scholarly journals The Influence of Elastic Modulus of Base Material on the Marginal Adaptation of Direct Composite Restoration

2010 ◽  
Vol 35 (4) ◽  
pp. 441-447 ◽  
Author(s):  
O-H. Kwon ◽  
D-H. Kim ◽  
S-H. Park
Keyword(s):  
Elastic Modulus ◽  
Clinical Relevance ◽  
Base Material ◽  
Marginal Adaptation ◽  
Base Materials ◽  
Flowable Composites ◽  
Composite Restoration

Clinical Relevance The use of RMGICs and flowable composites as base materials with the appropriate elastic modulus can reduce a marginal defect in an overlying composite restoration.

The Effect of Base Materials with Different Elastic Moduli on the Fracture Loads of Machinable Ceramic Inlays

10.2341/05-3 ◽  
2006 ◽  
Vol 31 (2) ◽  
pp. 180-187 ◽  
Author(s):  
S. Banditmahakun ◽  
W. Kuphasuk ◽  
W. Kanchanavasita ◽  
C. Kuphasuk
Keyword(s):  
Elastic Modulus ◽  
Clinical Relevance ◽  
Elastic Moduli ◽  
Base Material ◽  
Ceramic Inlays ◽  
High Elastic Modulus ◽  
Base Materials ◽  
Machinable Ceramic ◽  
Ceramic Inlay

Clinical Relevance Based on the results of this study, the elastic moduli of base materials had an influence on fracture loads of machinable ceramic inlays. The use of a base material with a high elastic modulus to support a ceramic inlay is recommended.

scholarly journals Prediction Model of Elastic Modulus for Granular Road Bases

2020 ◽  
Vol 2 (1) ◽  
pp. p35
Author(s):  
Zainab Ahmed Alkaissi ◽  
Hassan Adnan
Keyword(s):  
Elastic Modulus ◽  
Linear Regression Analysis ◽  
Base Material ◽  
Recycled Concrete ◽  
Dry Density ◽  
Concrete Aggregate ◽  
Vertical Loading ◽  
Base Materials ◽  
Granular Base ◽  
Road Bases

The estimation of elastic modulus for road bases is the primary objective of this research which is implemented a significant role in transmitting the vertical loading to the pavement foundation layers. In this study, the effect of weathering conditions on the stiffness of base course is investigated and implied the durability test by subjecting the prepared samples to a different numbers of wet-dry cycles (0,2, 4, 6, 8 and 10). A conventional base materials of local natural gravel aggregate and treated base materials with recycled concrete aggregate RCA at different percentages (0%, 25%, 50% 75% and 100%) is adopted in this research. The elastic characteristics are estimated in terms of elastic modulus. Elastic modulus are estimated by passing the ultrasonic pulse velocity through the untreated and treated base materials laboratory specimens. This test can be used to study the elastic modulus properties of base materials. A multiple linear regression analysis is used for prediction the elastic modulus using the SPSS (software ver.21). Elastic Modulus (kPa) is the dependent variable whereas the independent variable are; No. of wet- dry cycle and Percent (%) of RCA stabilizer. The obtained results for elastic modulus (Es) of granular base material layer showed increasing in elastic modulus with percentage of RCA%., results revealed that the (Es) values reached a maximum value of (6927kPa) for 100%. For the OMC’s values increases due to the percentage increment of RCA in granular base material mixture, this increment in water contents is refer to high absorption capacity of the paste clinging to the RCA. On other side the dry density decrease gradually with adding percentage of (RCA) in granular base material mixture.

The Influence of Different Base Materials on Marginal Adaptation of Direct Class II Composite Resin Restorations

2005 ◽  
Vol 288-289 ◽  
pp. 481-484
Author(s):  
Sung Ho Park ◽  
Yon Sang Cho ◽  
I.Y. Jung ◽  
Kwon Yong Lee ◽  
S.B. Jeon
Keyword(s):  
Mechanical Stress ◽  
Composite Resin ◽  
Base Material ◽  
Control Group ◽  
Marginal Adaptation ◽  
Base Materials ◽  
Before And After ◽  
Composite Resin Restorations ◽  
Entire Margin ◽  
Resin Restorations

The purpose of present study was to evaluate the influence of different base materials on the marginal integrity of posterior direct composite resin restorations. Conventional mesio-occluso-distal(MOD) cavity preparations, with margins in enamel and dentin, were prepared in 24 extracted human mandibular molars and randomly divided into four equal groups. One of three base materials (RMGI, compomer, flowable resin) was placed on the pulpal floors of the teeth of the groups. One group of teeth, which served as the control group, was not given any base material. Then, all teeth were restored with composite resin. The micromorphology of the tooth/restoration interfaces along the entire surfaces of the restorations was quantitatively analyzed using microscope at 150 magnifications immediately after finishing and after completion of thermo-mechanical stress. Marginal adaptation was assessed along the entire margin and % perfect margin (%PM) was calculated. The %PMs before and after thermo-mechanical stress in the groups were compared with Two- way ANOVA with Tukey test at the 95% confidence level. Before thermo-mechanical stress, there was no difference in marginal adaptation between groups. After the thermo-mechanical stress, the RMGI group showed the highest marginal adaptation rate among the tested groups. In compomer and flowable resin groups, the marginal adaptation was lower after thermomechanical stresses than before the stress (p<0.05).

