scholarly journals COMPARATIVE EVALUATION OF THE DIMENSIONAL ACCURACY OF BRIDGE PROSTHESIS FRAMES MADE USING TRADITIONAL AND DIGITAL

2021 ◽  
Vol 16 (4) ◽  
pp. 130-135
Author(s):  
Yuliya Vokulova ◽  
Evgenij Zhulev
Keyword(s):  
Digital Technologies ◽  
Dimensional Accuracy ◽  
Additive Technologies ◽  
3D Printer ◽  
Casting Method ◽  
Significance Level ◽  
Average Value ◽  
Median Distance ◽  
Higher Dimensional ◽  
Digital Methods

Subject. Modern digital technologies make it possible to automate the process of creating bridges to a large extent. First, digital images of the patient's dentition are obtained, then the future prosthesis is virtually modeled and manufactured using a subtractive method using milling and grinding machines or an additive method using a 3D printer. For clinical evaluation of the quality of orthopedic fixed structures made using digital methods, it is necessary to evaluate their dimensional accuracy. The aim is to conduct a comparative assessment of the dimensional accuracy of bridge prosthesis frames made using modern digital technologies and traditional casting method. Methodology. The intraoral laser scanner iTero Cadent, the 3D printer Asiga Max UV, the CAD/CAM system KaVo ARCTICA, the software DentalCAD 2.2 Valletta and the computer program MeshLab were used to study the dimensional accuracy of the bridge frames. The Kruskal-Wallis H-test and the Mann-Whitney U-test were used for statistical analysis of the data obtained. Results. All digital methods of manufacturing bridge frames are distinguishable from the traditional casting method with a significance level of p<0.05 on the basis of dimensional accuracy. The frames of bridge prostheses made by the subtractive method have a higher dimensional accuracy compared to the frames obtained using additive technologies. There were no statistical differences in the dimensional accuracy of milled titanium and zirconium bridge frames. Conclusions. Based on the data obtained, we concluded that the bridge frames made using modern digital technologies have a higher dimensional accuracy (the average value of the median distance of milled zirconium frames is 0,03067 ± 0,001234 mm, milled titanium frames are 0,03032 ± 0,002698 mm, frames made using additive technologies are 0,03686 ± 0,003068 mm) compared to the bridge frames made by the traditional casting method (the average value of the median distance 0,04342 ± 0,003722 mm), with a significance level of p<0,05 (U-Mann-Whitney criterion =0, p=,002).

Results of studying the dimensional accuracy of the bases of complete removable prostheses made using 3D printing and traditional technologies

2020 ◽  
pp. 34-39
Author(s):  
Vokulova Yu.A. Vokulova ◽  
E.N. Zhulev
Keyword(s):  
3D Printing ◽  
Traditional Method ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Digital Technologies ◽  
Dimensional Accuracy ◽  
3D Printer ◽  
Significance Level ◽  
Average Value ◽  
The Difference

This article presents the results of studying the dimensional accuracy of the bases of complete removable prostheses made using a 3D printer and the traditional method. Bases of complete removable prostheses were made using an intraoral laser scanner iTero Cadent (USA) and a 3D printer Asiga Max UV (Australia). To study the dimensional accuracy of the bases of complete removable prostheses, we used the DentalCAD 2.2 Valletta software. The Nonparametric Wilcoxon W-test was used for statistical analysis of the obtained data. We found that the average value of the difference with the standard for bases made using digital technologies is 0.08744±0.0484 mm. The average value of the difference with the standard for bases made by the traditional method is 0.5654±0.1611 mm. Based on these data, we concluded that the bases of complete removable prostheses made using modern digital technologies (intraoral laser scanning and 3D printer) have a higher dimensional accuracy compared to the bases of complete removable prostheses made using the traditional method with a significance level of p<0.05 (Wilcoxon's W-test=0, p=0.031). Keywords: digital technologies in dentistry, digital impressions, intraoral scanner, 3D printing, ExoCAD, complete removable dentures.

scholarly journals Study of the quality of the marginal gap of artificial crown frames made with the use of traditional and digital technologies

2020 ◽  
Vol 20 (1-2) ◽  
pp. 85-90
Author(s):  
Evgenii N. Zhulev ◽  
Yuliya A. Vokulova
Keyword(s):  
Laser Scanner ◽  
Dimensional Accuracy ◽  
Marginal Gap ◽  
Casting Method ◽  
Significance Level ◽  
Average Value ◽  
Cad Cam ◽  
Grinding Machine ◽  
Made In

