scholarly journals Bias Evaluation of the Accuracy of Two Extraoral Scanners and an Intraoral Scanner Based on ADA Standards

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Naiyu Cui ◽  
Jiayin Wang ◽  
Xingyu Hou ◽  
Shixun Sun ◽  
Qixuan Huang ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Rapid Development ◽  
Subsequent Treatment ◽  
National Standard ◽  
Mean Deviation ◽  
Intraoral Scanner ◽  
Point Matching ◽  
Three Samples ◽  
Computer Aided ◽  
Measuring Machine

The spread and application of computer-aided design/computer-aided manufacturing (CAD/CAM) technology have contributed to the rapid development of digitalization in dentistry. The accuracy of scan results is closely related to the devising subsequent treatment plans and outcomes. Professional standards for evaluating scanners are specified in the American National Standard/American Dental Association Standard 132 (ANSI/ADA No. 132). The aims of this study were to use the three samples mentioned in ANSI/ADA No. 132 and evaluate the accuracy and reproducibility of two extraoral scanners and an intraoral scanner based on the inspection standards recommended by ANSI/ADA No. 132. In this study, two trained operators used two extraoral scanners (E4, 3Shape, Denmark & SHINING DS100+, Shining, China) and an intraoral scanner (TRIOS SERIES3, 3Shape, Denmark) to perform 30 scans of each of the three samples at a temperature of 25 ± 2 ° C and export standard tessellation language files and used reverse engineering software to perform measurements and iterative nearest point matching experiments. The measured values obtained were compared with the reference values measured by a coordinate measuring machine (NC8107, Leader Metrology, USA). We performed a normal distribution test (Shapiro-Wilk test), the nonparametric Kruskal-Wallis test, and an independent-samples t -test to analyze the reproducibility of each scan for different models. The experimental results indicate that the trueness and precision of the two extraoral scanners and the intraoral scanner had a slight mean deviation. The trueness and precision of the three scanners on the curved surface and groove areas are poor. The accuracy and reproducibility of E4 outperformed SHINING and TRIOS. The iterative closest point matching experiment also showed good matching results. The two extraoral scanners and the intraoral scanner in this study can meet the basic clinical requirements in terms of accuracy, and we hope that digital technology will be more widely used in dentistry in the future.

Computer-Aided Inspection Planning: A Multisensor High-Level Inspection Planning Strategy

2019 ◽  
Vol 19 (2) ◽  
Author(s):  
Sif Eddine Sadaoui ◽  
Charyar Mehdi-Souzani ◽  
Claire Lartigue
Keyword(s):  
Computer Aided Design ◽  
Main Concern ◽  
Laser Sensor ◽  
Inspection Planning ◽  
Research Attention ◽  
Computer Aided ◽  
Measuring Machine ◽  
High Level ◽  
Computer Aided Inspection ◽  
Touch Probe

Computer-aided inspection planning (CAIP) has gained significant research attention in the last years. So far, most CAIP systems have focused on the use of a touch probe mounted on a coordinate measuring machine (CMM). This article investigates multisensor measurement aiming to perform automatic and efficient inspection plans. High-level inspection planning, which deals with sequencing of measuring operations, is the main concern of inspection planning. This paper presents an automatic approach to generate inspection sequences by combining laser sensor and touch probe, and by giving preference to the measurement using the laser sensor if quality requirements are satisfied. The proposed approach consists of three steps. In the first step, recognition of inspection data from the computer-aided design (CAD) part model is carried out based on the concept of inspection feature (IF), and the extracted information is stored in a database. In the second step, a list of privileged scanner orientations is proposed by analyzing the accessibility of both sensors. In the third step, a sequence of operations is generated iteratively. For a given scanner orientation, the ability of the laser sensor is assessed according to an original process based on fuzzy logic model. If the laser sensor does not meet the ability requirements, touch probe ability is assessed. The proposed approach is implemented and tested on a part defined by its CAD model and specifications.

scholarly journals Accuracy of Digital Impression Taking Using Intraoral Scanner Versus the Conventional Technique

