scholarly journals THE EFFECT OF RETENTION FORMS ON ACRYLIC BASE SURFACES ON ADHESIVE STRENGTH OF DENTURE RELINER MATERIALS

2021 ◽  
Vol 4 (3) ◽  
pp. 100
Author(s):  
Endang Prawesthi ◽  
Handoko Tirta ◽  
Rahmaniawati Rahmaniawati
Keyword(s):  
Tensile Strength ◽  
Ethyl Acetate ◽  
Adhesive Strength ◽  
Control Group ◽  
Base Surface ◽  
Long Time ◽  
New Material ◽  
Materials Used ◽  
Block Width ◽  
Almost All

Background: Acrylic prosthesis that are used for a long time are often not sticky anymore and easy off. Treatment that can be done is relining, which is resurfacing with new material addition to prosthesis surface in contact with mucosa. One of materials used is denture reliner made of acrylic material (heat and self cured acrylic). The successful use of this reliner material depends on the retention of acrylic base surface. There is some retentions namely bur strokes, ethyl acetate and Al2O3 sandblast. Purpose: To determine effect of retention in form of bur strokes, Ethyl Acetate and Al2O3 sandblast on acrylic bases surface on adhesive strength of reliner denture material. Method: Research using samples in form of acrylic blocks with a length of 80mm, a large block width of 10  x10 mm and small block of 10 x 8 mm, reliner material thickness is 3 mm. Total of 64 samples were divided into 2 groups based on reliner materials (heat and self) and each group was divided into 4 groups based on treatment (control, bur stroke, ethyl acetat and Al2O33 sandblast).  All samples were subjected to tensile test using UTM to obtain tensile strength values. Result: Heat CA tensile strength value was greater than self CA and the two groups were significantly different (p<0.05), while lowest tensile strength value in control group followed by  ethyl acetate and  largest value in Al2O3 sandblast  and almost all groups were significantly different (p<0.05). Conclusion: Heat CA is more adhesive than self CA and  retention on acrylic surface is proven to be effective in increasing adhesive strength of acrylic surface against denture reliner.

scholarly journals Penerapan Pijat Bayi Terhadap Peningkatan Berat Badan Bayi Usia 1-3 Bulan : Literature Review

2021 ◽  
Vol 1 ◽  
pp. 1977-1983
Author(s):  
Runi Karin Majid ◽  
Aida Rusmariana
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Literature Review ◽  
Massage Therapy ◽  
Control Group ◽  
Maximum Value ◽  
Before And After ◽  
Long Time ◽  
Almost All ◽  
Experimental Group

