Marginal fit of metal-ceramic crowns fabricated by using a casting and two selective laser melting processes before and after ceramic firing

2019 ◽  
Vol 122 (5) ◽  
pp. 475-481 ◽  
Author(s):  
Min-Ho Hong ◽  
Bong Ki Min ◽  
Du-Hyeong Lee ◽  
Tae-Yub Kwon
Keyword(s):  
Selective Laser Melting ◽  
Laser Melting ◽  
Marginal Fit ◽  
Metal Ceramic ◽  
Before And After ◽  
Ceramic Crowns

Marginal Fit Metal–Ceramic and In-Ceram Single Crown Cement retained in Implant-supported Abutments

2016 ◽  
Vol 17 (12) ◽  
pp. 969-972
Author(s):  
Rudys Rodolfo de Jesus Tavarez ◽  
Mateus R Tonetto ◽  
EM Maia Filho ◽  
Valdimar S Valente ◽  
Carlos E Francischone ◽  
...  
Keyword(s):  
Clinical Significance ◽  
Zinc Phosphate ◽  
Marginal Fit ◽  
Single Crown ◽  
Implant Abutments ◽  
Metal Ceramic ◽  
Before And After ◽  
Ceramic Crowns ◽  
Group 2 ◽  
Group 1

ABSTRACT Introduction This study evaluated the cervical fit of cemented metal–ceramic and In-Ceram implant-supported crowns, before and after the cementing procedure. Materials and methods Twenty crowns cemented on implant abutments are divided into two groups (n = 10): Group 1 – cemented metal–ceramic crowns and group 2 – cemented In-Ceram crowns. The marginal adaptations before and after cementation were evaluated in a comparison microscope with an error of 1 μm. All crowns were cemented with zinc phosphate cement. Results The cervical misalignment of cemented crowns before cementation (52.65 ± 11.83 and 85.73 ± 14.06 μm) was lower than that after cementation (66.80 ± 15.86 and 89.36 ± 22.66 μm). Conclusion The cementing procedure interferes with the marginal fit of cemented crowns on implant abutments, with the prosthesis having better adaptation before cementation. Cemented metal–ceramic crowns exhibited better cervical adaptation than In-Ceram crowns cemented before and after the cementing procedure. Clinical significance The maintenance of gum health and the longevity of prosthetic restorations are closely related to the restoration's marginal integrity. How to cite this article Valente VS, Francischone CE, Vilarinho Soares de Moura CD, Francischone Júnior CE, Silva AM, Ribeiro IS, Maia Filho EM, Bandéca MC, Tonetto MR, de Jesus Tavarez RR. Marginal Fit Metal–Ceramic and In-Ceram Single Crown Cement retained in Implant-supported Abutments. J Contemp Dent Pract 2016;17(12):969-972.

The Marginal Fit of CAD/CAM Monolithic Ceramic and Metal-Ceramic Crowns

2017 ◽  
Vol 28 (3) ◽  
pp. 299-304 ◽  
Author(s):  
Yolanda Freire ◽  
Esther Gonzalo ◽  
Carlos Lopez-Suarez ◽  
Maria J. Suarez
Keyword(s):  
Marginal Fit ◽  
Metal Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns

Effects of vacuum annealing treatment on microstructures and residual stress of AlSi10Mg parts produced by selective laser melting process

2016 ◽  
Vol 30 (19) ◽  
pp. 1650255 ◽  
Author(s):  
Tian Chen ◽  
Linzhi Wang ◽  
Sheng Tan
Keyword(s):  
Residual Stress ◽  
Tensile Strength ◽  
Selective Laser Melting ◽  
Vacuum Annealing ◽  
Annealing Treatment ◽  
Melting Process ◽  
Second Phase ◽  
Laser Melting ◽  
Heat Treated ◽  
Before And After

Selective laser melting (SLM)-fabricated AlSi10Mg parts were heat-treated under vacuum to eliminate the residual stress. Microstructure evolutions and tensile properties of the SLM-fabricated parts before and after vacuum annealing treatment were studied. The results show that the crystalline structure of SLM-fabricated AlSi10Mg part was not modified after the vacuum annealing treatment. Additionally, the grain refinement had occurred after the vacuum annealing treatment. Moreover, with increasing of the vacuum annealing time, the second phase increased and transformed to spheroidization and coarsening. The SLM-produced parts after vacuum annealing at 300[Formula: see text]C for 2 h had the maximum ultimate tensile strength (UTS), yield strength (YS) and elongation, while the elastic modulus decreased significantly. In addition, the tensile residual stress was found in the as-fabricated AlSi10Mg samples by the microindentation method.

