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Journal articles on the topic 'Ceramic piston crown design'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Koski, Juhani, and Risto Silvennoinen. "Multicriteria design of ceramic piston crown." Engineering Costs and Production Economics 20, no. 2 (1990): 175–89. http://dx.doi.org/10.1016/0167-188x(90)90101-m.

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2

Mahalingam, S., S. Ganesan, H. Yashik Ahammed, and V. Venkatesh. "Effect on Performance and Emission Analysis of Advanced Ceramic Material Coated Piston Crown Using Plasma Spray Coating Techniques." Applied Mechanics and Materials 766-767 (June 2015): 612–17. http://dx.doi.org/10.4028/www.scientific.net/amm.766-767.612.

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Advanced ceramic coating technologies are commonly used as metal coatings for internal combustion engine components and aerospace application. The thermal barrier coatings are being applied to the engine components to increasing life and improve the performance of the engine. This experimental study is focused on advanced ceramic material of Zirconia stabilized with the yttrium oxide (Zirconia 80% wt and Yttia 20 % by weight) applied on the piston crown for analyzing the performance and emission characteristics of the diesel engine. By using ceramics coated piston crown, the brake thermal effi

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3

Helmisyah, A. J., Shahrir Abdullah, and Mariyam Jameelah Ghazali. "Effect of Thermal Barrier Coating on Piston Crown for Compressed Natural Gas with Direct Injection Engine." Applied Mechanics and Materials 52-54 (March 2011): 1830–35. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1830.

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The top land of a piston normally known as the piston crown is an engine part that is continuously exposed to extreme temperature and pressure during combustion. For a compression ratio level, the compressed natural gas with a direct injection system (CNGDI) typically uses a range of compression ratio between gasoline and diesel engines, producing extremely high temperature and pressure which lead to high thermal stresses. Consequently, the piston crown is exposed to direct combustion due to the vertical movement of the piston, leading to various possible damages of thermal stresses. In contra

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4

Chitthaarth, M. R., and K. Manivannan. "Thermal Analysis of Ceramic Coated Aluminium Piston with Slots." Applied Mechanics and Materials 592-594 (July 2014): 786–90. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.786.

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The main aim is to control thermal expansion in aluminium piston at high working condition. A plasma sprayed ceramic coating (TBC) is applied on the piston crown as a top coat and NiCrAl is applied as the middle layer as bond coat to improve the addition strength between the top coat and the metal subtract layer as AlSi alloy; we introduce a thermal slot on the piston shrink to regulate the heat flow in piston and make it cooler. We analyse the piston with these two implementations to determine the thermal analysis of the piston. The results can be shown in the various comparisons of coating t

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5

Kosmač, Tomaž, Aleš Dakskobler, Mihael Kermc, and Zmago Stadler. "Ceramic Piston for Hydraulic Brakes: Design Study." Advances in Science and Technology 45 (October 2006): 1771–75. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1771.

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A design study for ceramic pistons was undertaken in order to address the overheating problems associated with the caliper during aggressive braking using modern C/C-SiC brake discs. The reasoning behind the piston design and the choice of the shaping technology are explained. Zirconia-toughened mullite (ZTM) ceramic was chosen for the pistons, because this material exhibits a low thermal conductivity, sufficiently high mechanical strength and fracture toughness, as well as very good thermal-shock resistance. The manufacturing technology of experimental ceramic brake pistons involved compoundi

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6

Jalaludin, Helmisyah Ahmad, Shahrir Abdullah, Mariyam Jameelah Ghazali, Bulan Abdullah, and Nik Rosli Abdullah. "Effect of Extreme Temperatures on Coated Piston Crown for CNGDI Engine." Applied Mechanics and Materials 393 (September 2013): 281–86. http://dx.doi.org/10.4028/www.scientific.net/amm.393.281.

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Due to high temperature and less proper heat transfer, the material of piston crown in an engine of compressed natural gas with a direct injection system (CNGDI) may lead to high thermal stresses and fails to withstand high temperature and operate effectively. By insulating with thermal barrier coating (TBC) such as ceramic-based yttria partially stabilised zirconia (YPSZ), heat transfer to the piston might be reduced and lead to improvement of piston durability. Hence, in this research, YPSZ coating was utilised to differentiate with the uncoated piston crowns in terms of the ability to reduc

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7

Helmisyah, Ahmad Jalaludin, Shahrir Abdullah, and Mariyam Jameelah Ghazali. "Heat Transfer Characteristic of Thermal Barrier Coated Piston Crown for a Compressed Natural Gas Direct Injection Engine." Applied Mechanics and Materials 663 (October 2014): 304–10. http://dx.doi.org/10.4028/www.scientific.net/amm.663.304.