AbstractBaby massage is one of the oldest and most popular types of stimulation or touch therapy that is has been practiced for a long time almost all over the world, including in Indonesia for generations. Baby massage has many benefits if done regularly, one of which can increase body weight. The purpose of this study was to know the weight of babies aged 1-3 months before and after being given baby massage. The method was a literature review of three research articles from Google Sholar used keywords including baby massage, weight gain, infants aged 1-3 months and articles published in the last 10 years. The results of the literarture review of three articles in the experimental group, before being given baby massage, was the median value of 4,592 grams and the minimum-maximum value of 3,533-5,933 grams. The control group had a median value of 4,258 grams and a minimum-maximum value of 3,533-5,200 grams. The experimental group after being given baby massage had a median value of 5,717 grams and a minimum-maximum value of 4,433-6,900 grams. While the control group had a median value of 4,767 grams and a minimum-maximum value of 3,967-5,633 grams. The conclusion of the literature review from these three articles is that baby massage has an effect on increasing body weight in infants aged 1-3 months. The results of the three articles that had been reviewed are babies who get massage therapy had a higher weight gain compared to babies who do not get massage therapy. It is suggested for nurses to be able to apply and provide education to parents to do baby massage in order to overcome the problem of baby growth and development especially the problem of baby massage.Keywords: Infants aged 1-3 months, Baby massage, Eigh gain AbstrakPijat bayi merupakan salah satu jenis stimulasi atau terapi sentuhan tertua dan terpopuler yang sudah lama dilakukan hampir di seluruh dunia termasuk di Indonesia secara turun temurun. Pijat bayi yang dilakukan secara rutin akan memberikan banyak manfaat yaitu salah satunya dapat meningkatkan berat badan. Tujuan dari penulisan ini yaitu untuk mengetahui berat badan bayi usia 1-3 bulan sebelum dan sesudah diberikan pijat bayi. Metode penulisan menggunakan literature review dari tiga artikel penelitian yang didapatkan dari google scholar dengan kata kunci pijat bayi, peningkatan berat badan dan bayi usia 1-3 bulan dan minimal terbit 10 tahun terakhir. Hasil dari literature review ketiga artikel ilmiah sebelum diberikan pijat bayi pada kelompok eksperimen memiliki nilai median 4.592 gram dan nilai minimum-maksimum 3.533-5.933 gram. Pada kelompok kontrol memiliki nilai median 4.258 gram dan nilai minimum-maksimum 3.533-5.200 gram. Sesudah diberikan pijat bayi pada kelompok eksperimen memiliki nilai median 5.717 gram dan nilai minimum-maksimum 4.433-6.900 gram. Sedangkan pada kelompok kontrol memiliki nilai median 4.767 gram dan nilai minimum-maksimum 3.967-5.633 gram. Simpulan literatur review dari ketiga artikel ilmiah yaitu pijat bayi sama-sama memiliki pengaruh untuk meningkatkan berat badan pada bayi usia 1-3 bulan. Hasil dari ketiga artikel ilmiah yang telah dilakukan literature review menunjukkan bahwa bayi yang mendapatkan pijat mengalami peningkatan berat badan lebih tinggi dibandingkan dengan bayi yang tidak mendapatkan terapi pijat. Saran bagi perawat untuk dapat menerapkan dan memberikan edukasi kepada orang tua untuk melakukan pijat bayi guna mengatasi masalah tumbuh kembang pada bayi terutama masalah berat badan bayi.Kata kunci: Bayi Usia 1-3 Bulan; Pijat bayi; Peningkatan Berat Badan

scholarly journals Mechanical properties and microstructural analysis of an AgPd alloy cast under different temperatures

2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Karina Andrea Novaes Olivieri ◽  
Maximiliano Piero Neisser ◽  
Marco Antônio Bottino ◽  
Milton Edson Miranda ◽  
Rafael Dario Wernek
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperatures ◽  
Microstructural Analysis ◽  
Casting Temperature ◽  
Control Group ◽  
Significant Difference ◽  
Different Temperatures ◽  
Long Time ◽  
New Material ◽  
T1 And T2

The metal restorations are used in Dentistry a long time ago. Nowadays we have resources that can get casting more accurate, with new material and equipments and techniques more precise. The purpose of this study was to evaluate the metallurgical and mechanical aspects of the AgPd dental alloy when it was submitted to different casting temperatures. It was used 30 specimens, divided in three groups (n=10): a) control group (no cast); b) casting temperature in accordance with the manufactures’ instructions (T1); b) casting temperature above manufactures´ instructions (like a torch) (T2). It was evaluated chemical and metallographic aspects, mechanical properties and Vickers hardness. The results showed a microstructure similar to T1 and T2 conditions, but with greater amount of light phase and particles in this last one. It was observed that the rupture tensile strength for the T1 condition was greater than the T2. The alloy in the no cast condition presented greater hardness but there was no statistically significant difference between T1 and T2. Supporting by the metallographic and mechanical results, it may predict that when elevated temperatures was used, above manufacture´s recommendations, it can occur failures in the prosthesis, like porosities, fissures or cracks.

scholarly journals Pembuatan film plastik biodegradable dari limbah kulit kopi dengan penambahan kitosan/gliserol

2020 ◽  
Vol 4 (1) ◽  
pp. 38
Author(s):  
Edwin Rizki Safitra ◽  
Idra Herlina
Keyword(s):  
Tensile Strength ◽  
Raw Materials ◽  
Biodegradable Plastic ◽  
Optimum Conditions ◽  
Plastic Films ◽  
Waste Glycerol ◽  
Chitosan Concentration ◽  
Long Time ◽  
Standard Value ◽  
Materials Used

