643
Therefore , attempts were made either to develop surface modification techniques or to use substitution elements to mitigate this effect without sacrificing the biocompatibility .
 manufacturing process: surface modification; material: elements; machanical property: biocompatibility
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:
 manufacturing process: surface modification; material: elements; machanical property: biocompatibility