scholarly journals Comparison of the Mechanical Properties of Temporary Abutments Made of Polyetheretherketone and Photopolymeric Resin

2021 ◽  
Vol 15 (1) ◽  
pp. 512-519
Author(s):  
Maria -Alejandra Barragán-Paredes ◽  
Isabella Mosquera-Victoria ◽  
Carlos Alberto Viveros-Rebolledo ◽  
Martha Lucia Rodríguez-Paz ◽  
Mario Fernando Muñoz-Velez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Statistical Analysis ◽  
3D Printing ◽  
Dental Implants ◽  
Null Hypothesis ◽  
Whitney Test ◽  
Mann Whitney Test ◽  
Additive Technique

Background: Provisional abutments are widely used in the rehabilitation of dental implants as it allows the use of a provisional crown in order to restore patient aesthetics while the final restoration is being carried out; most of the temporary abutments available on the market are made of titanium alloygrade V (type Ti-6Al-4Va) and polyetheretherketone (PEEK), a material that exhibits very low adhesion to polymethylmethacrylate (PMMA). Objective: This research is aimed to compare the mechanical properties of commercially available PEEK abutments and abutments made using an additive technique with photopolymeric resin. Methods: Eighteen commercial temporary abutments manufactured in PEEK and eighteen experimental abutments manufactured by 3D printing using photopolymeric resin were used. The two groups of abutments were subjected to compression, bending and adhesion tests using six abutments of each type by test. Statistical analysis was performed with STATA 14 software. The data were analyzed by means of the Wilcoxon Mann-Whitney test, as these were two independent samples of reduced size. Values ​​lower than (p <0.05) were considered statistically significant in all tests and rejected the null hypothesis of equality between the group medians. Conclusion: The results indicate that it is possible to make abutments with good mechanical properties in photopolymeric resin (CLEAR FLGP04) using additive techniques to be used as temporary abutments.

scholarly journals The differences of caries prevalence and caries index of children in primary school with UKGS and without UKGS in Kota Batam

2009 ◽  
Vol 21 (1) ◽  
Author(s):  
Ratna Ayu Alia Zulkarnain ◽  
Eriska Riyanti ◽  
Inne Suherna Sasmita
Keyword(s):  
Statistical Analysis ◽  
Primary School ◽  
Caries Prevalence ◽  
Chi Square ◽  
Whitney Test ◽  
Mann Whitney Test ◽  
Chi Square Test

The purposes of this research were to describe the caries prevalence and caries index of children in primary school with UKGS (SD Kartini I) and without UKGS (SD 009 Bulang) in Kota Batam. Total samples of this research were 193 persons, it is consist of 107 persons from SD Kartini I and 86 persons from SD 009 Bulang. The Chi-Square Test and U Mann-Whitney Test were conducted in this research. The statistical analysis was significant for caries prevalence between children in primary school with UKGS and without UKGS with χ2table = 2.71 and χ2calculate = 3.73, whereas def-t index between children in primary school with UKGS and without UKGS was significant with - Ztable = - 1.96 and Zcalculate = - 2.91 with α = 0.05. The DMF-T index between children in primary school with UKGS and without UKGS was significant with Ztable = 1.96 and Zcalculate = 6.32 with α = 0,05. The conclusions of this study indicate that there were differences of caries prevalence and caries index between children in primary school with UKGS and without UKGS.

Mechanical properties and osteoblast proliferation of complex porous dental implants filled with magnesium alloy based on 3D printing

2020 ◽  
pp. 088532822095790
Author(s):  
Xuetao Zhang ◽  
Jian Mao ◽  
Yufeng Zhou ◽  
Fangqiu Ji ◽  
Xianshuai Chen
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
3D Printing ◽  
Porous Structure ◽  
Dental Implants ◽  
Dental Implant ◽  
Alveolar Bone ◽  
Element Analysis ◽  
Weak Part

