scholarly journals Restorative Space Analysis by Jaw Motion Tracking Using a Template in Completely Edentulous Patients

2021 ◽  
Vol 11 (9) ◽  
pp. 3933
Author(s):  
Chol-Gwan Han ◽  
Young-Bum Park ◽  
June-Sung Shim ◽  
Jong-Eun Kim
Keyword(s):  
Computer Aided Design ◽  
Motion Tracking ◽  
Alternative Technique ◽  
Optical Scanner ◽  
Movement Data ◽  
Impression Materials ◽  
Computer Aided ◽  
Edentulous Patients ◽  
Manufacturing Technologies ◽  
Opening And Closing

Improvements in computer-aided design/computer-aided manufacturing technologies have led to multiple attempts being made to simplify and improve the workflow of prosthesis fabrication for completely edentulous patients. However, most attempts still involve the conventional methods of impression-making and recording the maxillomandibular relationships using alginate, rubber impression materials, and wax materials. In the case of a completely edentulous arch, the presence of movable tissues and the absence of stable landmarks make it difficult to perform direct digitization using an intraoral scanner and to digitally determine the vertical dimension. In the alternative technique described herein, data are obtained by scanning a template such as the patient’s existing old dentures and jaw movement data using target materials and an optical scanner, and an appropriate maxillomandibular relationship that has the desired restorative space is determined on the basis of the obtained trajectory of mandibular movements while opening and closing the mouth. After designing dentures on the basis of the newly established maxillomandibular relationships and performing a try-in process, the final dentures can be manufactured. This alternative technique can reduce the need for multiple visits and complex procedures, improving the workflow for fabricating prostheses with the correct maxillomandibular relationships for individual patients.

Laser Additive Manufacturing

3D Printing ◽  
2017 ◽  
pp. 154-171 ◽  
Author(s):  
Rasheedat M. Mahamood ◽  
Esther T. Akinlabi
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Computer Aided Design ◽  
Selective Laser Sintering ◽  
Three Dimensional ◽  
Cad Model ◽  
Laser Additive Manufacturing ◽  
Computer Aided ◽  
Manufacturing Technologies ◽  
Aided Design

Laser additive manufacturing is an advanced manufacturing process for making prototypes as well as functional parts directly from the three dimensional (3D) Computer-Aided Design (CAD) model of the part and the parts are built up adding materials layer after layer, until the part is competed. Of all the additive manufacturing process, laser additive manufacturing is more favoured because of the advantages that laser offers. Laser is characterized by collimated linear beam that can be accurately controlled. This chapter brings to light, the various laser additive manufacturing technologies such as: - selective laser sintering and melting, stereolithography and laser metal deposition. Each of these laser additive manufacturing technologies are described with their merits and demerits as well as their areas of applications. Properties of some of the parts produced through these processes are also reviewed in this chapter.

scholarly journals Influence of milling systems and marginal configurations on the fit of yttrium stabilized tetragonal zirconia polycrystals (Y-TZP)’ copings

2020 ◽  
Vol 18 ◽  
pp. 228080002092451
Author(s):  
Khulud A Al-Aali ◽  
Mohammed S. Bin-Shuwaish ◽  
Aasem M Alhenaki ◽  
Khold Al Ahdal ◽  
Laila Al Deeb ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Tetragonal Zirconia ◽  
Finish Line ◽  
Marginal Fit ◽  
Optical Scanner ◽  
Type Iv ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design ◽  
System 1

