I agree with the other posters with regard to using 330 bur or 1557 burs. 330 is my preference as it provides ideal minimal depth for the materials in non carious areas of the occlusal prep.
However, in the cervical areas, a round bur is perfectly fine for depth and caries removal. In fact , use of the round bur on the gingival floor of class V will provide a slight retentive undercut which is always helpful in preventing dislodgment. Shallow class V might require additional depth and retentive undercuts after round bur excavation with inverted cone burs.
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