scholarly journals Preparation Junctions for All-Ceramic CAD/CAM Crown and Bridge Restorations

2016 ◽  
Vol 20 (2) ◽  
pp. 122-125
Author(s):  
Angelina Vlahova
Keyword(s):  
Dental Tissues ◽  
Fixed Prosthodontics ◽  
Number Of Factors ◽  
All Ceramic ◽  
Cad Cam ◽  
Junction Type ◽  
Dark Color ◽  
Cam Software ◽  
Criteria For Selection ◽  
Selection Of

Summary Background: The preparation junction type is determined by a number of factors that need to be taken in consideration with CAD/CAM Fixed Prosthodontics: the used material; the condition of the retainer teeth, their periodontium and the occlusion; the design software and the type of drills; the working protocol; the cement and the method of cementation.The aim: of this article is to describe the optimal preparation junctions for CAD/CAM crown and bridge restorations made by ceramics based on zirconium dioxide and the basic factors that affect them.Materials and methods: Chamfer and radial shoulder preparation junctions are suitable (width 1 - 1, 5 mm). Trimming of 1, 5-2 mm dental tissues is necessary on the occlusal surface. The homothetic tooth reduction is optimal. The surface has to be smooth and the edges rounded.Results: The preparation width depends on the size and vitality of the tooth. In stained teeth the removal of more tissues provides a greater volume needed for masking the dark color. Vestibular preparation under the level of the gingiva is preferable to ensure optimal aesthetics. The preparation junction is determined also by the CAD/CAM software abilities, the type of drills and protocol of impression taking (classical or digital). The creation of a working model with an intraoral scanner is greatly facilitated by preparations above the gingival margin. Conclusions: Knowledge about the criteria for selection of preparation junctions is essential for fabrication of accurate and aesthetic CAD/CAM restorations.

OPTIMAL PREPARATION JUNCTIONS FOR ALL-CERAMIC FIXED RESTORATIONS MADE BY CAM 5 – S 2 IMPRESSION, VHF

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Angelina Vlahova ◽  
Viktor Hadzhigaev ◽  
Christo Kissov ◽  
Rada Kazakova ◽  
Tanya Bozhkova
Keyword(s):  
Intraoral Scanner ◽  
Dental Tissues ◽  
Fixed Prosthodontics ◽  
Number Of Factors ◽  
All Ceramic ◽  
Cad Cam ◽  
Dark Color ◽  
Design Software ◽  
Ceramic Crown ◽  
Criteria For Selection

Introduction: The type of the preparation junction is determined by a number of factors that need to be taken in consideration with CAD/CAM Fixed Prosthodontics: the material of which the construction will be made; the type and condition of the retainer teeth, of their periodontium and the occlusion; the design software, the CAM setting and the type of drills; the working protocol; the type of the cement and the method of cementation.Purpose: The aim of this publication is to describe the optimal preparation junctions for all-ceramic crown and bridge restorations made by CAM 5 - S 2 Impression, VHF.Materials and methods: Suitable are chamfer and shoulder preparation junction with rounded inner angle (width 1 - 1, 5 mm). Trimming of 1.5 – 2 mm dental tissues is necessary on the occlusal surface. The homothetic reduction of teeth is optimal.Results and discussion: The width depends on the size and vitality of the tooth. In stained teeth and those built with metal pins the removal of more tissues provides a greater volume needed to disguise the dark color. Vestibular preparation under the level of the gingiva is preferable to ensure optimal aesthetics. Preparation junction is determined also by the CAD/CAM technology - the type of drills and protocol of impression taking (classical or digital). The creation of a working model with TRIOS, 3Shape intraoral scanner is greatly facilitated by preparation junctions made above the gingival margin.Conclusion: Knowledge about the criteria for selection the preparation junctions is essential for fabrication accurate and aesthetic CAD/CAM restorations.

scholarly journals SELECTION OF OPTIMAL MACHINING STRATEGY IN THE MANUFACTURE OF ELEMENTS BOUNDED BY CURVILINEAR SURFACES

2013 ◽  
Vol 7 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Łukasz Czerech
Keyword(s):  
Cnc Machine Tools ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Technological Parameters ◽  
Machining Strategy ◽  
Cad Cam ◽  
The Impact ◽  
Cam Software ◽  
Selection Of

Abstract Increasing machining accuracy realized on CNC machine tools causes that the more frequently surfaces machined with this technique are not subject to further finishing processing and directly affects on the final quality of the product. Achieving geometric accuracy established by the constructor is the problem that modern technologists and CAD/CAM programmers have to faced with. The paper presents the influence of toolpath tolerance and machining strategy available in CAD/CAM software on the constituting process of technological surface layer for elements limited with curvilinear surfaces. The impact of the above mentioned parameters on the location and direction of geometrical deviations were also analyzed. Following article is part of research of the impact of selected technological parameters on the freeform surfaces geometric structure manufactured on CNC machines