Biodegradable plastic production has been developed for a long time by researchers. Data from Ministry of Industry in 2017 stated Indonesia's plastic production reached 3.9 million tons/ year. In this study, the raw materials used came from untapped waste, namely coffee skin, biodiesel-waste glycerol and shrimp-shells chitosan. In this research, biodegradable plastic films have been produced with the addition of glycerol and coffee skin waste with chitosan concentration variations of 0, 2, 4, 6, and 8%. After the optimum conditions were obtained by comparing the elongation and tensile strength values, then the variations in coffee skin waste were added with a weight of 0, 2, 4, 6, and 8 g. Tensile strength and elongation values with variations of chitosan were 0.2-1.87 MPa and 0.22-0.15%, respectively. Whereas the variation of tensile strength and elongation coffee skins were 1.8-0.27 MPa and 0.14-0.2%, respectively. The optimum conditions for producing biodegradable plastic films were obtained with variations of chitosan 4% and 2 g coffee skin with tensile strength and elongation values of 0.98 MPa and 0.16%. The tensile strength and elongation data produced from biodegradable plastic was still below the standard value of commercial plastic or synthetic plastic (HDPE) with values of tensile strength and elongation of 28.64 MPa and 6.5186% respectively.

Students’ Experience in Learning Accounting via Open and Distance Learning (ODL)

2020 ◽  
Vol 7 (1) ◽  
pp. 29-40
Author(s):  
Nur Syafiqah Hussin ◽  
Naqiah Awang ◽  
Farah Husna Mohd Fatzel
Keyword(s):  
Distance Learning ◽  
Traditional Classroom ◽  
Financial Accounting ◽  
Way Of Life ◽  
Internet Connection ◽  
New Material ◽  
The Subject ◽  
Open And Distance Learning ◽  
Catch Up ◽  
Almost All

Covid-19 is an unprecedented crisis that has affected almost all industry players including education. It has transformed our way of life and introduced a new normal to how things are done. As an effort to contain the outbreak of pandemic Covid-19, universities have shifted to online learning. In line with this, Universiti Teknologi MARA (UiTM) has decided to execute open and distance learning (ODL) for the current semester until 31 December 2020. ODL introduces a different learning environment as compared to the traditional classroom that requires students to be self-reliant in learning new things. Hence, the purpose of the study is to explore students’ experiences in the process of knowledge transfer through ODL specifically for accounting subjects. A questionnaire was distributed to students who were taking the subject of Introduction to Financial Accounting and Introduction to Cost Accounting in UiTM Pahang Kampus Raub and a total of 206 responses were received. The study found over half of the students enjoy learning through ODL but only one-third were looking forward to having ODL for the next semester. Poor internet connection is the main reason found in the study that makes ODL not preferred by the students. At the same time, few features were highlighted by the students about ODL such as the advantage of pre-recorded video to catch up the new material and flexibility for them to learn at their own pace.

Calculations used for assessment of rapid maxillary expansion

ORL ro ◽  
2016 ◽  
Vol 1 (1) ◽  
pp. 24-26
Author(s):  
Ruxandra Bartok ◽  
Bogdan Dimitriu Dimitriu ◽  
Constantin Vârlan ◽  
Radu Stanciu ◽  
Georgiana Moldoveanu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elasticity Modulus ◽  
Rapid Maxillary Expansion ◽  
Laboratory Animals ◽  
Maxillary Expansion ◽  
Literature Reference ◽  
Bone Changes ◽  
Upper Jaw ◽  
Materials Used

Rapid maxillary expansion is defined as the release of medio-palatine suture using an orthopedic forces. The role of this procedure is to expand  the upper jaw in order to achieve the  broadening of the upper arch. This study was initiated to quantify the effects of disjunction and post- treatment bone changes, after an adequate contention which lasted for three weeks. This study  is  carried on laboratory animals (common breed rabbit) to determine tensile strength and the elasticity modulus of  biological materials  used in orthdodontics. The results of the study are consistent with those reported in the literature reference.  