Objective: The aim of this study was to evaluate marginal fit of yttrium tetragonal zirconia polycrystals (Y-TZP)’ copings with different finish line designs fabricated with various digital scanners and milling systems. Methods: Three model plastic teeth were prepared with three finish line designs: Design-1, continuous chamfer; Design-2, chamfer with shallow depression; Design-3, chamfer with deep depression. The “master models” were replicated using elastomeric polyvinyl siloxane impression material and poured in type IV stone generating 90 dies, 30 dies for each design. Dies were scanned and copings were milled utilizing three digital scanners and computer-aided design/computer-aided manufacturing (CAD/CAM) systems: System-1, InEos Red Scan (Sirona Dental Systems, Germany), Vitablocks® Mark II (VITA, Germany) copings milled by Cerec® inLab (Sirona Dental Systems, Germany); System-2, Cerec® AC Connect with BlueCam (Sirona Dental Systems, Germany), Vitablocks® Mark II (VITA, Germany) copings milled by Cerec® inLab (Sirona Dental Systems, Germany); and System-3, NobleProcera™ Optical Scanner (NobleBiocare™), procera zirconia coping milled by a Noble Procera™ milling machine (NobleBiocare™). Copings were seated on their respective “master models” and secured with uniform force. Eight measurements per coping were performed at pre-established points, with a metallurgical microscope (Zeiss, Germany) connected to a high precision digital video-micrometer (Javelin JV6000, California, USA) at 200 × magnification. Results: The tested systems demonstrated marginal gaps ranging from 12.4 to 26.6 µm. Results for marginal fit of milled copings fabricated using three systems with different finish line designs differed significantly ( p < 0.05). Procera zirconia copings scanned and milled with NobleProcera™ exhibited significantly lower marginal gaps compared to other specimen groups. However, InEos Red Scan/Vitablocks® Mark II/Cerec® inLab showed maximum marginal gaps among the study specimens. Conclusions: CAD-CAM manufactured Y-TZP’ copings exhibited marginal gaps ranging from 12.49 to 26.6 µm. The CAD-CAM fabrication system was a significant factor influencing the marginal misfit of Y-TZP’ copings. Margin design exhibited system dependent influence on the marginal misfit. Marginal misfit observed for all systems were within clinically acceptable parameters.

scholarly journals Implant Impression Making: Take-Off Guide for Beginners

2021 ◽  
Author(s):  
Aaina Dhanda ◽  
Tarun Kalra ◽  
Manjit Kumar ◽  
Ajay Bansal ◽  
Ruchi Sharma
Keyword(s):  
Computer Aided Design ◽  
Dimensional Accuracy ◽  
Computer Assisted ◽  
Impression Materials ◽  
Starting Point ◽  
Irreversible Hydrocolloid ◽  
Passive Fit ◽  
Edentulous Patients ◽  
Aided Design ◽  
Relationship Of

AbstractDental implants are fixtures that constitute for the replacements of the root of a missing natural tooth. Dental implant therapy has been widely used for the restoration of partially and fully edentulous patients. The implant literature emphasizes the importance of a passively fitting prosthesis to prevent prosthodontic complications or even loss of fixture integration. Failure to achieve a passively fitting prosthesis and force tightening of superstructure may result in complications such as abutment, framework, and gold screw loosening or fracture. Various materials that can be used for making an implant impression are polyether, polyvinylsiloxane, condensation silicone, polysulfide, irreversible hydrocolloid material, and various others. There are various studies in relation to the accuracy of these impression materials out of which various scientists concluded different results with most studies stating polyether with the maximum amount of dimensional accuracy in comparison to other materials. An accurate implant impression plays a significant role and serves as a starting point in the process of producing good working casts. Thus, the accuracy of impression techniques becomes a significant issue in consideration of passive fit. Reproduction of intraoral relationship of implants through impression procedures is the first step in achieving accurate fit prosthesis. This transference is still complicated by the number, angulation, depth, and position of implants. The advent of computer-aided design/computer-assisted manufacturing technology improved the framework fabrication procedures and has increased the precision of fit of implant prosthesis.

Impact of Advanced Manufacturing Technologies on Productivity of Indian Small & Medium Manufacturing Enterprises

2021 ◽  
Vol 08 (01) ◽  
pp. 23-32
Author(s):  
Divanshu Gupta ◽  
Keyword(s):  
Computer Aided Design ◽  
Manufacturing Industry ◽  
Advanced Manufacturing Technology ◽  
Advanced Manufacturing ◽  
Manufacturing Enterprises ◽  
Advanced Manufacturing Technologies ◽  
Manufacturing Organizations ◽  
Computer Aided ◽  
Manufacturing Technologies ◽  
Aided Design

Advanced Manufacturing Technology (AMT) is becoming a paronomasia in a scenario of today’s manufacturing striding towards Manufacturing 4.0 paradigm. While achieving such objectives, the initial impetus is to be given to reduce the waste arising out of motion and transportation using both hard and soft technologies by management. Right time delivery of product is also enhanced by these strategies, however the research is still lacking in such domains in local enterprises. To check the performance of various tools and strategies in manufacturing organizations, an investigative research was considered necessary using a two-step analysis viz. the organizational imperatives and the competency analysis of the tools deployed towards improvement of former. It was noted that Robotics and Computer-aided design/ computer-aided manufacturing are being fruitfully utilized in manufacturing industry of Punjab. The analysis deployed Reliability analysis including measuring of reliability coefficient, testing of mean difference using ANOVA, descriptive testing and student t-test for the analysis of filled questionnaires. From the investigation, it emerges out that clarity in goals of AMTs is essential for every employee in the organization.

