1917
For example , it was shown that a higher corrosion resistance of Co-Cr dental alloy was obtained by Selective Laser Melting in comparison with the Selective Laser Sintering process , due to a passive oxide protecting layer which formed on the surface of the SLM sample .
 concept or principle: corrosion resistance; material: Co-Cr dental alloy; manufacturing process: Selective Laser Melting; manufacturing process: Selective Laser Sintering process; material: oxide; process parameter: layer; concept or principle: surface; manufacturing process: SLM; concept or principle: sample
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: corrosion resistance; material: Co-Cr dental alloy; manufacturing process: Selective Laser Melting; manufacturing process: Selective Laser Sintering process; material: oxide; process parameter: layer; concept or principle: surface; manufacturing process: SLM; concept or principle: sample