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Dental ceramic pieces made by direct ink deposition still present low mechanical properties , compared to other conventional means to produce molded parts .
 material: Dental ceramic pieces; manufacturing process: direct ink deposition; concept or principle: mechanical properties
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:
 material: Dental ceramic pieces; manufacturing process: direct ink deposition; concept or principle: mechanical properties