2021 ◽  
Author(s):  
Arash Zarbakhsh ◽  
Ezatollah Jalalian ◽  
Nazanin Samiei ◽  
Mohammad Hossein Mahgoli ◽  
Hadi Kaseb Ghane
Keyword(s):  
Standard Model ◽  
Conventional Method ◽  
Computer Aided Design ◽  
Conventional Technique ◽  
Digital Impression ◽  
Digital Method ◽  
Intraoral Scanner ◽  
The Standard Model ◽  
Computer Aided

Objectives: Intraoral scanners have shown promising results when used as an adjunct or alternative to conventional impression techniques. This study compared the accuracy of digital impression taking using an intraoral scanner versus the conventional technique. Materials and Methods: In this in-vitro experimental study, a typodont molar tooth was prepared as the standard model and scanned by TRIOS intraoral scanner. Ten digital impressions were fabricated as such and intraoral scans were sent to the manufacturers. In the conventional method, using addition silicone impression material, a stone die was fabricated. Using a computer-aided design/computer-aided manufacturing scanner, the die was scanned, and the data were transferred to the software. After the fabrication of frameworks, the replica technique was used. The replicas’ thickness (indicative of the gap between the framework and the model and the accuracy of impression taking) was 12 points. The data were analyzed using student's t-test. Results: The mean thickness of replicas (gap between the internal surface of frameworks and the standard model) at the three points in the buccal, lingual, mesial, and distal sections in the digital impression technique was lower than that in the conventional technique (P<0.0001). In other words, the accuracy of impressions taken by the digital method was significantly higher than those taken by the conventional method. Conclusion: Intraoral digital scanner had significantly higher accuracy than the conventional method in all points. Thus, the digital method can be reliably used as an adjunct or alternative to the conventional method to increase the accuracy of impression taking.

scholarly journals Computer Numerically Controlled Drawing Robot Based on Computer-Aided Design

2021 ◽  
Author(s):  
Antor Mahamudul Hashan ◽  
Abdullah Haidari ◽  
Srishti Saha ◽  
Titas Paul
Keyword(s):  
Open Source ◽  
Computer Aided Design ◽  
Low Cost ◽  
Rapid Development ◽  
Main Idea ◽  
Numerical Control ◽  
Computer Aided ◽  
Complex Circuits ◽  
Open Source Hardware ◽  
Aided Design

Due to the rapid development of technology, the use of numerically controlled machines in the industry is increasing. The main idea behind this paper is computer-aided design (CAD) based low-cost computer numerical control 2D drawing robot that can accurately draw complex circuits, diagrams, logos, etc. The system is created using open-source hardware and software, which makes it available at a low cost. The open-source LibreCAD application has been used for computer-aided design. Geometric data of a CAD model is converted to coordinate points using the python-based F-Engrave application. This system uses the Arduino UNO board as a signal generator of the universal g-code sender without compromising the performance. The proposed drawing robot is designed as a low-cost robot for educational purposes and aims to increase the student's interest in robotics and computer-aided design (CAD) skills to the next level. The drawing robot structure has been developed, and it meets the requirements of low cost with satisfactory experimental results.

scholarly journals Surface Topography-Based Positioning Accuracy of Maxillary Templates Fabricated by the CAD/CAM Technique for Orthognathic Surgery without an Intermediate Splint

2019 ◽  
Vol 9 (22) ◽  
pp. 4928
Author(s):  
Jeong Han ◽  
Soon Hwang
Keyword(s):  
Surface Topography ◽  
Computer Aided Design ◽  
Orthognathic Surgery ◽  
Mean Deviation ◽  
Lateral Direction ◽  
Positioning Accuracy ◽  
Actual Position ◽  
Computer Aided ◽  
Cad Cam ◽  
The Mean