scholarly journals Microleakage in Class II Restorations: Open vs Closed Centripetal Build-up Technique

2010 ◽  
Vol 35 (3) ◽  
pp. 308-313 ◽  
Author(s):  
A. Fabianelli ◽  
A. Sgarr ◽  
C. Goracci ◽  
A. Cantoro ◽  
S. Pollington ◽  
...  
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Marginal Adaptation ◽  
Sandwich Technique ◽  
Composite Restoration

Clinical Relevance Use of the centripetal open-sandwich technique may allow for placement of a Class II resin composite restoration with better marginal adaptation, fewer voids and reduced microleakage than the closed sandwich technique.

PMMA Demonstrated Higher Elastic Modulus and Nanohardness Compared with Polyamide Denture Base Materials

2017 ◽  
Vol 751 ◽  
pp. 643-648
Author(s):  
Hubban Nasution ◽  
Mansuang Arksornnukit
Keyword(s):  
Elastic Modulus ◽  
Polymethyl Methacrylate ◽  
Base Material ◽  
Strong Positive Correlation ◽  
Denture Base ◽  
Positive Correlation ◽  
Base Materials ◽  
Post Hoc ◽  
One Way Anova

The elastic modulus and nanohardness of denture bases may be different based on the type of material. The purpose of this study was to compare the elastic modulus and nanohardness of polyamide and polymethyl methacrylate (PMMA) denture base materials. Three polyamide denture base materials (Valplast, Lucitone FRS, and Thermoplastic Comfort System (TCS)) and one Polymethyl methacrylate (PMMA,Triplex Hot) denture base material (n=10) were evaluated to compare their elastic modulus and nanohardness values using an ultramicroindentation system (UMIS 2000; CSIRO, Lindfield, Australia). The data were statistically analyzed using one-way ANOVA, followed by Tukey HSD and Tamhane’s post hoc tests (α=.05). The elastic modulus and nanohardness of PMMA were significantly higher compared to the polyamide groups (P<.05). All the materials showed significant differences in each of their elastic modulus and nanohardness (P<.05). The values of nanohardness and elastic modulus of each group were as follows: Triplex Hot > Lucitone FRS > Valplast > TCS. The elastic modulus and nanohardness values varied among the polyamide denture base materials. PMMA showed higher elastic modulus and nanohardness than the polyamide. A strong positive correlation existed between elastic modulus and nanohardness of the denture bases tested (R2 = 0.979, P<.05).

scholarly journals Comparison of Proximal Contacts of Class II Resin Composite Restorations In Vitro

2006 ◽  
Vol 31 (6) ◽  
pp. 688-693 ◽  
Author(s):  
B. A. C. Loomans ◽  
N. J. M. Opdam ◽  
F. J. M. Roeters ◽  
E. M. Bronkhorst ◽  
R. C. W. Burgersdijk
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Composite Restorations ◽  
Composite Restoration

Clinical Relevance When placing a Class II resin composite restoration, the use of sectional matrix systems and separation rings to obtain tight proximal contacts is recommended.

Deposition of YSZ Layer by PS-PVD on Different Materials

2021 ◽  
Vol 320 ◽  
pp. 72-76
Author(s):  
Marek Góral ◽  
Tadeusz Kubaszek ◽  
Marek Poręba ◽  
Małgorzata Wierzbińska
Keyword(s):  
Vapour Deposition ◽  
Base Material ◽  
Deposition Process ◽  
Ceramic Layer ◽  
Process Time ◽  
Lower Plasma ◽  
Powder Feed Rate ◽  
Plasma Energy ◽  
Base Materials ◽  
Typical Process

Plasma Spray Physical Vapour Deposition (PS-PVD) method was designed for production of ceramic layer on nickel superalloys. In typical process before deposition the base material is heated by plasma up to 900 °C. In present article the yttria stabilized zirconia (YSZ) was deposited on low melting point materials: 2017A-type aluminium alloy and Cu-ETP copper. The influence of power current, process time and powder feed rate on structure and thickness of obtained coatings was analysed. During first deposition process the overheating of Al-sample was observed and as result the power current was decreased to 1600 A. In the next experimental the approx. 5 mm thick dense coating was formed. During experimental processes of YSZ deposition on copper the thickness of coating increased from approx. 5 to 22 mm. The copper-oxide layer was formed under ceramic layer. The microscopic assessment showed the difficulties in formation of columnar ceramic layer on use base materials. The obtained coating was characterized by dense structure as a result of lower plasma energy during process. The increasing of power current is not possible in the case of overheating of base material.