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Compressed natural gas with direct injection (CNGDI) engine produces high temperature and pressure ultimately leading to high thermal stress. The piston crown material fails to withstand high temperature and operate ineffectively due to improper heat transfer. By insulating the surface namely; thermal barrier coating (TBC) such as ceramic based yttria partially stabilised zirconia (YPSZ), heat transfer to the piston might be reduced and lead to improvement of piston durability. Hence, in this research, YPSZ/NiCrAl coating was utilised to differentiate with the uncoated piston crowns in terms o

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8

Wang, Q., Y. Cao, R. Wang, F. Mignano, and G. Chen. "Studies of a Heat-Pipe Cooled Piston Crown." Journal of Engineering for Gas Turbines and Power 122, no. 1 (1999): 99–105. http://dx.doi.org/10.1115/1.483181.

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Designing pistons with effective cooling is crucial to preventing piston failure and improving engine service life. A piston design that incorporates the heat-pipe cooling technology may provide a new approach that could improve the thermal-tribological performance of heavy-duty diesel engine pistons. A simplified piston crown with an annular reciprocating heat pipe is constructed to demonstrate this concept. The piston crown is experimentally tested on a specially designed reciprocating apparatus. Experimental data indicate that the annular heat-pipe cooling can greatly assist in reducing the

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9

Velavan, A., C. G. Saravanan, and M. Vikneswaran. "The Impact of Formation of Oxide Layer on the Piston Crown Using Micro - Arc Oxidation on the Characteristics of the Spark Ignition Engine." Key Engineering Materials 813 (July 2019): 31–36. http://dx.doi.org/10.4028/www.scientific.net/kem.813.31.

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In the present study, experiments were conducted to compare the effect of oxide layer formation on the piston crown coated using Micro-Arc Oxidation (MAO) with uncoated piston on the combustion and emission characteristics of the port injected Spark Ignition engine fueled by gasoline. The micro-arc oxidation (MAO) coating technique is the modern process to form a ceramic oxide layer on the reactive metal substrate (base metal) by electrochemical and electro-thermal oxidation in an alkaline electrolytic solution. Using MAO technique, an oxide layer of thickness 72 μm was formed on the piston cr

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10

Reddy, S. Sunit Kumar, and V. Pandurangadu. "INVESTIGATIONS ON CERAMIC COATED DIESEL ENGINE WITH BRASS PISTON MATERIAL." Journal of Mechanical Engineering 44, no. 1 (2014): 10–17. http://dx.doi.org/10.3329/jme.v44i1.19492.

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With the enormous energy demand and environmental concern the interest on the alternate fuels tothe diesel engines has been increased. Among all the fuels alcohols have received a considerable attentionbecause these are bio-based, renewable and are oxygenated. But due to its properties they require higheroperating temperatures in the combustion chambers. Hence in the present work a ceramic coated insulatedengine is developed by incorporating an air gap between piston skirt and crown for the study of alcoholsperformance and emission characteristics. The combustion efficiency depends on the mixt

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11

K., Vijaya, Shailesh Palaparty, Raghavan Srinivasa, and Ravi Kumar Puli. "Investigations on performance of diesel engine by varying injection timings with design modification on piston crown." World Journal of Engineering 15, no. 5 (2018): 562–66. http://dx.doi.org/10.1108/wje-11-2017-0348.

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Purpose Investigations are carried out with the aim of improving performance of a diesel engine with the design modification on piston crown to stimulate the uniform combustion by inducing turbulence in the incoming charge. Design/methodology/approach A stirrer is introduced at the top of the piston so as to inculcate more turbulence to the incoming charge by improving the rate of fuel vaporization. Whirling motion is created in the combustible mixture by providing rotating blades on the cavity/bowl of the reciprocating piston head. By putting a simple link mechanism, the oscillatory motion of

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12

Jalaludin, Helmisyah Ahmad, Shahrir Abdullah, Mariyam Jameelah Ghazali, Bulan Abdullah, and Nik Rosli Abdullah. "Experimental Study of Ceramic Coated Piston Crown for Compressed Natural Gas Direct Injection Engines." Procedia Engineering 68 (2013): 505–11. http://dx.doi.org/10.1016/j.proeng.2013.12.213.