Computer-aided design/computer-aided manufacturing (CAD/CAM)-based maxillary templates can transfer a surgical plan accurately only when the template is positioned correctly. Our study aimed to evaluate the positioning accuracy of the CAD/CAM-based template for maxillary orthognathic surgery using dry skulls. After reconstruction of a three-dimensional (3D) virtual skull model, a surface-based surgical template for Le Fort I osteotomy was designed and fabricated using CAD/CAM and 3D printing technology. To determine accuracy, the deviation of the template between the planned and the actual position and the fitness of the template were evaluated. The mean deviation was 0.41 ± 0.30 mm in the medio-lateral direction, 0.55 ± 0.59 mm in the antero-posterior direction, and 0.69 ± 0.59 mm in the supero-inferior direction. The root mean square deviation between the planned and the actual position of the template was 1.21 ± 0.54 mm. With respect to the fitness of the template, the mean distance between the inner surface of the template and the underlying bone surface was 0.76 ± 0.24 mm. CAD/CAM-based templates showed precise positioning and good fitness. These results suggest that surface topography-based CAD-CAM templates can be considered as an alternative solution in replacing the traditional intermediate splints for the transfer of surgical plans.

RESEARCH ON COLLABORATIVE DESIGN SOFTWARE INTEGRATION BASED ON SOA

2008 ◽  
Vol 07 (01) ◽  
pp. 91-94 ◽  
Author(s):  
YAOGUANG HU ◽  
RAO WANG
Keyword(s):  
Enterprise Resource Planning ◽  
Collaborative Design ◽  
Computer Aided Design ◽  
Rapid Development ◽  
Resource Planning ◽  
Heterogeneous Environment ◽  
Software Integration ◽  
Cooperative Research ◽  
Computer Aided ◽  
Design Software

With the rapid development of economic globalization, more and more complex products have to be designed by the cooperation of the designers in different geographic locations. The effective sharing and deployment of collaborative design software are of great significance to enhance the capability of cooperative research and development of products. To solve the problem of software integration for collaborative design in the distributed and heterogeneous environment, a distributed software integration framework for collaborative product design based on Service Oriented Architecture (SOA) was proposed. Based on Web Service technology, a collaborative design platform was built, which encapsulates the functions of Computer Aided Design (CAD), Computer Aided Engineering (CAE), Product Data Management (PDM) and Enterprise Resource Planning (ERP) software to integrate distributed collaborative design software in heterogeneous environment.

RETRACTED: Auricular prosthesis fabrication using computer-aided design and rapid prototyping technologies

2013 ◽  
Vol 40 (3) ◽  
pp. NP1-NP1
Author(s):  
Mayank Shah
Keyword(s):  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Rapid Development ◽  
Maxillofacial Surgery ◽  
Computer Aided ◽  
Aided Design

At the request of the editor Mayank Shah ‘Auricular prosthesis fabrication using computer-aided design and rapid prototyping technologies’ Prosthetics and Orthotics International, published online before print on October 8, 2013 as doi:10.1177/0309364613504779 has been retracted. This is because it contains unattributed overlap with K. Subburaj, C. Nair, S. Rajesh, S. M. Meshram, B. Ravi ‘Rapid development of auricular prosthesis using CAD and rapid prototyping technologies’ International Journal of Oral & Maxillofacial Surgery 2007; 36: 938–943 doi:10.1016/j.ijom.2007.07.013

scholarly journals Comparison of the Accuracy of Intraoral Scanners Based on the Type of Tooth Preparation for a Single Crown

2021 ◽  
Vol 11 (20) ◽  
pp. 9399
Author(s):  
Dong-Geun Lee ◽  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Computer Aided Design ◽  
Reference Model ◽  
Test Model ◽  
3D Analysis ◽  
Intraoral Scanner ◽  
Single Crown ◽  
Computer Aided ◽  
Tooth Preparation ◽  
Positive Correlations ◽  
Aided Design