The aim of the study is to evaluate the quality of the marginal gap of the frames of artificial crowns made with the use of CAD/CAM system and by casting method. Materials and methods. The article presents an assessment of the quality of the edge fitting of artificial crown frames made by means of CAD/CAM system KaVo ARCTICA on digital images of dentition created by intraoral laser scanner iTero Cadent and frames made of Co-Cr by the method of casting. The Image J computer program was used to study the quality of the marginal gap of artificial crown frames. For statistical analysis of the obtained data nonparametric Wilcoxon-Mann-Whitney test was used for the evaluation of the related samples. Results. We found that the average value of the marginal gap between the tooth stump of the experimental model and the frames of artificial crowns made in the KaVo ARCTICA Engine milling and grinding machine from the titanium blank Titan-Blank is 21.79 microns. The average value of the cement gap of the frames of artificial crowns made by the traditional casting method is 77.18 microns. The value of the marginal gap of artificial crown frames made by using the CAD/CAM system KaVo ARCTICA was 2.8 times less than the value of the marginal gap of frames made by the traditional casting method with a significance level of р 0.05 (V-Wilcoxon criterion for related samples = 0, р = 0.001). Conclusion. The results of our study indicate that the frames of artificial crowns made with the use of CAD/CAM system KaVo ARCTICA have a greater dimensional accuracy of the marginal gap compared to the frames of artificial crowns made by the traditional casting method.

Comparative assessment of the quality of the marginal fit of lithium disilicate crownworks made by traditional and digital technologies

2020 ◽  
pp. 4-9
Author(s):  
E.N. Zhulev ◽  
Yu.A. Vokulova
Keyword(s):  
Digital Technologies ◽  
Lithium Disilicate ◽  
3D Printer ◽  
Pressing Method ◽  
Marginal Fit ◽  
Significance Level ◽  
Average Value ◽  
Cad Cam ◽  
Made In

This article presents an assessment of the quality of edge adhesion of cages of artificial crowns from disilicate lithium: 1) obtained with the help of CAD/CAM system from material E. max CAD; 2) obtained with the help of Cad/CAM system from ashless polymeric material C-Cast; 3) was produced using a 3D printer from ashless UV photopolymer material; 4) made by the traditional method of pressing, without the use of digital technologies. The Image J computer program was used to study the quality of the edge gap of artificial crown frames. For statistical analysis of the obtained data, the nonparametric H-Kruskel-Wallis test and the W-Mann-Whitney test were used. We found that the average value of the edge gap between the stump of the experimental model and the frames of artificial crowns made in CAD/CAM ARCTICA from the E. max CAD material is 18.20±2.30 microns, from the polymer material C-Cast 22.50±1.37 microns. The average value of the edge gap between the stump of the tooth and the frames of artificial crowns made using the 3D printer Asiga Max UV is 22.35±1.59 microns. The average value of the edge gap between the tooth stump and the frames of artificial crowns made by traditional pressing method is 101.40±11.55 microns. The results of our study indicate that the frames of artificial crowns made of lithium disilicate made with the help of modern digital technologies have a smaller edge gap compared to the frames of artificial crowns made by the traditional pressing method with a significance level of p<0,05 (h-Kruskel-Wallis criterion=30,865 p=0,0000009).

Analysis of fitness of prosthetic bridge designed and produced with digital methods

2018 ◽  
Vol 68 (1) ◽  
pp. 32-44
Author(s):  
Daniel Surowiecki ◽  
Jan Wierzba ◽  
Roman Grygoruk ◽  
Kamila Wróbel-Bednarz
Keyword(s):  
Three Dimensional ◽  
Additive Technologies ◽  
Point Of View ◽  
Digital Design ◽  
Three Dimensional Objects ◽  
Average Value ◽  
Conventional Procedure ◽  
Abutment Teeth ◽  
Digital Methods