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13

Pan, Zhongjian, and Lei Guo. "Failure Analysis of the Pin Bore of the Combined Piston for the Aero Engine." International Journal of Aerospace Engineering 2019 (December 21, 2019): 1–13. http://dx.doi.org/10.1155/2019/7693403.

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The combined piston can be used in an aero piston heavy fuel engine because of its light weight, so as to reduce the reciprocating inertia force and improve the engine power-weight ratio. However, the pin bore of the combined piston is prone to deform leading to the failure of the piston. Based on the structure of the piston, the stress of the piston under thermomechanical coupling is analyzed, the temperature field of the piston is determined by experiments, and the deformation rule of the piston pin bore under the thermomechanical coupling is summarized. A design scheme is proposed to change

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14

JIN, Peng, and Jung-Sik KIM. "Design and Fabrication of a Micro Reciprocating Engine." Combustion Engines 122, no. 3 (2005): 32–41. http://dx.doi.org/10.19206/ce-117398.

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This paper presents an ongoing project of developing a micro reciprocating internal combustion engine. The engine is designed on the basis of a two stroke piston engine, but heavy modifications have been made to suit the 2D MEMS fabrication. All the engine parts are located in two layers. Piston seals are not used and leakage is prevented by the introduction of microgrooves on the piston, tight tolerance control and an extended contact area between the piston and the cylinder. With the assistance of a film of lubrication oil, these measures prove effective in preventing leakage. A new approach

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15

Xu, Qin Chao, Shu Zong Wang, and Yong Qing Lian. "Thermal Transfer Boundary Condition and Thermal Load of Piston for Torpedo Cam Engines." Materials Science Forum 704-705 (December 2011): 619–24. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.619.

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Piston of cam engines for torpedo works in terrible condition and always be caused fatigue breakdown by thermal load. In this paper, the thermal boundary condition of different piston parts are ascertained, such as the crown surface of piston and high-temp gas, the side of piston and cooling water, and the skirt of piston and cooling oil. Then the piston’s temperature field is obtained by using the finite element analysis software. This result provides the practical reference for further improving the structure and optimizing the design of the piston. Keywords: cam engine; piston; heat-transfe

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16

Ito, Yasuko, Hiroshi Iijima, and Yoshiaki Hata. "Coping Design for Porcelain Fused to Castable Ceramic Crown." Nihon Hotetsu Shika Gakkai Zasshi 40, no. 3 (1996): 551–63. http://dx.doi.org/10.2186/jjps.40.551.

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17

Towoju, Olumide Adewole, Ademola A. Dare, and Samson K. Fashogbon. "Experimental investigation of the performance and emission characteristics of a CI engine equipped with a modified truncated cone piston crown operated on diesel and shea-butter biodiesel." European Journal of Engineering Research and Science 3, no. 10 (2018): 126–31. http://dx.doi.org/10.24018/ejers.2018.3.10.954.

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Biodiesels and Improved combustion chamber design have better in-cylinder air motion which positioned them to offer increased advantages in addressing the major concern of high emission and low thermal efficiency of compression ignition engines. This study therefore investigated the impact of Shea-butter biodiesel and redesigned combustion chamber on the performance and emission characteristics of a compression ignition engine. Biodiesel was prepared from Shea-butter using the standard process. Experiments were conducted on a Yoshita-165F engine operated on a blend of AGO and Shea-butter biodi

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18

Lawn, B. R., Y. Deng, I. K. Lloyd, M. N. Janal, E. D. Rekow, and V. P. Thompson. "Materials Design of Ceramic-based Layer Structures for Crowns." Journal of Dental Research 81, no. 6 (2002): 433–38. http://dx.doi.org/10.1177/154405910208100615.

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Radial cracking has been identified as the primary mode of failure in all-ceramic crowns. This study investigates the hypothesis that critical loads for radial cracking in crown-like layers vary explicitly as the square of ceramic layer thickness. Experimental data from tests with spherical indenters on model flat laminates of selected dental ceramics bonded to clear polycarbonate bases (simulating crown/dentin structures) are presented. Damage initiation events are video-recorded in situ during applied loading, and critical loads are measured. The results demonstrate an increase in the resist

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19

Hu, Wei Wen, Bai Qing Zhang, and Jing Hua Fen. "Research of the Parameter for the Piston’s Configuration in the Tile Press’s Moving Beam." Key Engineering Materials 474-476 (April 2011): 498–502. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.498.

