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specific mechanical properties , different degrees of porosity and/or density , biodegradability , osteointegration and cytotoxicity .
 concept or principle: mechanical properties; process characterization: degrees of porosity; machanical property: density; machanical property: biodegradability; machanical property: osteointegration; machanical property: cytotoxicity
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: mechanical properties; process characterization: degrees of porosity; machanical property: density; machanical property: biodegradability; machanical property: osteointegration; machanical property: cytotoxicity