In this paper, a complex porous dental implant with biodegradable magnesium alloy was designed based on selective laser melting (SLM). Finite element analysis (FEA) was used to simulate the stress distribution of dental implant and alveolar bone in two models of preliminary and later stages of implant. The stress concentration area of dental implants was found not in the porous structure, and the weak part of mechanical properties accords with the work requirements. The porous structure of dental implants can promote the function of cancellous bone in the process of conducting the stress of the dental implant, thus improving the bearing capacity of dental implants. In vitro fatigue experiments were carried out on the experimental samples produced by 3D printing. Through the cell contrast experiment, it was proved that the decomposed Mg2+ could reach the titanium surface smoothly through the porous structure and complete the proliferation of osteoblasts.

scholarly journals Accountants? perceptions regarding to business and profession ethics (A study on the alumnus of STIE Perbanas Surabaya)

2016 ◽  
Vol 5 (1) ◽  
pp. 87
Author(s):  
Dewi Setyorini ◽  
Nurul Hasanah Uswati Dewi
Keyword(s):  
Statistical Analysis ◽  
Sampling Technique ◽  
Primary Data ◽  
Analysis Tool ◽  
Significance Level ◽  
Purposive Sampling ◽  
Whitney Test ◽  
Mann Whitney Test ◽  
Statistical Analysis Tool ◽  
Accounting Student

This study is aimed to determine the differences in the perception of the accounting student alumnus of STIE Perbanas Surabaya regarding the ethics of business and profession based on gender. The type of data used is primary data using question-naires. The sampling technique is using non-probability samples based on purposive sampling technique. The number of samples processed is 85 respondents from the accounting student alumnus of STIE Perbanas Surabaya. The statistical analysis tool is the Mann Whitney Test using SPSS version 16.0. The first hypothesis of this study can be concluded that there are differences in the perceptions of the account-ing student alumnus regarding the ethics of business and accountant profession based on gender. The second hypothesis indicates that there is no difference in the perception of the accounting student alumnus regarding the ethics of business and accountant profession based on gender, which has a significance level under 0.05 or 5 percent.

Efektifitas Penggunaan Metode Pembelajaran Simulasi Dengan Latihan Terhadap Keterampilan Pengisian Partograf Pada Mahasiswa Semester II Di Prodi Kebidanan (D-III) Universitas Kadiri Tahun 2015

2017 ◽  
Vol 4 (1) ◽  
pp. 12
Author(s):  
Dessy Lutfiasari ◽  
Mahmudah Mahmudah
Keyword(s):  
Current Method ◽  
Skills Training ◽  
Health Sciences ◽  
Control Group ◽  
Learning Methods ◽  
Control Group Design ◽  
Significance Level ◽  
Whitney Test ◽  
Mann Whitney Test ◽  
Training Simulation

The use of the current method of learning very big influence on the growth and development of students' creativity and interest for all subjects to be taught, especially in the use of partograf. From interviews to the 10 students of IV semester Prodi Midwifery (D-III) Kadiri University is known that 4 (40%) of students said it was understood, 4 (40%) of other students say they are confused and 2 (20%) of them said that he was a student not familiar with partograf. This shows the lack of understanding of students in filling partograph. The research objective is to determine the effectiveness of the use of learning methods for skills training simulation with filling partograph the second semester students in Midwifery (D-III) Kadiri University Faculty of Health Sciences in 2015. The research design used is pre experiment with design Static Group Comparison/Posttest Only Control Group Design. The population studied were all students of the second semester in Midwifery (D-III) Faculty of Health Sciences University of Kadiri numbered 50 students and sampling techniques Federer totaled 32 students. This is a research instrument partograph sheet. Results of the study were analyzed using the Mann Whitney test with a significance level of 0.05 were used.The results showed 7 respondents (46.7%) are adept at using partograf with simulation teaching methods and 6 respondents (40.0%) are adept at using partograph with practice learning methods. Data were analyzed by Mann Whitney test obtained ρ = 0.965; α = 0.05 means that H0 is accepted and H1 rejected. This means there is no difference in the effective use of learning methods for skills training simulation with partograph filling. Based on the results of this study are expected to choose the method of learning as a learning method in charging partograph because both methods equally effective.; Keywords: simulation methods, drilling methods, partograph filling

scholarly journals Pilot Study of Acupuncture’s Antispasmodic Effect on Upper Gastrointestinal Tract during Endoscopic Submucosal Dissection for Early Gastric Cancer: Controlled Clinical Trial