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Through the geometry models of ceramic powders flan and move beam and piston established, and the actual ceramic powders parameters and the pressure of tile press defined and loaded, the individual effects were analyzed in the single-acting and the dual-acting piston-cylinder in the process of the power compaction, which also offered the theory basis for the design in the move beam in the future at the same time.

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20

Silva, N. R. F. A., E. A. Bonfante, B. T. Rafferty, et al. "Modified Y-TZP Core Design Improves All-ceramic Crown Reliability." Journal of Dental Research 90, no. 1 (2010): 104–8. http://dx.doi.org/10.1177/0022034510384617.

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21

Vijaya Kumar, K., P. Shailesh, K. Srinivasa Raghavan, J. A. Ranga Babu, and P. Ravi Kumar. "Performance and emission analysis of diesel engine with design modifications on piston crown." International Journal of Ambient Energy 41, no. 12 (2018): 1336–41. http://dx.doi.org/10.1080/01430750.2018.1517664.

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22

Hartsock, D. L. "Partially Stabilized Zirconia Piston Bowl Reliability." Journal of Engineering for Gas Turbines and Power 109, no. 4 (1987): 367–73. http://dx.doi.org/10.1115/1.3240050.

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The Weibull based “Simplified Structural Ceramic Design Technique” [1] was used to calculate the reliability of a partially stabilized zirconia (PSZ) piston bowl design. The details of the method and a set of sample calculations are presented. Test results of the piston bowl showed cracks in regions which had a high calculated probability of failure. In addition cracks developed in a region of high compressive/shear stress. Since Weibull reliability analysis only uses tensile stresses this area did not have a high calculated probability of failure. Several hypotheses are presented for the mode

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23

Prasad, Ravindra, and N. K. Samria. "Investigation of heat transfer in an oil cooled piston with and without ceramic insulation on crown face." International Journal of Mechanical Sciences 31, no. 10 (1989): 765–77. http://dx.doi.org/10.1016/0020-7403(89)90043-x.

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24

Cho, H. Y., H. Y. Won, H. C. Choe, and M. K. Son. "Fracture Characteristics of Dental Ceramic Crown according to Zirconia Coping Design." Procedia Engineering 10 (2011): 1561–66. http://dx.doi.org/10.1016/j.proeng.2011.04.261.

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25

Francis, L. F., K. J. Vaidya, H. Y. Huang, and W. D. Wolf. "Design and processing of ceramic-based analogs to the dental crown." Materials Science and Engineering: C 3, no. 2 (1995): 63–74. http://dx.doi.org/10.1016/0928-4931(95)00088-7.

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26

El-Sherif, Moustafa, and Richard Jacobi. "The ceramic reverse three-quarter crown for anterior teeth: Preparation design." Journal of Prosthetic Dentistry 61, no. 1 (1989): 4–6. http://dx.doi.org/10.1016/0022-3913(89)90097-8.

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27

Abramchuk, Fedor I., and Andrey N. Avramenko. "Prospects of Using Steel Pistons in Transport Diesel Engines." Periodica Polytechnica Transportation Engineering 48, no. 2 (2019): 196–202. http://dx.doi.org/10.3311/pptr.12466.

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The results of comparative design research in the thermal stress and strain state of the piston in transport diesel engine 2 F 10.5/12 are given for its rated power operation. The standard piston is made of an aluminium alloy, and the modernized one, of steel. Piston thermal profiling and indicator test results were used for identifying the mathematical models and refining the boundary conditions for mechanics and heat conduction problems. To ensure reliable heat rejection from the piston, the paper considered the case of oil jet cooling. This was taken into account when describing the boundar

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Swati, Sikka, R. Chowdhary, and P. S. Patil. "Marginal Strength of Collarless Metal Ceramic Crown." International Journal of Dentistry 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/521470.