Studying of Microstructure and Properties of Selective Laser Melted Titanium-Based Alloy

2015 ◽  
Vol 1120-1121 ◽  
pp. 1269-1275
Author(s):  
Anatoly A. Popovich ◽  
Vadim Sh. Sufiiarov ◽  
Igor A. Polozov ◽  
Evgenii V. Borisov ◽  
Maxim Y. Maximov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Behavior ◽  
Selective Laser Melting ◽  
Powder Material ◽  
Elevated Temperatures ◽  
Initial Powder ◽  
Laser Melting ◽  
Before And After

The article presents the results of selective laser melting of Ti-6Al-4V alloy. It was studied phase composition and microstructure of the initial powder material, the specimens manufactured by Selective Laser Melting and also the specimens after heat treatment. The effect of heat treatment on microstructure and mechanical properties of the specimens was shown. It was studied the mechanical behavior of the manufactured specimens before and after heat treatment at room and elevated temperatures as well. After heat treatment tests showed that the specimens have decent mechanical properties both at room and elevated temperatures.

scholarly journals Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

2017 ◽  
Vol 62 (2) ◽  
pp. 1341-1346 ◽  
Author(s):  
K.-A. Lee ◽  
Y.-K. Kim ◽  
J.-H. Yu ◽  
S.-H. Park ◽  
M.-C. Kim
Keyword(s):  
Heat Treatment ◽  
Impact Toughness ◽  
Selective Laser Melting ◽  
Impact Energy ◽  
Charpy Impact ◽  
Melting Process ◽  
Laser Melting ◽  
Average Impact ◽  
Before And After ◽  
The Impact

AbstractThis study manufactured Ti-6Al-4V alloy using one of the powder bed fusion 3D-printing processes, selective laser melting, and investigated the effect of heat treatment (650°C/3hrs) on microstructure and impact toughness of the material. Initial microstructural observation identified prior-βgrain along the building direction before and after heat treatment. In addition, the material formed a fully martensite structure before heat treatment, and after heat treatment,αandβphase were formed simultaneously. Charpy impact tests were conducted. The average impact energy measured as 6.0 J before heat treatment, and after heat treatment, the average impact energy increased by approximately 20% to 7.3 J. Fracture surface observation after the impact test showed that both alloys had brittle characteristics on macro levels, but showed ductile fracture characteristics and dimples at micro levels.

scholarly journals Mechanical Properties and Metal-Ceramic Bond Strength of Co-Cr Alloy Manufactured by Selective Laser Melting

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5745
Author(s):  
Joon-Ki Hong ◽  
Seong-Kyun Kim ◽  
Seong-Joo Heo ◽  
Jai-Young Koak
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Yield Strength ◽  
Bond Strength ◽  
Selective Laser Melting ◽  
Laser Melting ◽  
Three Point Bending ◽  
Ceramic Bond ◽  
Metal Ceramic

Cobalt–chromium (Co-Cr) metal is one of the widely used biomaterials in the fabrication of dental prosthesis. The purpose of this study was to investigate whether there are differences in the properties of metals and bond strength with ceramics depending on the manufacturing methods of Co-Cr alloy. Co-Cr alloy specimens were prepared in three different ways: casting, milling, and selective laser melting (SLM). The mechanical properties (elastic modulus, yield strength, and flexural strength) of the alloys were investigated by flexure method in three-point bending mode, and microstructures of the specimens were analyzed. After application of the veneering ceramic through the three-point bending test, bond strength of the Metal-Ceramic was investigated. The cracked surfaces were observed by means of energy dispersive X-ray (EDX) spectroscopy and scanning electron microscopy (SEM) with backscattered electron (BSE) images. In mechanical properties, the elastic modulus was highest for the casting group, and the yield strength and flexural strength were lowest for the milling group. The SLM group showed finer homogeneous crystalline-microstructure, and a layered structure was observed at the fractured surface. After the ceramic bond strength test, all groups showed a mixed failure pattern. The casting group showed the highest bond strengths, whereas there was no significant difference between the other two groups. However, all groups have met the standard of bond strength according to international standards organization (ISO) with the appropriate passing rate. The results of this study indicate that the SLM manufacturing method may have the potential to replace traditional techniques for fabricating dental prosthesis.

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