COMPARATIVE CHARACTERISTICS OF TRANSFERS SPLINTING TECHNIQUES IN THE PROCESS OF TAKING ONE-STAGE DOUBLE-LAYERED DENTAL IMPRESSIONS BY MEANS OF OPEN TRAY IMPRESSION TECHNIQUE

2020 ◽  
pp. 65-64
Author(s):  
B. L. Pelekhan ◽  
М. М. Rozhko ◽  
L. І. Pelekhan
Keyword(s):  
Alveolar Ridge ◽  
Impression Material ◽  
Dental Floss ◽  
Impression Technique ◽  
Custom Made ◽  
Key Factor ◽  
Dental Impression ◽  
The Cost ◽  
Clinical Cases

Abstract. According to conclusions of ITI World Congress (2018), the accuracy of the dental impression determines the quality of the working model and, consequently, the fixation of the prosthetic restorations at the final stage. Inaccurate dental impression will inevitably lead to technical and biological complications (Wolfart S., 2016). According to Lee and co-authors (2019), the accuracy of the dental impression is influenced by the chosen method, namely closed or open tray, the presence or absence of transfers splinting and the choice of impression material type. The most accurate impression has been proved to be an impression taken with the use of an open tray impression technique, by means of polyether impression material with preliminary transfers splinting using internally interfaced implant system. The objective of the research was to evaluate the quality of implants placement transferring to the model by comparative analysis of different methods of clinical transfers splinting in order to take impressions using an open tray impression technique. Twelve clinical situations were studied. Four groups were formed according to the method of transfer splinting. Each group included 3 clinical cases. Impressions were taken with the use of an open tray impression technique in all clinical cases with preliminary custom-made trays with holes in the implants projections. A grading scale was created when assessing the quality of transfer splinting as a key factor in the accuracy of implant placement transferring. Each of the groups received from 1 to 4 points where 1 point was the worst result according to this criterion and 4 points meant the best one. Among the criteria for splinting quality evaluation, 1-3 criteria were considered to be subjective, criterion 4 was considered to be objective. Therefore, criterion 4 received coefficient ×2 in order to increase the objectivity of the results evaluation. There were 4 criteria: The simplicity of the technique and the time spent splinting. The cost of the technique. Passivity when fixing the bridge prosthetic restoration after manufacturing. Radiologically measured distance between the centers of implant analogues on the model relative to each other after an impression taking by means of different splinting techniques and deviation of the value from the position of the centers of implants heads tops after osseointegration according to CT scan. Analyzing the results of the research, splinting techniques were ranked according to the obtained points. Research group 1 scored 6 points using dental floss and flowable compomer. A considerable amount of time was spent splinting with relatively inexpensive technology. The passivity of the fixation was the worst in comparison with other methods and the largest error was determined radiographically. Group 4 scoring 17 points was determined as the best of the chosen techniques. Despite the high cost of the chosen technique, prosthetic restorations made after transfers splinting by means of this technique had the highest fixation accuracy and the lowest deviation of the implants analogues on the model radiographically in comparison with the position of the implants in the upper alveolar ridge and lower alveolar ridge due to the cost of the material based on poly-vinyl siloxane.

scholarly journals 3D Digital Impression Systems Compared with Traditional Techniques in Dentistry: A Recent Data Systematic Review

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1982 ◽  
Author(s):  
Marco Cicciù ◽  
Luca Fiorillo ◽  
Cesare D’Amico ◽  
Dario Gambino ◽  
Emanuele Mario Amantia ◽  
...  
Keyword(s):  
New Technologies ◽  
Digital Impression ◽  
New Device ◽  
Advantages And Disadvantages ◽  
Impression Technique ◽  
Impression Materials ◽  
Key Factor ◽  
Dental Impression ◽  
Digital Or

The advent of new technologies in the field of medicine and dentistry is giving improvements that lead the clinicians to have materials and procedures able to improve patients’ quality of life. In dentistry, the last digital techniques offer a fully digital computerized workflow that does not include the standard multiple traditional phases. The purpose of this study is to evaluate all clinical trials and clinical randomized trials related to the digital or dental impression technique in prosthetic dentistry trying to give the readers global information about advantages and disadvantages of each procedure. Data collection was conducted in the main scientific search engines, including articles from the last 10 years, in order to obtain results that do not concern obsolete impression techniques. Elsevier, Pubmed and Embase have been screened as sources for performing the research. The results data demonstrated how the working time appears to be improved with digital workflow, but without a significant result (P = 0.72596). The papers have been selected following the Population Intervention Comparison Outcome (PICO) question, which is related to the progress on dental impression materials and technique. The comparison between dentists or practitioners with respect to classic impression procedures, and students open to new device and digital techniques seem to be the key factor on the final impression technique choice. Surely, digital techniques will end up supplanting the analogical ones altogether, improving the quality of oral rehabilitations, the economics of dental practice and also the perception by our patients.