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Metal ceramic restorations have been implicated for the discoloration in area of labiogingivalmargin. Attempts to rectify this, by altering the design of metal frameworkswill lead to decrease in fracture strength atmargin. This in vitro study compared the fracture strength at margins of metal ceramic crowns cemented to metal tooth analogs. Crowns evaluated with different marginal configurations, shoulder and shoulder bevel with 0 mm, 0.5 mm, 1 mm, and 1.5 mm, were selected.Methods. Maxillary right canine typhodont tooth was prepared to receive a metal ceramic crown with shoulder margin. This w

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Mirkovic, Nemanja, Aleksandra Spadijer-Gostovic, Zoran Lazic, and Branka Trifkovic. "Fracture toughness of zirconia ceramic crowns made by feather-edge tooth preparation design." Vojnosanitetski pregled 69, no. 7 (2012): 562–68. http://dx.doi.org/10.2298/vsp100820004m.

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Background/Aim. Fracture toughness determines functional crown strenght and prevents damages on ceramics during mastication. There is a lack of relevant literature data about fracture toughness of crowns made by feather-edge preparation. Mechanical testing of ceramic samples is supposed to show if feather-edge tooth preparation is a successful method for making ceramic crowns without any risk of reduction of their mechanical properties. This research was done to establish effects of feather-edge tooth preparation on fracture toughness of single zirconia ceramic crowns. Methods. The research wa

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Konnov, V. V., M. R. Harutyunyan, M. V. Vorobieva, A. S. Khodorich, R. N. Mukhamedov, and D. A. Domenyuk. "Clinical efficiency of orthopedic treatment of dental defects by arc prostheses with polyoxymethylene frame." Medical alphabet, no. 3 (June 12, 2020): 29–34. http://dx.doi.org/10.33667/2078-5631-2020-3-29-34.

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Currently, manufacturing techniques for removable orthopedic structures made of thermoplastic materials are widely used.Objective. To determine the clinical effectiveness of orthopedic treatment of dentition defects with arch prostheses with a framework made of polyoxymethylene using a modified design of supporting metal-ceramic crowns. Using clinical methods, 76 patients with defects in the dentition were examined, who underwent orthopedic treatment with arch prostheses with a frame made of metal and polyoxymethylene. As a result of the study, the clinical efficacy of using the proposed desig

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31

Ramírez-Sebastià, A., T. Bortolotto, M. Roig, and I. Krejci. "Composite vs Ceramic Computer-aided Design/Computer-assisted Manufacturing Crowns in Endodontically Treated Teeth: Analysis of Marginal Adaptation." Operative Dentistry 38, no. 6 (2013): 663–73. http://dx.doi.org/10.2341/12-208-l.

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SUMMARY Objectives To compare the marginal adaptation between ceramic and composite CEREC crowns in endodontically treated teeth restored with endocrowns or with a short or a long post. Methodology Forty-eight intact maxillary incisors were used. After endodontic treatment, the crowns were sectioned 2 mm coronally to the cemento-enamel junction, which provided a ferrule of 2 mm. The prepared teeth were divided randomly into six groups (n=8). Group 1 was restored with a large fiberglass post, composite core, and ceramic full-coverage computer-aided design/computer-assisted manufacturing (CAD-CA

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Raposo, LH, PS Borella, DC Ferraz, LM Pereira, MS Prudente, and PC Santos-Filho. "Influence of Computer-aided Design/Computer-aided Manufacturing Diamond Bur Wear on Marginal Misfit of Two Lithium Disilicate Ceramic Systems." Operative Dentistry 45, no. 4 (2019): 416–25. http://dx.doi.org/10.2341/19-089-l.

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Clinical Relevance Marginal misfit of monolithic lithium disilicate ceramic crowns obtained from a chairside computer-aided design/computer-aided manufacturing system is affected after successive millings using a single diamond bur set. This fact can be critical for the longevity of indirect restorations. SUMMARY Objectives: This laboratory study aimed to assess the effect of successive crown millings on the marginal misfit of monolithic full-ceramic restorations obtained from two lithium disilicate systems, with a single diamond bur set used for each material in a chairside computer-aided des

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McGill, ST, and JR Holmes. "The 7/8 Crown: A Lost Art." Operative Dentistry 37, no. 5 (2012): 453–57. http://dx.doi.org/10.2341/11-402-t.