Introduction. In recent years the digitalization of dentistry has taken a special place in the world of scientific research. With the development of scanning methods and the improvement of software for the analysis and designing of three-dimensional objects, as well as the adaptation of milling techniques and additive technologies for dentistry applications in many clinical cases it is possible to replace the conventional procedure of prosthetic restoration with the digital process. It should be emphasized that the need of further thorough research is recommended especially on the accuracy of elements obtained with intraoral scanning and their production with additive technologies. Aim of the study. Analysis of marginal and internal fit of a prosthetic bridge designed and produced using digital methods. Material and methods. On the model of the jaw abutment teeth have been prepared to make a bridge. Using the intraoral scanner dental arches were scanned. The digital design was performed which was then printed using DMLS technology. The prosthetic restoration was 3D scanned in order to obtain a digital geometry which was processed with specialized software. The bridge fitting analysis to the CAD model of the abutment teeth was performed. Results. Heat map analysis allows to determine the high accuracy of bridge fitting within the abutment teeth. From 50 measurement points an average value of 0.0136 with a standard deviation of 0.0768 was obtained. The minimum value was -0.21, maximum 0.17. Discussion. As it results from the study and reports in the literature in many clinical situations it is possible to perform a completely digital procedure of producing prosthetic restorations. In vitro studies show the potential clinical usefulness of digital methods, however, most authors agree on the need of thorough clinical trials before fully recommending the application of completely digital procedures. The use of the developed methodology allows to perform further research on the accuracy of these technologies. Conclusions. The obtained results indicate the accuracy of producing prosthetic restoration with digital techniques. Application of these technologies allows to produce bridge characterized by high precision. The reverse engineering method can be used to numerically determine parameters which are relevant from the point of view of medical applications.

Comparative evaluation of the manufacturing time of arch prosthesis frames created using traditional and digital technologies

2021 ◽  
pp. 4-7
Author(s):  
Y.A. Vokulova
Keyword(s):  
Digital Technologies ◽  
Comparative Assessment ◽  
3D Printer ◽  
Orthopedic Treatment ◽  
Casting Method ◽  
Additive Manufacturing Technology ◽  
Casting Technology ◽  
Dental Technician ◽  
Traditional Technologies ◽  
Manufacturing Time

The aim of the study was to conduct a comparative assessment of the time spent by an orthopedic dentist and a dental technician for manufacturing the frames of arch prostheses obtained using digital and traditional technologies. The patients were divided into two groups. The first group consisted of 10 patients (4 men and 6 women), whose orthopedic treatment was performed with arch prostheses made according to the traditional method. Patients in the second group (7 men and 3 women) were treated using additive manufacturing technology. In total, 20 frames of arch prostheses were made, 10 in each group. The Mann-Whitney U-test was used for statistical analysis of the results obtained. Based on the data obtained, it was found that for the manufacture of an arc prosthesis frame using the Asiga Max UV 3D printer, an orthopedic dentist needs to spend 40.9±5.322 minutes, and a dental technician — 177.2±9.259 minutes. To make the frame of an arc prosthesis using traditional casting technology, the orthopedic dentist must spend 41.1±5.322 minutes, and the dental technician — 240.3±8.895 minutes. These data allowed us to conclude that the production of the arch prosthesis frame using modern digital technologies requires less total time and time spent by a dental technician in the laboratory, compared to the traditional casting method (p<0,0166667). No statistical differences were found between the time spent by the orthopedic dentist in the clinic when manufacturing the arch prosthesis frame using digital and traditional methods.

scholarly journals Study of the dimensional accuracy of jaw models obtained by 3d printing using stereolithography

2020 ◽  
Vol 27 (1) ◽  
pp. 40-48
Author(s):  
Evgeny N. Zhulev ◽  
Yuliya A. Vokulova
Keyword(s):  
Digital Images ◽  
Digital Technologies ◽  
Dimensional Accuracy ◽  
High Dimensional ◽  
Rank Test ◽  
3D Printer ◽  
Intraoral Scanner ◽  
Digital Impressions ◽  
Plaster Models ◽  
Wilcoxon Rank Test

Aim. To study the dimensional accuracy of dentition models produced by digital and conventional methods using an experimental model and digital technologies.Materials and methods. This article presents an assessment of the dimensional accuracy of jaw models created using an Asiga Max UV 3D printer from digital images of dentition created by an iTero Cadent intraoral scanner and plaster jaw models obtained from one-stage two-layer A-silicone impressions. The DentalCAD software and the Meshlab computer program were used to study the dimensional accuracy of the as-obtained digital images. The nonparametric Wilcoxon rank test was used for statistical analysis of the obtained data.Results. It is established that jaw models made of DETAX Freeprint model UV photopolymer using an Asiga Max UV 3D printer, based on digital impressions obtained by an iTero Cadent intraoral scanner, have a greater dimensional accuracy in comparison with plaster jaw models obtained from single-stage double-layer A-silicone impressions by 31.6% with a signifi cance level p < 0.05.Conclusion. Jaw models created using an Asiga Max UV 3D printer are characterized by high dimensional accuracy as compared to plaster models. 