A Clinical Report on the Use of Closed-Tray, Hex-Lock-Friction-Fit Implant Impression Copings

2014 ◽  
Vol 40 (4) ◽  
pp. 449-453
Author(s):  
Eli Raviv ◽  
Jan Hanna ◽  
Roy Raviv ◽  
Mili Harel-Raviv
Keyword(s):  
Relevant Literature ◽  
Clinical Report ◽  
Impression Material ◽  
Impression Technique ◽  
Implant Dentistry ◽  
Clinical Cases

The precision of an impression determines the subsequent accuracy and fit of the final restoration. Therefore, the ultimate search is for the most accurate impression material and the most efficient and least time consuming technique. One of the major debates in implant dentistry has focused on the advantages of the pick-up versus the transfer impression technique. The pick-up technique is widely accepted as the more accurate. However, the conventional transfer technique is simpler and less time consuming. The Hex-Lock-Friction-Fit impression coping (AB Dental Devices) combines the advantages of the transfer impression technique and the pick-up impression technique. In this article we will review the relevant literature, discuss the advantages of this unique implant impression technique, and present some related clinical cases.

scholarly journals Decision Making with Dynamic Uncertain Events

2015 ◽  
Vol 54 ◽  
pp. 233-275 ◽  
Author(s):  
Meir Kalech ◽  
Shulamit Reches
Keyword(s):  
Decision Making ◽  
Approximation Algorithms ◽  
Optimal Algorithm ◽  
The Other ◽  
Uncertain Information ◽  
Effective Algorithm ◽  
Key Factor ◽  
The One ◽  
The Cost

When to make a decision is a key question in decision making problems characterized by uncertainty. In this paper we deal with decision making in environments where information arrives dynamically. We address the tradeoff between waiting and stopping strategies. On the one hand, waiting to obtain more information reduces uncertainty, but it comes with a cost. Stopping and making a decision based on an expected utility reduces the cost of waiting, but the decision is based on uncertain information. We propose an optimal algorithm and two approximation algorithms. We prove that one approximation is optimistic - waits at least as long as the optimal algorithm, while the other is pessimistic - stops not later than the optimal algorithm. We evaluate our algorithms theoretically and empirically and show that the quality of the decision in both approximations is near-optimal and much faster than the optimal algorithm. Also, we can conclude from the experiments that the cost function is a key factor to chose the most effective algorithm.

scholarly journals Comparison of double-phase impression technique in 1 step and 2 steps by evaluating dimensional stability and accuracy of condensation silicones

2018 ◽  
Vol 63 (01) ◽  
pp. 55-61
Author(s):  
Borjan Naumovski ◽  
Jadranka Bundevska ◽  
Biljana Kapusevska
Keyword(s):  
Dimensional Stability ◽  
Impression Material ◽  
Impression Technique ◽  
Impression Materials ◽  
Double Phase ◽  
Dental Impression ◽  
Master Model ◽  
Stability And Accuracy ◽  
Plaster Model ◽  
Selection Of

The diverse viscosities of silicone impression materials are suited for their use in various impression techniques, intended to improve the precision of the cast impression in the form of a plaster model. The purpose of this research is to determine the dimensional stability and accuracy of the double-phase impression technique in 1 step and 2 steps by using a condensation silicone impression material. This research was carried out by using a precise stainless-steel master model and an individual aluminum tray. Comparing the abutments of the master model and the abutments of the double-phase impression technique in 2 steps, showed that they are wider on average 81 µm, while the abutments from the double-phase impression technique in 1 step are on average 281 µm wider in diameter. After analyzing the results obtained in relation to the diameter of the abutments, it can be concluded that the double-phase impression technique in 2 steps is dimensionally more stable and accurate compared to the double-phase impression technique in 1 step. This study shows that dimensional stability and accuracy of impression materials also depend on the selection of appropriate impression technique and proper performance in order to obtain a high quality dental impression that will be the basis for an accurate fixed-prosthodontic fabrication. Keywords: silicone impression material, impression technique, fixed partial dentures, dimensional stability and accuracy

Making an open-tray implant or abutment-level impression technique easier

Dental Update ◽  
2021 ◽  
Vol 48 (7) ◽  
pp. 592-593
Author(s):  
Javed Ikram ◽  
Nabeel Essa
Keyword(s):  
Impression Material ◽  
Impression Technique ◽  
Adhesive Quality ◽  
Good Contact ◽  
Conventional Methods ◽  
Made In

Various methods exist for taking implant impressions. The open-tray or pick-up impression technique is one of the conventional methods for transferring the impression coping from the implant to the impression. In this method, a window directly above the implant is made in a stock or custom tray to allow access to the impression coping. Traditionally, the window is either left open, or closed with melted wax or foil. This technique tip describes a modification to create a stable and secure seal over the opening using rayon-based adhesive tapes. The benefits of this modification over the conventional open-tray technique are due to the enhanced adhesive quality of the materials to metal or plastic. Because there is less chance of impression material leaking from the tray window into the mouth, it is more comfortable for patients and less messy for clinicians. The benefit of this method over the closed-tray technique is the ability to feel for the head of the impression coping at the same time as making sure the impression material is in good contact with the underlying structures. It is easy to use, and efficient in terms of time and cost.

