1700
In this study , we have fabricated porous Ta and Ti6Al4V ( Ti64 ) implants using laser engineered net shaping ( LENS™ ) with similar volume fraction porosity to compare the influence of surface characteristics and material chemistry on in vivo response using a rat distal femur model for 5 and 12 weeks .
 concept or principle: fabricated; material: Ta; material: Ti6Al4V; material: Ti64; application: implants; manufacturing process: laser engineered net shaping; process parameter: volume fraction; machanical property: porosity; concept or principle: surface; material: material; concept or principle: chemistry; concept or principle: model
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: fabricated, Ta, Ti6Al4V, Ti64, implants, laser engineered net shaping, volume fraction, porosity, surface, material, chemistry, model 
Answer:
 concept or principle: fabricated; material: Ta; material: Ti6Al4V; material: Ti64; application: implants; manufacturing process: laser engineered net shaping; process parameter: volume fraction; machanical property: porosity; concept or principle: surface; material: material; concept or principle: chemistry; concept or principle: model