Material Behavior of 2D Steel Lattices with Different Unit-Cell Patterns

2021 ◽  
Vol 1046 ◽  
pp. 15-21
Author(s):  
Paiboon Limpitipanich ◽  
Pana Suttakul ◽  
Yuttana Mona ◽  
Thongchai Fongsamootr
Keyword(s):  
Elastic Modulus ◽  
Experimental Studies ◽  
Base Material ◽  
Unit Cell ◽  
Material Behavior ◽  
Closed Form Solutions ◽  
The Past ◽  
Weight Density ◽  
Unit Cells ◽  
Cell Patterns

Over the past years, two-dimensional lattices have attracted the attention of several researchers because they are lightweight compared with their full-solid counterparts, which can be used in various engineering applications. Nevertheless, since lattices are manufactured by reducing the base material, their stiffnesses then become lower. This study presents the weight efficiency of the lattices defined by relations between the elastic modulus and the weight density of the lattices. In this study, the mechanical behavior of 2D lattices is described by the in-plane elastic modulus. Experimental studies on the elastic modulus of the 2D lattices made of steel are performed. Three lattices having different unit cells, including square, body-centered, and triangular unit cells, are considered. The elastic modulus of each lattice is investigated by tensile testing. All specimens of the lattices are made of steel and manufactured by waterjet cutting. The experimental results of the elastic modulus of the lattices with the considered unit-cell patterns are validated with those obtained from finite element simulations. The results obtained in this study are also compared with the closed-form solutions founded in the literature. Moreover, the unit-cell pattern yielding the best elastic modulus for the lattice is discussed through weight efficiency.

scholarly journals Kajian Eksperimental Koefisien Redaman Akustik Bahan Pelapis Plat Dek Kapal

2018 ◽  
Vol 3 (1) ◽  
pp. 41
Author(s):  
Wibowo Harso Nugroho ◽  
Nanang J.H. Purnomo ◽  
Hardi Zen ◽  
Andi Rahmadiansah
Keyword(s):  
Absorption Coefficient ◽  
High Frequency ◽  
Transmission Loss ◽  
Base Material ◽  
Sound Insulation ◽  
Insulation Material ◽  
Base Materials ◽  
Specimen Material ◽  
Ship Classification ◽  
Technical Assessment

With the increasingly strict requirements of the ship classification bureau for permissible noise limits to allow passengers and crew to be more comfortable and secure a technical assessment is required to address the characteristics of the noise. A noise beyond the standard allowed in the vessel can be a problem to the ship operators. This noise problem will greatly affects the crews' comfort and passengers. One method to reduce the noise on a ship is to use sound insulation. This paper describes the method for determining the absorption coefficient α and the transmission loss (TL) through an acoustic test of a concrete insulation in the laboratory. The test was conducted by using the method of impedance tube where a speciment response measured by a microphone. In general, the properties of this insulation material remains as the main base material which is concrete. it has been found that the transmission loss value (TL) is in the range of 10 - 50 dB whereas for the base material the concrete is around 22 - 49 dB but the absorption coefficient α of the specimen material is much higher than the material of the base material especially in high frequency, which ranges from 0.15 to 0.97, whereas for concrete base materials have absorbent coefficient α ranges from 0.01 to 0.02.

scholarly journals Enhancement of the Tensile and the Compression Properties for Heat- Cured Acrylic Resin Denture Base Materials

2018 ◽  
Vol 15 (4) ◽  
pp. 449-454
Author(s):  
Baghdad Science Journal
Keyword(s):  
Polymethyl Methacrylate ◽  
Compression Strength ◽  
Base Material ◽  
Acrylic Resin ◽  
Tensile Tests ◽  
Strength Test ◽  
Denture Base ◽  
Compression Properties ◽  
Base Materials ◽  
Styrene Butadiene

This work aims to investigate the tensile and compression strengths of heat- cured acrylic resin denture base material by adding styrene-butadiene (S- B) to polymethyl methacrylate (PMMA). The most well- known issue in prosthodontic practice is fracture of a denture base. All samples were a blend of (90%, 80%) PMMA and (10%, 20%) S- B powder melted in Oxolane (Tetra hydro furan). These samples were chopped down into specimens of dimensions 100x10x2.5mm to carry out the requirements of tensile tests. The compression strength test specimens were shaped into a cylinder with dimensions of 12.7mm in diameter and 20mm in length. The experimental results show a significant increase in both tensile and compression strengths when compared to control (standard) results for the preparation material.

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