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SUMMARY Historically, the longevity of teeth restored with gold inlays, onlays, crowns, and partial veneer restorations is excellent. However, in-office computer-aided design and computer-aided manufacturing restorations, laboratory-constructed all-ceramic bonded restorations, and conventional ceramo-metal restorations are more common. The high price of gold, the difficulty of the preparation, and the fact that most dental schools are de-emphasizing the teaching of partial veneer restorations has created a situation whereby the 7/8 crown is rarely viewed as the treatment of choice. Time and ex

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Atkinson, H. V., and P. J. Ward. "Thixoforming of Hypereutectic Al/Si Automotive Pistons." Solid State Phenomena 141-143 (July 2008): 201–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.201.

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For hypereutectic Al/Si alloys, one of the advantages of thixoforming in comparison with casting routes is the relatively short processing times at high temperatures and hence limited coarsening of the Si phase. Coarse silicon particles give poor mechanical properties. Here two hypereutectic Al/Si alloys (magneto-hydro-dynamically (MHD) stirred A390 from Pechiney and an extruded A390 alloy from Showa in Japan) have been thixoformed to form pistons. Opening up the die entrance to the full width of the crown made the flow into the die more uniform and helped to reduce the tendency for large pore

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Rinke, Sven, Anne-Kathrin Pabel, Matthias Rödiger, and Dirk Ziebolz. "Chairside Fabrication of an All-Ceramic Partial Crown Using a Zirconia-Reinforced Lithium Silicate Ceramic." Case Reports in Dentistry 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/1354186.

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The chairside fabrication of a monolithic partial crown using a zirconia-reinforced lithium silicate (ZLS) ceramic is described. The fully digitized model-free workflow in a dental practice is possible due to the use of a powder-free intraoral scanner and the computer-aided design/computer-assisted manufacturing (CAD/CAM) of the restorations. The innovative ZLS material offers a singular combination of fracture strength (>370 Mpa), optimum polishing characteristics, and excellent optical properties. Therefore, this ceramic is an interesting alternative material for monolithic restorations p

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TRIBST, João Paulo Mendes, Amanda Maria de Oliveira DAL PIVA, Alexandre Luiz Souto BORGES, and Marco Antonio BOTTINO. "Influence of crown and hybrid abutment ceramic materials on the stress distribution of implant-supported prosthesis." Revista de Odontologia da UNESP 47, no. 3 (2018): 149–54. http://dx.doi.org/10.1590/1807-2577.04218.

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Abstract Introduction A new dental implant-abutment design is available with the possibility of improving aesthetic with no compromise of mechanical strength, using perforated CAD/CAM ceramic blocks. Objective This study evaluated the influence of crown and hybrid abutment ceramic materials combination on the stress distribution of external hexagon implant supported prosthesis. Method Zirconia, lithium disilicate and hybrid ceramic were evaluated, totaling 9 combinations of crown and mesostructure materials. For finite element analysis, a monolithic crown cemented over a hybrid abutment (mesos

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Rekow, D., and V. P. Thompson. "Near-surface damage - a persistent problem in crowns obtained by computer-aided design and manufacturing." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 219, no. 4 (2005): 233–43. http://dx.doi.org/10.1243/095441105x9363.

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Robust dental systems obtained by computer-aided design and manufacture (CAD/CAM) have been introduced and, in parallel, the strength of the ceramic materials used in fabricating dental crowns has improved. Yet all-ceramic crowns suffer from near-surface damage, limiting their clinical success, especially on posterior teeth. Factors directly associated with CAD/CAM fabrication that contribute to the degree of damage include material selection and machining parameters and strategies. However, a number of additional factors also either create new damage modes or exacerbate subcritical damage, po

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Machmud, Edy. "Cervical end preparation design on collarless metal ceramic crown to the decrease of bacterial colony." Dental Journal (Majalah Kedokteran Gigi) 43, no. 3 (2010): 131. http://dx.doi.org/10.20473/j.djmkg.v43.i3.p131-135.

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Background: Cervical end preparation design is an important procedure in fixed partial denture. If the cervical end preparation design is inadequate, dental plaque will easily be formed and this may indicate the beginning of periodontal disease. Purpose: This study was aimed to analyze the effect of cervical end preparation design on collarless metal ceramic crown towards the decrease of bacterium colony number. Methods: This study was quasi-experimental study applying pre and post test on a control group involving 48 subjects with shoulder, bevel shoulder, and deep chamfer cervical end prepar

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Badran, Noha, Sanaa Abdel Kader, and Fayza Alabbassy. "Effect of Incisal Porcelain Veneering Thickness on the Fracture Resistance of CAD/CAM Zirconia All-Ceramic Anterior Crowns." International Journal of Dentistry 2019 (August 26, 2019): 1–12. http://dx.doi.org/10.1155/2019/6548519.

