Final answer:
A round bur is used to remove caries during tooth preparation, allowing for the removal of decayed tissue and enabling restoration of the tooth.
Step-by-step explanation:
The type of bur used to remove caries during tooth preparation is a round bur. Round burs are used to remove decayed tissue and create access for further tooth preparation. By using a round bur, dental professionals are able to effectively treat smaller areas of decay before restoring the tooth with a filling. Other burs, such as the inverted cone bur, tapered fissure bur, and diamond bur, have specific uses in shaping the tooth structure but are not primarily used for caries removal.