Computer-aided alignment of castings and machining optimization

2014 ◽  
Vol 229 (3) ◽  
pp. 485-492 ◽  
Author(s):  
Andrzej Gessner ◽  
Roman Staniek ◽  
Tomasz Bartkowiak
Keyword(s):  
Machine Tool ◽  
Computer Aided Design ◽  
Reference Model ◽  
Accuracy Assessment ◽  
Assessment Method ◽  
Assessment Process ◽  
Shape Accuracy ◽  
Optical Scanner ◽  
Computer Aided ◽  
Machining Optimization

The presented publication demonstrates an accuracy assessment method for machine tool body casting utilizing an optical scanner and reference model of the machine tool body. The process allows assessing the casting shape accuracy, as well as determining whether the size of the allowances of all work surfaces is sufficient for appropriate machining, corresponding to the construction design. The described method enables dispensing with the arduous manual operation of marking out as well as shortening the time of aligning and fixing the casting body for machining. For the experimental setup, four rotary indexing table castings were investigated according to the method principles. The geometric accuracy of each casting was examined by comparing their scans with the computer-aided design model, and the machining allowances were evaluated to determine casting qualification for machining. The nominal volume of material to be removed was established and subsequently optimized to reduce the volume to be machined. Thus, a rapid method of aligning a casting in a machine tool according to the planned optimized distribution of machining allowances was developed. For the set of measured castings, it was proven that their poor geometric quality precluded the possibility of further machining according to standard marking out instructions. However, by following the presented methodology, it was possible to successfully process the entire set while reducing the overall volume of the material removed by 4.5–9.6%, as compared with nominal values. The obtained results ultimately confirmed that manual marking out could be eliminated from the casting assessment process.

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.

Dental materials

2020 ◽  
pp. 647-685
Keyword(s):  
Computer Aided Design ◽  
Dental Materials ◽  
Composite Resins ◽  
Dental Ceramics ◽  
Casting Alloys ◽  
Acrylic Resins ◽  
Impression Materials ◽  
Computer Aided ◽  
Materials Used ◽  
Aided Design

This chapter investigates the materials used in dentistry today. This includes the properties of dental materials, amalgam, and composite resins. Enamel and dentine bonding are discussed, along with dentine-adhesive systems, glass ionomers and composite-based products, and cements. Impression materials and techniques are considered, along with casting alloys, wrought alloys, dental ceramics, and computer-aided design (CAD) and computer-aided manufacture (CAM). The chapter concludes with a look at denture materials, from acrylic resins to rebasing, and the safety of dental materials.

Digital fabrication of removable partial dentures made of titanium alloy and zirconium silicate micro-ceramic using a combination of additive and subtractive manufacturing technologies

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yan Zhang ◽  
Kai Li ◽  
Hai Yu ◽  
Jiang Wu ◽  
Bo Gao
Keyword(s):  
Titanium Alloy ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Digital Fabrication ◽  
Content Type ◽  
Zirconium Silicate ◽  
Computer Aided ◽  
Subtractive Manufacturing ◽  
The Aesthetic ◽  
Manufacturing Technologies

Purpose This paper aims to present a new design for removable partial dentures (RPDs) for partially edentulous patients to improve the efficiency and quality of RPD manufacturing. Additive and subtractive manufacturing technologies and zirconium silicate micro-ceramic bonding in the aesthetic zone are used herein. Design/methodology/approach A case was presented. First, RPD digital definitive casts were acquired, and then digital frameworks with crown retainers and digital crowns were obtained by computer-aided design (CAD). The titanium alloy frameworks and resin crowns were fabricated by three-dimensional (3D) printing and computer-aided manufacturing (CAM) processes, respectively. The crowns adhered to the crown retainers. Ceramage bonding was used to reform the gingival anatomy in the aesthetic zone during the fabrication of the RPDs. The finished RPDs were assessed by a clinician and delivered to the patient. Findings The RPDs were conventionally assessed by a clinician, were deemed to be accurate and satisfied both the patient and clinician. Originality/value This novel method provides a way to fabricate RPDs with a combination of additive and subtractive manufacturing technologies. The design of the framework was different from that of a conventional framework because it contained the crown retainers, and the traditional base retainer no longer existed. Ceramage bonding was used to replicate the gingival anatomy in the aesthetic zone. The new RPDs provided accuracy and were less time-consuming to produce than those produced with the traditional method. The new method enables the digital manufacturing of nearly the entire RPDs.

Sign in / Sign up

Export Citation Format

Share Document