DIMINISHING CAPACITY REQUIREMENT FOR MOBILITY DATABASE IN WIRELESS ATM

2004 ◽  
Vol 13 (02) ◽  
pp. 271-291
Author(s):  
KUEN-LIANG SUE ◽  
CHI-CHUN LO
Keyword(s):  
Discrete Event ◽  
Wireless Atm ◽  
Event Simulation ◽  
Location Register ◽  
Mobility Database ◽  
Visitor Location Register ◽  
Key Factor ◽  
The Cost ◽  
Second Chance

In wireless ATM, Visitor Location Register (VLR) is the database that supports mobility management. In case the number of roaming users exceeds the VLR supports, the arriving users cannot receive any service. To solve the problem, the Random Replacement (RR) policy randomly selects a victim record in VLR to be replaced with the record of the arriving user. The quality of services for the victim user will certainly drop. Therefore, the proportion of affected users is not allowed to exceed a tolerable threshold. Apparently, VLR size is the key factor of the threshold. The cost for maintaining a VLR increases significantly as its size grows. So, how to utilize the capacity efficiently is an important issue in VLR planning. We propose a Second Chance Replacement (SCR) policy to reduce the requirements for VLR capacity. As compared with the RR policy, the discrete-event simulation results show that the SCR policy can save 2.5% to 28% VLR size under various QoS thresholds.

scholarly journals Factors Affecting Cost Overrun in Construction Projects

2019 ◽  
Vol 9 (2) ◽  
pp. 4831-4833
Keyword(s):  
Construction Projects ◽  
Basic Problem ◽  
Cost Overrun ◽  
Quality Cost ◽  
Factors Affecting ◽  
Critical Elements ◽  
Key Factor ◽  
The Common ◽  
The Cost

Cost overrun is observed as one of the common and basic problem which took place in different construction projects and affects its progress. Construction cost can be considered as the key factor to tell whether a project is successful or not. The cost of any project may be within, under or overrun. Among these cost overrun affects the project progress directly. Since it affects profit of the contractor, financial problems, delay in completion time, compromise on the material quality. Cost overrun can push the particular company to bankruptcy. Therefore various factors influencing the cost overrun must be thoroughly analyzed in order to reduce the cost overrun in such projects without compromising the quality of the project. The need of this research is to recognize the critical elements that lead to cost overrun in such projects.

scholarly journals Organizational and managerial problems of conservation, growth and improving the quality of the national scientific potential

2018 ◽  
Vol 6 (1-2) ◽  
pp. 5-17
Author(s):  
O. Y. Bobrovska
Keyword(s):  
General Structure ◽  
The State ◽  
Key Factor ◽  
Scientific Potential ◽  
Scientific Results ◽  
Main Components ◽  
Scientific System ◽  
The Cost ◽  
Training Of Personnel

A theoretical and analytical study of the national science development as a key factor in the development of society is done. The data published in articles devoted to science and action is shown. The analysis of the principles of supporting the development of science by the authorities is given; their systematic non-fulfillment, which leads to deteriorating conditions for the establishing sustainable potential movement and growth of the pace of development of science, is proved. The dynamic indicators of number of people, involved in science, the cost of the state to the scientific branch and other indicators of state statistical reporting of scientific results. Their insufficiency was noted for obtaining a consensus on the state of science and a proposal was made to expand their composition.The subject-objects of the scientific space of the country and documents reflecting the vision of the strategic course of the development of science, directions, stages and components, etc. are analyzed. Their inadequate organizational, institutional and substantive substantiation, late timing of development and observance is proved.The scheme of the through process of training of personnel potential of science is presented. A key factor in the development of the scientific system is the concept and the strategy for development of science. Their development, according to the author, should be carried out through using models of institutional, organizational, managerial, and structural-process approaches. Their development and implementation will create conditions for the establishing of close vertical and horizontal cooperation and integration of efforts and resources of the authorities and subjects of the scientific sphere to increase the efficiency of the activities in the system of science and whole competitiveness of the country. The general structure of the main components of the alternative project of the national strategy for the development of Ukrainian science is proposed.Future scientific developments in this direction should be the study of mechanisms of multisubjective interaction and cooperation between authorities, subjects and participants of scientific activities in the internal sphere of science and the environment on the basis of cooperation agreements and also taking into account the interests of all subjects of the scientific potential and their resource opportunities.

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