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Statement of Problem. In some clinical situations, the vertical length of either a prepared tooth or an implant abutment is short, while the occlusal clearance to be restored by a porcelain crown is large. Incisal thickness of the veneering porcelain should be considered to prevent mechanical failure of the crown. Purpose. The aim of this study is to evaluate the effect of two different incisal veneering porcelain thickness on the fracture resistance of the anterior all-ceramic CAD/CAM zirconia crown system as compared with the conventionally used metal ceramic crown system. Method. CAD/CAM zi

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Vittal, M., J. A. Borek, D. A. Marks, A. L. Boehman, D. A. Okrent, and A. P. Bentz. "The Effects of Thermal Barrier Coatings on Diesel Engine Emissions." Journal of Engineering for Gas Turbines and Power 121, no. 2 (1999): 218–25. http://dx.doi.org/10.1115/1.2817108.

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This study has characterized the influence of thermal barrier coatings (TBCs) applied to combustion chamber surfaces on the emissions from an indirect injection (IDI) diesel engine. The TBCs were applied to the piston crown, the cylinder head (fire deck) and the valves of a single cylinder Yanmar TS-180 IDI diesel utility engine. The gaseous and particulate emissions from the baseline (uncoated) and ceramic-coated engine were analyzed to assess the changes in the combustion process caused by the coatings. The results of these analyses show two clear trends during operation of the baseline and

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Lee, Kunhee, Keunbada Son, and Kyu-bok Lee. "Effects of Trueness and Surface Microhardness on the Fitness of Ceramic Crowns." Applied Sciences 10, no. 5 (2020): 1858. http://dx.doi.org/10.3390/app10051858.

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This study aims to evaluate the fitness, surface microhardness, and trueness of crowns fabricated from three types of dental ceramic blocks (HASS Rosetta, IPS e.max CAD, and VITA Suprinity) and analyze the correlations between them. A crown was first designed in computer-aided design (CAD) software. To create a crown designed model (CDM), the design file was extracted from the CAD software, and a lithium disilicate block was processed from the file with a milling machine. To create a crown scanned model (CSM), the inside of the fabricated crown was digitized using a contact scanner. Using thre

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Thirunavukkarasu, R., A. Vadivel, and R. Prakash. "Investigation of Performance and Emission Characteristics of VCR Engine by Using Ceramic Coating on the Piston Crown with Using Methanol Fuel." Applied Mechanics and Materials 854 (October 2016): 101–8. http://dx.doi.org/10.4028/www.scientific.net/amm.854.101.

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The world faces the energy demand, exaggerated crude rates and reduce of fuel resources. Methanol has been considered as an alternate fuel. . The current study takes out an experiment of using methanol in VCR engine. They are blended with diesel at various mixing ratios. The results of methyl alcohol works in engine were checked in an exceedingly single cylinder, direct injection, water cooled and high speed VCR internal combustion engine at varied engine load with constant engine speed of 1500rpm conjointly we tend to mistreatment the limit coated piston with MgO-ZrO2 and Al2O3-13%TiO2 to inv

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Aravindha Balaji, S., S. Lakshmana kumar, and S. N. Saranya. "Study of combustion characteristics on single cylinder direct injection diesel engine with plasma and HVOF coated ceramic powders on piston crown." Materials Today: Proceedings 33 (2020): 989–94. http://dx.doi.org/10.1016/j.matpr.2020.07.043.

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Dattatreya, V., B. R. Ramesh Bapu, and B. Durga Prasad. "Study of Combustion Characteristics on Single Cylinder Direct Injection Diesel Engine with Plasma and HVOF Coated Ceramic Powders on Piston Crown." Materials Today: Proceedings 16 (2019): 621–28. http://dx.doi.org/10.1016/j.matpr.2019.05.137.

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Demir, Necla, Atiye Nilgun Ozturk, and Meral Arslan Malkoc. "Evaluation of the marginal fit of full ceramic crowns by the microcomputed tomography (micro-CT) technique." European Journal of Dentistry 08, no. 04 (2014): 437–44. http://dx.doi.org/10.4103/1305-7456.143612.