POTRET PERILAKU RELIGIUS MAHASISWA UIN SAYARIF HIDAYATULLAH JAKARTA

Al-Risalah ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 126-148
Author(s):  
Ay Maryani
Keyword(s):  
Religious Behavior ◽  
Male And Female ◽  
Mean Values ◽  
Significance Level ◽  
Average Value ◽  
Environment Variable ◽  
Independent Variable ◽  
The Mean ◽  
Gender Factor ◽  
Level 2

This study describes the religious behavior of UIN Syarif Hidayatullah Jakarta students. The variables used are internal and external environment as independent variable and religious behavior as dependent variable. The internal environment variable consists of gender factor, (male and female). The external environmental variables comprise the faculty environment, the present resident and the place to grow. The present resident consist of dormitories, boarding houses and parents' homes and the place to grow consist of urban and rural environment. Religious behavior variables consist of habluminallah behavior and habluminannas behavior. Habluminallah's behavior measured by (1) knowledge of faith and worship, (2) attitudes toward faith and worship, and (3) practice of faith and worship. The habluminannas variable measured by (1) Islamic behavior for them self, like honest, discipline and good work / studyethics, trust and concern on legality, (2) Islamic behavior with others, like generous, cooperation, caring, respect to the people's rights and tolerance and (3) Islamic behavior for the natural surroundings, like love of nature and nature conservation efforts. The methodology used was (1) Statistical descriptive, (2) MANOVA (Multivariate Analysis of Variance) and (3) Independent sample t-test. The results showed the religious behavior UIN Syarif Hidayatullah Jakarta students has a very good category. This is indicated by the mean values for the behavior of haluminallah and habluminannas of 158.85 and 178.76,  espectively. The average value of habluminallah behaviour in the range of values "145-180" with the category of "very good" and habluminannas behavior in the range value "165-205" with the category "very good. Habluminallah and habluminannas behavior are different for each faculty. This is indicated by the significance level of Pillai Trace, Wilk Lambda, Hotelling Trace, Roy's Largest Root of 0.00 (<0.05). Habluminallah and habluminannas behavior are the same for respondents who live in dormitories, boarding houses, and parents' homes. This is indicated by the value of F test and significance at Wilk's Lambda respectively for 2.055 and 0.085 (>0.05). Habluminallah and habluminannas behaviors are similar for urban and rural respondents. This is known from the sig level. (2-tailed) for habluminallah and habluminannas behavior of 0.317 and 0.245 (> 0.05), respectively. Habluminallah and habluminannas behaviors are similar for male and female. This is known from the sig level. (2-tailed) for habluminallah and habluminannas behavior of 0.950 and 0.307 (> 0.05),respectively. The results of this study are expected to be used to develop university policies that can enhance the Islamic values of UIN Syarif Hidayatullah Jakarta.

The Use of Digital Clinical Trial Methods in the Evaluation of Digital Therapeutics: A Scoping Review (Preprint)

2019 ◽  
Author(s):  
Allison Hirsch ◽  
Mahip Grewal ◽  
Anthony James Martorell ◽  
Brian Michael Iacoviello
Keyword(s):  
Clinical Trial ◽  
Clinical Trials ◽  
Clinical Research ◽  
Scoping Review ◽  
Digital Technologies ◽  
Good Clinical Practice ◽  
The United States ◽  
Clinical Trial Research ◽  
Digital Methods ◽  
Clinical Trial Methods

BACKGROUND Digital Therapeutics (DTx) provide evidence based therapeutic health interventions that have been clinically validated to deliver therapeutic outcomes, such that the software is the treatment. Digital methodologies are increasingly adopted to conduct clinical trials due to advantages they provide including increases in efficiency and decreases in trial costs. Digital therapeutics are digital by design and can leverage the potential of digital and remote clinical trial methods. OBJECTIVE The principal purpose of this scoping review is to review the literature to determine whether digital technologies are being used in DTx clinical research, which type are being used and whether publications are noting any advantages to their use. As DTx development is an emerging field there are likely gaps in the knowledge base regarding DTx and clinical trials, and the purpose of this review is to illuminate those gaps. A secondary purpose is to consider questions which emerged during the review process including whether fully remote digital clinical research is appropriate for all health conditions and whether digital clinical trial methods are inline with the principles of Good Clinical Practice. METHODS 1,326 records were identified by searching research databases and 1,227 reviewed at the full-article level in order to determine if they were appropriate for inclusion. Confirmation of clinical trial status, use of digital clinical research methods and digital therapeutic status as well as inclusion and exclusion criteria were applied in order to determine relevant articles. Digital methods employed in DTx research were extracted from each article and these data were synthesized in order to determine which digital methods are currently used in clinical trial research. RESULTS After applying our criteria for scoping review inclusion, 11 articles were identified. All articles used at least one form of digital clinical research methodology enabling an element of remote research. The most commonly used digital methods are those related to recruitment, enrollment and the assessment of outcomes. A small number of articles reported using other methods such as online compensation (n = 3), or digital reminders for participants (n = 5). The majority of digital therapeutics clinical research using digital methods is conducted in the United States and increasing number of articles using digital methods are published each year. CONCLUSIONS Digital methods are used in clinical trial research evaluating DTx, though not frequently as evidenced by the low proportion of articles included in this review. Fully remote clinical trial research is not yet the standard, more frequently authors are using partially remote methods. Additionally, there is tremendous variability in the level of detail describing digital methods within the literature. As digital technologies continue to advance and the clinical research DTx literature matures, digital methods which facilitate remote research may be used more frequently.

