Final answer:
A conical shaped bur with a slight taper is used to create the divergence necessary for an inlay Class II preparation. This ensures a proper fit and retention of the inlay.
Step-by-step explanation:
In dentistry, particularly for an inlay Class II preparation a conical shaped bur with a slight taper is commonly used to create the required divergence. This type of bur is designed to enlarge the cavity towards the occlusal surface ensuring that the inlay will properly fit and be retained in the cavity.
The use of a tapered bur allows for a gradual transition from the narrower part of the cavity near the gingiva to the wider part near the occlusal surface which is essential for the success of the inlay restoration.