Research on Chamfer Software of Complex Parts

2013 ◽  
Vol 631-632 ◽  
pp. 1335-1341
Author(s):  
Shi Yong ◽  
Wen Tao Liu
Keyword(s):  
3D Model ◽  
Tool Path ◽  
Machining Parameters ◽  
Cad Cam ◽  
Programming Software ◽  
A Chain ◽  
Definition Of ◽  
Complex Parts ◽  
Cam Software ◽  
Location Point

In order to meet the needs of enterprises for chamfering complex parts, based on the customization of commercial CAD/CAM software, chamfer programming software is developed. According to user’s machining demands for a part, a chain of edges of a part is extracted from its 3D model. With preprocessing of the chain of edges, the continuity of the chain is estimated, and the start and end point of those edges are automatic obtained. Furthermore, with human-machine dialogue, machining parameters is set by users. By definition of the primary and secondary surfaces of the chain of edges, and interpolation of the edges, the positions of cutter location point and postures of cutter are calculated. Finally the interference of tool path is checked, and tool path is simulated. The software solves the programming problem of chamfering complex parts.

Virtual Reality Interface Using PDA for Street View Color Design

2005 ◽  
Vol 277-279 ◽  
pp. 318-323
Author(s):  
Yang Hee Nam
Keyword(s):  
Virtual Reality ◽  
Architectural Design ◽  
Virtual Reality Technology ◽  
Design Problems ◽  
Color Design ◽  
3D Space ◽  
Street View ◽  
Cad Cam ◽  
Realistic View ◽  
Cam Software

Architectural design is one of those areas that have actively employed interactive design tools such as CAD/CAM software. In order to add a realistic view of the design results in the 3D work process, there have been several recent attempts to employ a virtual reality technology that allows architects to explore design in 3D space. However, VR’s weakness is that common interaction tasks, such as navigation and selection, are still not supported conveniently in 3D space. In addition, VR devices are generally unfamiliar to the average person and are too expensive to use. This paper presents a VR framework that makes the design task easily achieved by employing a PDA interface for a VR interaction applied to street-view emotional color design problems.

ADDITIONAL CRITERIA FOR SELECTION OF MALTING QUALITY IN BARLEY BREEDING

1976 ◽  
Vol 56 (4) ◽  
pp. 805-809 ◽  
Author(s):  
V. M. BENDELOW
Keyword(s):  
Specific Gravity ◽  
Filtration Rate ◽  
Sugar Content ◽  
Reducing Sugar ◽  
Malting Quality ◽  
Breeding Programs ◽  
Barley Breeding ◽  
Sample Extraction ◽  
Criteria For Selection ◽  
Selection Of

A procedure that provides information on the suitability of barley for malting and, brewing purposes is described. Three parameters are measured: mash filtration rate, wort viscosity and wort-reducing sugar content, as maltose. Maltose is determined by an auto-analyzer method and this is a satisfactory alternative to the specific gravity procedure for the estimation of percent extract. The addition of these criteria to those already in use enables more discriminatory selection at early generations of barley-breeding programs. The technique requires only one sample extraction and 18 g of laboratory malt.

CRITERIA FOR SELECTION OF PREPARATIONS IN THE DEVELOPMENT OF SORPTION-DETOXIFYING COMPLEXES FOR AGRICULTURAL ANIMALS

2018 ◽  
Vol 1 (2) ◽  
pp. 94-100
Author(s):  
L.L. Zakharova ◽  
◽  
G.A. Zhorov ◽  
V.I. Dorozhkin ◽  
◽  
...  
Keyword(s):  
Chemical Nature ◽  
Negative Impact ◽  
Physiological State ◽  
Animal Husbandry ◽  
Biologically Active ◽  
Combined Pollution ◽  
Wide Range ◽  
Active Substances ◽  
Criteria For Selection ◽  
Selection Of

Negative impact on the environment as a result of economic activity of man increasingly becomes the character of combined pollution of ecotoxicants, including xenobiotics of radiation and chemical nature. In animal husbandry in ecologically unfavorable regions, sorbtion-detoxication technologies based on the complex application of bioprotective substances of different origin are used to reduce the intake and accumulation of xenobiotics, to normalize the physiological state of animals and to obtain safe products. It is necessary to observe certain principles ensuring compatibility of components, a wide range of bioprotective action, efficiency and safety at their use in developing the compositions of such sorption-detoxifying complexes. The article substantiates the criteria that should be followed in creating sorption-detoxifying complexes and presents groups of drugs with different mechanisms of action (sorbents, antioxidants, immunomodulators, adaptogens and other biologically active substances) for inclusion in the formulations of combined compositions.

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