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ABSTRACT Objective: To evaluate the marginal gap (MG) and absolute marginal discrepancy (MD) of full ceramic crowns with two finish line designs, shoulder and chamfer, using microcomputed tomography (micro-CT) before and after cementation. Materials and Methods: Sixty extracted human maxillary premolar teeth were divided into two groups based on the finish line design: Group I: 90° shoulder and Group II: 135° chamfer. The specimens were further grouped based on the type of full ceramic crown they received: Group A: Feldspathic Cerec inLab ceramic system, Group B: Cerec inLab aluminum oxide cer

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Ozer, Zafer, Cem Kurtoglu, Amirullah M. Mamedov, and Ekmel Ozbay. "Influence of Crown Margin Design on the Stress Distribution in Maxillary Canine Restored by All-Ceramic Crown: A Finite Element Analysis." Journal of Korean Dental Science 8, no. 1 (2015): 28–35. http://dx.doi.org/10.5856/jkds.2015.8.1.28.

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Lin, Chun-Li, and Che An Pai. "NUMERICAL INVESTIGATION OF FAILURE RISK OF CAD/CAM CERAMIC RESTORATION FOR AN ENDODONTICALLY TREATED MAXILLARY PREMOLAR WITH MO PREPARATION." Biomedical Engineering: Applications, Basis and Communications 22, no. 04 (2010): 327–35. http://dx.doi.org/10.4015/s1016237210002043.

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This study evaluates the risk of failure for an endodontically treated premolar with mesio-occlosal (MO) preparation and four different computer-aided design/manufacturing (CAD/CAM) ceramic restoration configurations. Four three-dimensional finite element (FE) models designed with CAD/CAM ceramic inlay, endoinlay, endocrown, and classical crown restorations were constructed to perform simulations. The Weibull function was incorporated with an FE analysis to calculate the long-term failure probability relative to different load conditions. The results indicated that the stress values on the ena

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Vlahova, Angelina. "Preparation Junctions for All-Ceramic CAD/CAM Crown and Bridge Restorations." Balkan Journal of Dental Medicine 20, no. 2 (2016): 122–25. http://dx.doi.org/10.1515/bjdm-2016-0020.

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Summary Background: The preparation junction type is determined by a number of factors that need to be taken in consideration with CAD/CAM Fixed Prosthodontics: the used material; the condition of the retainer teeth, their periodontium and the occlusion; the design software and the type of drills; the working protocol; the cement and the method of cementation.The aim: of this article is to describe the optimal preparation junctions for CAD/CAM crown and bridge restorations made by ceramics based on zirconium dioxide and the basic factors that affect them.Materials and methods: Chamfer and radi

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Wang, Yi, Limin Wu, Shuo Liu, Mei Li, and Yi Cui. "Fretting fatigue optimization of piston skirt top surface of marine diesel engine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 4 (2018): 1453–69. http://dx.doi.org/10.1177/0954406218771723.

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Composite pistons are often used in highly rated marine diesel engines. Fretting usually occurs on the mating surfaces of piston crown and skirt due to alternating loads. A finite element contact model is introduced to calculate the temperature and stress distribution in the composite piston of a marine diesel engine. The Archard model and Smith–Watson–Topper parameter (a prediction parameter of fretting fatigue, also called SWT parameter for short), which is used as fretting wear and fatigue criteria, are calculated according to the stress and strain variation and relative slip on the contact

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Rajashekhar, C. R., C. Umashankar, T. K. Chandrashekar, and P. Naveen. "The Effect of Titanium Oxide Content in Piston Coating on the Performance and Emission Characteristics of Bio-Diesel Fuelled C.I. Engine." Advanced Materials Research 795 (September 2013): 24–28. http://dx.doi.org/10.4028/www.scientific.net/amr.795.24.

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Thermal barrier coating has proven to be effective in improving the thermal efficiency and initiation of an effective cooling system of the engine. In the present work the engine piston crown was plasma coated with 150μm thicknss of catalytic ceramic material Alumina-Titanium oxide (Al2O3-TiO2) over a 60μm thickness of NiCrAl bond coat. Available literature on this topic suggest that the particular effect of TiO2 on the over all thermal barrier characteristics have not been established clearly. It was therefore felt that the effect of weight percentage of TiO2 in the Al2O3-TiO2, might influenc

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