The purpose of this study was to evaluate the accuracy of intraoral scanners in 10 abutments (five premolars and five molars) obtained in a dental clinic and to analyze the impacts of the volume and area of abutments on scanning accuracy. Abutment casts were scanned five times with a 3D contact scanner (DS10; Renishaw plc). The five scan files were lined up and then merged, and one high-resolution computer-aided design reference model (CRM) was obtained. To obtain a computer-aided design test model (CTM), three types of intraoral scanners (CS3600 (Carestream Dental), i500 (Medit), and EZIS PO (DDS)) and one type of laboratory scanner (E1; 3Shape) were employed. Using 3D analysis software (Geomagic control X; 3D Systems), the accuracy of the scanners was evaluated, including optimal overlap by optimal alignment. The conformity of the overlapped data was calculated by the root mean square (RMS) value, using the 3D compare function for evaluation. As for statistical analysis, testing was conducted, using one-way and two-way ANOVA and the Tukey HSD test (α = 0.05) for the comparison of the groups. To analyze the correlations of the volume and area of the abutments with accuracy, Pearson’s correlation analysis was conducted (α = 0.00625). Both premolar and molar abutments showed a lower RMS value on the laboratory scanner than on the intraoral scanners, and the RMS value was lower in premolars than in molars (p < 0.001). In the intraoral scanner group, CS3600 showed the best accuracy (p < 0.001). There were significant positive correlations for the volume and area of the abutments with accuracy (p < 0.001). The type, volume, and area of the clinically applicable abutments may affect the accuracy of intraoral scanners; however, the scanners used in the present study showed a clinically acceptable accuracy range, regardless of the type of abutment.

scholarly journals 3D Foot Scan to Custom Shoe Last

2010 ◽  
pp. 110-114
Author(s):  
Nibedita Rout ◽  
Asimananda Khandual ◽  
Yi Fan Zhang ◽  
Ameersing Luximon
Keyword(s):  
Computer Aided Design ◽  
New Technologies ◽  
Rapid Development ◽  
New Techniques ◽  
Shoe Last ◽  
Computer Aided ◽  
Design And Manufacturing ◽  
Best Fitting ◽  
Manufacturing Technologies ◽  
Aided Design

Today’s customers not only look at aesthetic beauty but also quality, comfort and fit. New technologies such as digitization and virtual 3D tailoring are providing more options to consumers and designers in designing different styles with the least possible time. Next to the shoe fashion and style, good fit and comfort are the second important determinant in the purchase of footwear. Although there is a need for better fitting, there are no techniques for fit quantification. In traditional shoemaking, the shoe is categorized by the length and width (or girth), hence there is always a mismatch between the complex foot shape and shoe shape. For the industry in order to meet the demand for better footwear, new techniques for fit quantification is required in order to have a direct mapping form foot to shoe-last (a mold for making shoes). In recent years, with the rapid development of computer technology and advanced design and manufacturing technologies such as computer-aided design (CAD) and computer-aided manufacturing (CAM), the manufacturing of customized shoe lasts is becoming possible. Still research is needed to find the best shoe-last. This paper discusses the basic concepts and current methods being followed to convert foot to shoe-last, retrieve the best fitting shoe last based on the 3D foot scan of the customer, and to obtain customized shoe last.

Parameterized Highway Tunnel Inner Contour Design with ObjectARX

2014 ◽  
Vol 1061-1062 ◽  
pp. 854-857
Author(s):  
Ting Peng ◽  
Qing Fa Zhang ◽  
Xiao Ling Wang
Keyword(s):  
Computer Aided Design ◽  
Design Method ◽  
Rapid Development ◽  
Development Environment ◽  
Design Work ◽  
Highway Tunnel ◽  
Computer Aided ◽  
Tunnel Design ◽  
Design Software ◽  
Contour Design

With the rapid development of economy, dramatic changes have taken place in the highway tunnel industry. However, there is no professional computer aided design software for tunnel design available. Designers tend to spend lots of time to completing the design work. In order to reduce the repeating work of designers, this paper focuses on how to implement parametric design of highway tunnel inner contour with ObjectARX on the platform of CAD. In order to generate inner contour of highway tunnel automatically, parameterized design method is employed. Visual C++ 2010 is chosen as development environment of the computer aided contour design software. With proper control parameters inputted, it generates inner contour of highway tunnel automatically. According to the results, it is a promising approach to improve the design work of high design.

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