A Thorough Theoretical Exploration of Intriguing Characteristics of Cyclo[18]carbon: Geometry, Bonding Nature, Aromaticity, Weak Interaction, Reactivity, Excited States, Vibrations, Molecular Dynamics and Various Molecular Properties

2019 ◽  
Author(s):  
Tian Lu ◽  
Qinxue Chen ◽  
Zeyu Liu
Keyword(s):  
Molecular Dynamics ◽  
Excited States ◽  
Electronic Excitation ◽  
Ring Structure ◽  
Molecular Properties ◽  
Molecular Vibration ◽  
Full Characterization ◽  
Long Time ◽  
Almost All

Although cyclo[18]carbon has been theoretically and experimentally investigated since long time ago, only very recently it was prepared and directly observed by means of STM/AFM in condensed phase (Kaiser et al., <i>Science</i>, <b>365</b>, 1299 (2019)). The unique ring structure and dual 18-center π delocalization feature bring a variety of unusual characteristics and properties to the cyclo[18]carbon, which are quite worth to be explored. In this work, we present an extremely comprehensive and detailed investigation on almost all aspects of the cyclo[18]carbon, including (1) Geometric characteristics (2) Bonding nature (3) Electron delocalization and aromaticity (4) Intermolecular interaction (5) Reactivity (6) Electronic excitation and UV/Vis spectrum (7) Molecular vibration and IR/Raman spectrum (8) Molecular dynamics (9) Response to external field (10) Electron ionization, affinity and accompanied process (11) Various molecular properties. We believe that our full characterization of the cyclo[18]carbon will greatly deepen researchers' understanding of this system, and thereby help them to utilize it in practice and design its various valuable derivatives.

A Thorough Theoretical Exploration of Intriguing Characteristics of Cyclo[18]carbon: Geometry, Bonding Nature, Aromaticity, Weak Interaction, Reactivity, Excited States, Vibrations, Molecular Dynamics and Various Molecular Properties

2019 ◽  
Author(s):  
Tian Lu ◽  
Qinxue Chen ◽  
Zeyu Liu
Keyword(s):  
Molecular Dynamics ◽  
Excited States ◽  
Electronic Excitation ◽  
Ring Structure ◽  
Molecular Properties ◽  
Molecular Vibration ◽  
Full Characterization ◽  
Long Time ◽  
Almost All

Although cyclo[18]carbon has been theoretically and experimentally investigated since long time ago, only very recently it was prepared and directly observed by means of STM/AFM in condensed phase (Kaiser et al., <i>Science</i>, <b>365</b>, 1299 (2019)). The unique ring structure and dual 18-center π delocalization feature bring a variety of unusual characteristics and properties to the cyclo[18]carbon, which are quite worth to be explored. In this work, we present an extremely comprehensive and detailed investigation on almost all aspects of the cyclo[18]carbon, including (1) Geometric characteristics (2) Bonding nature (3) Electron delocalization and aromaticity (4) Intermolecular interaction (5) Reactivity (6) Electronic excitation and UV/Vis spectrum (7) Molecular vibration and IR/Raman spectrum (8) Molecular dynamics (9) Response to external field (10) Electron ionization, affinity and accompanied process (11) Various molecular properties. We believe that our full characterization of the cyclo[18]carbon will greatly deepen researchers' understanding of this system, and thereby help them to utilize it in practice and design its various valuable derivatives.

Alteration of intrapancreatic serotonin, homocysteine, TNF-α, and NGF levels as predisposing factors for diabetes following exposure to 900-MHz waves

2021 ◽  
pp. 074823372110226
Author(s):  
Gholamali Jelodar ◽  
Mansour Azimzadeh ◽  
Fatemeh Radmard ◽  
Narges Darvishhoo
Keyword(s):  
Cell Damage ◽  
Pancreatic Beta Cell ◽  
Predisposing Factors ◽  
Male Rats ◽  
Control Group ◽  
Predisposing Factor ◽  
Time Exposure ◽  
Tnf Α ◽  
Long Time ◽  
Short Time

