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However , there are still concerns about application of AM to ceramics due to their intrinsically poor mechanical properties , the accuracy of the obtained pieces , their density and surface finishing .
 manufacturing process: AM; material: ceramics; concept or principle: mechanical properties; process characterization: accuracy; machanical property: density; manufacturing process: surface finishing
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:
 manufacturing process: AM; material: ceramics; concept or principle: mechanical properties; process characterization: accuracy; machanical property: density; manufacturing process: surface finishing