6221
We have proposed a model for the elementary polymerization volume ( voxel ) formation for the introduced case and carried out simulations to examine the influence of the refractive indexes relation , layer thickness , roughness , and polymerization depth on the polymerization performance .
 model, polymerization, voxel, simulations, layer thickness, roughness, polymerization, polymerization, performance
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 model, polymerization, voxel, simulations, layer thickness, roughness, polymerization, polymerization, performance