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Moreover , there is currently no general approach and agreement about preferred roughness values or surface micron-scale features and pore size for effective bone cell growth and functioning of implants .
 machanical property: roughness values; concept or principle: surface; engineering feature: micron-scale; process parameter: pore size; biomedical: bone cell; application: implants
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:
 machanical property: roughness values; concept or principle: surface; engineering feature: micron-scale; process parameter: pore size; biomedical: bone cell; application: implants