) engineering tools adjusting the coordinate system, spline fitting of 3rd, 4th, 5th, 6th, 7th and 8th degrees. Results. Splines of 3rd, 4th, 5th, 6th, 7th and 8th degrees were fitted from the initial state (K0) in all 10 successive controls (K1, K2, K3,?, K10). All splines were fitted through 12 points, from the right to the left side of the jaw: 6-5-4-3-2-1-1-2-3-4-5-6. Tabular and graphic presentations of the maximum and average deviation of dental arch fitting curves in successive controls were given. Conclusion. The parameters of the maximum and average errors of fitting curves converge the dental arch values that are lower than the accuracy of the used optical scanners. The average error of fitting provides a general picture of the entire dental arch at each stage of treatment. Maximum error fitting points at a specified tooth where the largest deviation. <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/VSP190515051E">10.2298/VSP190515051E</a><u></b></font>

scholarly journals Three-Dimensional Measurement and Three-Dimensional Printing of Giant Coastal Rocks

2021 ◽  
Vol 10 (6) ◽  
pp. 404
Author(s):  
Zhiyi Gao ◽  
Akio Doi ◽  
Kenji Sakakibara ◽  
Tomonaru Hosokawa ◽  
Masahiro Harata
Keyword(s):  
Effective Means ◽  
Measurement Techniques ◽  
Three Dimensional ◽  
Satellite System ◽  
Shape Reconstruction ◽  
3D Measurement ◽  
Digital Models ◽  
Cloud Data ◽  
3D Shape Reconstruction ◽  
3D Digital Models

In recent years, the use of three-dimensional (3D) measurement and printing technologies has become an effective means of analyzing and reproducing both physical and natural objects, regardless of size. However, in some complex environments, such as coastal environments, it is difficult to obtain the required data by conventional measurement methods. In this paper, we describe our efforts to archive and digitally reproduce a giant coastal rock formation known as Sanouiwa, a famous site off the coast of Miyako City, Iwate Prefecture, Japan. We used two different 3D measurement techniques. The first involved taking pictures using a drone-mounted camera, and the second involved the use of global navigation satellite system data. The point cloud data generated from the high-resolution camera images were integrated using 3D shape reconstruction software, and 3D digital models were created for use in tourism promotion and environmental protection awareness initiatives. Finally, we fabricated the 3D digital models of the rocks with 3D printers for use as museum exhibitions, school curriculum materials, and related applications.

scholarly journals Erratum

2019 ◽  
Vol 76 (5) ◽  
pp. 563-563
Author(s):  
E Editorial
Keyword(s):  
Orthodontic Treatment ◽  
Dental Arch ◽  
Digital Models ◽  
Fitting Error ◽  
3D Digital Models ◽  
Font Color

In the article by Nemanja V. Majstorovic, Srdjan P. Zivkovic, Branislav R. Glisic. Dental arch monitoring by splines fitting error during orthodontic treatment using 3D digital models. Vojnosanit Pregle 2019; 76(3):233-240 (https://doi.org/10.2298/VSP161212067M), the two first authors (Nemanja V. Majstorovic and Srdjan P. Zivkovic) have equal value. The list of the authors should have read: 1Nemanja V. Majstorovic, 1Srdjan P. Zivkovic, Branislav R. Glisic. <br><br><font color="red"><b> Link to the corrected article <u><a href="http://dx.doi.org/10.2298/VSP161212067M">10.2298/VSP161212067M</a></b></u>

scholarly journals The Assessment of 3D Digital Models Using GOSLON Yardstick Index: Exploring Confounding Factors Responsible for Unfavourable Treatment Outcome in Multi-Population Children With UCLP

2021 ◽  
Vol 9 ◽  
Author(s):  
Sanjida Haque ◽  
Mohd Fadhli Khamis ◽  
Mohammad Khursheed Alam ◽  
Amir Wan Muhamad Wan Ahmad
Keyword(s):  
Family History ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Dental Arch ◽  
Kappa Statistics ◽  
Class Iii ◽  
Digital Models ◽  
History Of ◽  
Bangladeshi Population ◽  
3D Digital Models

To evaluate dental arch relationship (DAR) using GOSLON Yardstick and also to explore the association between multiple factors (age, gender, UCLP types, UCLP side, Family history of cleft, family history of Class III malocclusion, techniques of cheiloplasty, techniques of palatoplasty) and DAR in children unilateral cleft lip and palate (UCLP) in different populations. Two hundred fifty-five laser scanned 3D digital models (LS3DM) of UCLP children (5–12 years) from Malaysia, Bangladesh, and Pakistan were included. The intra- and inter-examiner agreements were evaluated by kappa statistics, to compare the GOSLON mean score between the populations and to explore the responsible factors that affect DAR, one way ANOVA, and crude logistic regression analysis was used, respectively. The mean GOSLON score was 2.97; 3.40 and 3.09 in Malaysia, Bangladesh, and Pakistan, respectively. Twenty seven, 40, and 30 subjects were in unfavourable (category rating 4 and 5) groups in Malaysia, Bangladesh, and Pakistan, respectively. A significant association was found between techniques of palatoplasty (p = 0.03; p = 0.04 and p = 0.04 in Malaysia, Bangladesh, and Pakistan, respectively) and unfavourable DAR. Different cheiloplasty techniques (p = 0.04) and gender (p = 0.03) also exhibited noteworthy associations with unfavourable DAR in the Bangladeshi population. Bardach techniques of palatoplasty were significantly associated with unfavourable DAR in all three populations. Moreover, male UCLP and modified Millard techniques of cheiloplasty were also associated with unfavourable DAR in the Bangladeshi population.

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