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An interesting approach , when printing 3D complex dental ceramic structures , could be to combine the best attributes of AM technologies with conventional surface finishing methods .
 concept or principle: 3D; material: dental ceramic structures; material: be; manufacturing process: AM technologies; manufacturing process: conventional surface finishing methods
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: 3D; material: dental ceramic structures; material: be; manufacturing process: AM technologies; manufacturing process: conventional surface finishing methods