500
For instance , more bone ingrowth was found in porous titanium coatings of higher porosity after the implants were placed into a canine model for 8 weeks .
 concept or principle: bone ingrowth; machanical property: porous; application: coatings; machanical property: porosity; application: implants; application: canine model
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: bone ingrowth; machanical property: porous; application: coatings; machanical property: porosity; application: implants; application: canine model