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These tools are generally used in the manufacture of dental pieces in machining centers , where extra material is removed from a block to obtain the piece with the desired shape .
 machine or equipment: tools; concept or principle: manufacture; machine or equipment: dental pieces; machine or equipment: machining centers; material: material
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:
 machine or equipment: tools; concept or principle: manufacture; machine or equipment: dental pieces; machine or equipment: machining centers; material: material