2021 ◽  
Vol 10 (14) ◽  
pp. 3050
Author(s):  
Masao Suzuki ◽  
Naoto Ishizaki ◽  
Takumi Kayo ◽  
Taiga Furuta ◽  
Ryo Igarashi ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Gastrointestinal Tract ◽  
Endoscopic Submucosal Dissection ◽  
Controlled Trial ◽  
Upper Gastrointestinal Tract ◽  
Controlled Clinical Trial ◽  
Whitney Test ◽  
Submucosal Dissection ◽  
Mann Whitney Test ◽  
Upper Gastrointestinal

A prospective study was conducted in patients with early-stage gastric cancer to determine the efficacy and safety of acupuncture stimulation as an antispasmodic compared with conventional medication during the procedure of endoscopic submucosal dissection (ESD) of the upper gastrointestinal tract. This study was a prospective single blinded quasi-randomized controlled trial. Seventy-three patients who were scheduled to undergo ESD for gastric cancer at Aizu Medical Center between 19 February 2016 and 30 June 2016 were assessed for eligibility for the study. Sixty out of 73 patients were included in the study and assigned into two intervention groups: medication group (MG) and acupuncture group (AG). Ease of the procedure was evaluated using modified NIWA classification (MNC) by endoscopist considering the frequency and amplitude of the upper gastrointestinal peristalsis. For the statistical analysis, Mann–Whitney test was used to compare the differences of MNC values (baseline and end of procedure) between two groups. The difference of MNC found in the AG (−2.00 (−3.0 to −2.0)) was significantly greater than that in the MG (−1.00 (−2.0 to −1.0), p < 0.0001, Mann–Whitney test). We consider that acupuncture to the abdomen could be an alternative antispasmodic method during upper gastrointestinal endoscopic procedure.

scholarly journals An Overview on the Rheology, Mechanical Properties, Durability, 3D Printing, and Microstructural Performance of Nanomaterials in Cementitious Composites

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2950
Author(s):  
Hongwei Song ◽  
Xinle Li
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Three Dimensional ◽  
Cementitious Materials ◽  
Research Area ◽  
Cementitious Composites ◽  
Split Tensile Strength ◽  
Contour Crafting ◽  
Wide Range ◽  
Active Research

The most active research area is nanotechnology in cementitious composites, which has a wide range of applications and has achieved popularity over the last three decades. Nanoparticles (NPs) have emerged as possible materials to be used in the field of civil engineering. Previous research has concentrated on evaluating the effect of different NPs in cementitious materials to alter material characteristics. In order to provide a broad understanding of how nanomaterials (NMs) can be used, this paper critically evaluates previous research on the influence of rheology, mechanical properties, durability, 3D printing, and microstructural performance on cementitious materials. The flow properties of fresh cementitious composites can be measured using rheology and slump. Mechanical properties such as compressive, flexural, and split tensile strength reveal hardened properties. The necessary tests for determining a NM’s durability in concrete are shrinkage, pore structure and porosity, and permeability. The advent of modern 3D printing technologies is suitable for structural printing, such as contour crafting and binder jetting. Three-dimensional (3D) printing has opened up new avenues for the building and construction industry to become more digital. Regardless of the material science, a range of problems must be tackled, including developing smart cementitious composites suitable for 3D structural printing. According to the scanning electron microscopy results, the addition of NMs to cementitious materials results in a denser and improved microstructure with more hydration products. This paper provides valuable information and details about the rheology, mechanical properties, durability, 3D printing, and microstructural performance of cementitious materials with NMs and encourages further research.

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