Exposure to mobile phone radiation causes deleterious health effects on biological systems. The objects of this study were to investigate the effect of 900-MHz radiofrequency waves (RFW) emitted from base transceiver station antenna on intrapancreatic homocysteine (Hcy), tumor necrosis factor-α (TNF-α), and nerve growth factor (NGF) as predisposing factors involved in pancreatic beta cell damage. Thirty male rats (Sprague-Dawley, 200 ± 10 g) were randomly divided into the control (without any exposure) and exposed groups: short time (2 h/day), long time (4 h/day), and exposed to 900-MHz RFW for 30 consecutive days. On the last days of the experiment, animals were killed and pancreas tissue was dissected out for evaluation of serotonin, Hcy, TNF-α, and NGF. There was a significant decrease in the serotonin and NGF levels in the pancreatic tissue of exposed groups compared to the control group ( p < 0.05). Also, the levels of serotonin and NGF in the long-time exposure were significantly lower than the short-time exposure ( p < 0.05). However, levels of Hcy and TNF-α were significantly increased in the pancreas of exposed groups compared to the control groups ( p < 0.05). Exposure to 900-MHz RFW decreased pancreatic NGF and serotonin levels and increased the proinflammatory markers (Hcy and TNF-α), which can be a predisposing factor for type 2 diabetes.

scholarly journals Environmentally Friendly, High-Performance Fire Retardant Made from Cellulose and Graphite

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2400
Author(s):  
Leandra P. Santos ◽  
Douglas S. da Silva ◽  
Thais H. Morari ◽  
Fernando Galembeck
Keyword(s):  
High Performance ◽  
Raw Materials ◽  
Fire Retardant ◽  
Visual Observation ◽  
Flame Resistance ◽  
New Developments ◽  
New Class ◽  
New Material ◽  
Accredited Laboratory ◽  
Materials Used

Many materials and additives perform well as fire retardants and suppressants, but there is an ever-growing list of unfulfilled demands requiring new developments. This work explores the outstanding dispersant and adhesive performances of cellulose to create a new effective fire-retardant: exfoliated and reassembled graphite (ERG). This is a new 2D polyfunctional material formed by drying aqueous dispersions of graphite and cellulose on wood, canvas, and other lignocellulosic materials, thus producing adherent layers that reduce the damage caused by a flame to the substrates. Visual observation, thermal images and surface temperature measurements reveal fast heat transfer away from the flamed spots, suppressing flare formation. Pinewood coated with ERG underwent standard flame resistance tests in an accredited laboratory, reaching the highest possible class for combustible substrates. The fire-retardant performance of ERG derives from its thermal stability in air and from its ability to transfer heat to the environment, by conduction and radiation. This new material may thus lead a new class of flame-retardant coatings based on a hitherto unexplored mechanism for fire retardation and showing several technical advantages: the precursor dispersions are water-based, the raw materials used are commodities, and the production process can be performed on commonly used equipment with minimal waste.

Quantitative analysis of static equilibrium in women after mastectomy

2014 ◽  
Vol 14 (1) ◽  
pp. 81-87
Author(s):  
Maciej Rachwał ◽  
Justyna Drzał-Grabiec ◽  
Katarzyna Walicka-Cupryś ◽  
Aleksandra Truszczyńska
Keyword(s):  
Mean Amplitude ◽  
Control Group ◽  
Foot Pressure ◽  
Locomotor System ◽  
Center Of Foot Pressure ◽  
The Mean ◽  
Almost All ◽  
Posture Stability ◽  
Mastectomy Group ◽  
Better Than

Abstract Background: The post-mastectomy changes to the locomotor system are related to the scar and adhesion or to the lymphatic edema after amputation which, in turn, lead to local and global distraction of the work of the muscles. These changes lead to body statics disturbance that changes the projection of the center of gravity and worsens motor response due to changing of the muscle sensitivity. Objective: The aim of the study was to evaluate the static balance of women after undergoing mastectomy. Methods: The study included 150 women, including 75 who underwent mastectomy (mean age: 60±7.6) years, mean body mass index (BMI): 26 (±3.6) kg/m2) and 75 who were placed in the control group with matched age and BMI. The study was conducted using a tensometric platform. Results: Statistically significant differences were found for almost all parameters between the post-mastectomy group and group of healthy women, regarding center of foot pressure (COP) path length in the Y and X axes and the mean amplitude of COP. Conclusions: First, the findings revealed that balance in post-mastectomy women is significantly better than in the control group. Second, physiotherapeutic treatment of post-mastectomy women may have improved their posture stability compared with their peers.

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