Characteristics of Rotary Draw-Bent Tubes for the Hydroforming

2011 ◽  
Vol 213 ◽  
pp. 320-324
Author(s):  
Byeong Don Joo ◽  
Jeong Hwan Jang ◽  
Hyun Jong Lee ◽  
Young Hoon Moon
Keyword(s):  
Cross Section ◽  
Structural Strength ◽  
Dimensional Accuracy ◽  
Thickness Variation ◽  
Important Process ◽  
Rotary Draw Bending ◽  
Higher Dimensional ◽  
Bending Process ◽  
Geometric Size ◽  
Draw Bending

Hydroformed parts have higher dimensional accuracy, structural strength, and dimensional repeatability. The pre-bending process is an important process for the successful hydroforming in the case where the perimeter of the blank is nearly the same as that of final product. At initial pre-bending stage, the variations of wall thickness and cross-section have effects on the accuracy of final products and quality. Because of a relatively excellent productive velocity, geometric size precision and reliance of product qualities, rotary draw bending is widely used. This study shows the bendability such as cross-section ovality, springback ratio and thickness variation in the various conditions of materials.

PENGARUH KELAS IBU HAMIL TERHADAP PENGETAHUAN DAN SIKAP IBU TENTANG PEMERIKSAAN DAN PERAWATAN KEHAMILAN DI WILAYAH KERJA PUSKESMAS BATAM TAHUN 2016

2016 ◽  
Vol 1 (2) ◽  
pp. 61-70
Author(s):  
R.Oktaviance Simorangkir ◽  
Lilis Sumardiani
Keyword(s):  
Pregnant Women ◽  
Health Workers ◽  
Community Health Center ◽  
Average Score ◽  
Maternal Knowledge ◽  
Class Effect ◽  
Cross Sectional ◽  
Significance Level ◽  
Average Value ◽  
Total Range

In the Working Area of Pancur Batu Puskesmas class, pregnant women begin to be implemented in 2016, but still found the low knowledge of pregnant women about the ideal pregnancy examination and there are pregnant women who show unimportant attitude checking pregnancy to health workers. Goals : The purpose of this research is to know the influence of maternal class on pregnant mother's knowledge and attitude about pregnancy examination and treatment. Methods : The study used a quantitative method with cross sectional design. The population of 151 pregnant women in Pancur Batu Community Health Center and 132 of them (63 pregnant women who had attended pregnant mother class and 69 pregnant women who never attended maternal class) were used as samples. Data analysis using independent t test at significance level α = 0,05. Result : The results showed the total range of knowledge scores of mothers who had followed the class of pregnant women is 7-13 with an average value of 10.08 ± 1.82, while the total range of scores of mothers who never follow the pregnant women's class is 1-9 with an average value 4,97,1,94. There is a maternal class effect on maternal knowledge of examination and treatment of pregnancy (p <3,82. There is a maternal class effect on maternal attitudes about examination and treatment of pregnancy (p3.13, while the total range of maternal scores that never follow the class of pregnant women is 27-47 with an average value of 35 , 410.001). The total score of attitudes of mothers who have attended the class of pregnant women is 41-56 with an average score of 48.24 <0.001). Conclution : It is expected that the Health Office to schedule Pancur Batu Puskesmas to carry out pregnant women's classes regularly and carried out 2 periods a year. Pancur Batu Puskesmas is expected to maintain the quality of pregnant women's classes and counseling invites all pregnant women to follow the class of pregnant women.

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