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A tapered fissure bur-plain cut is characterized by its sides that taper inward towards the cutting edge, which allows it to create precise angles and shapes in cavity preparation. This design facilitates the cutting of walls that converge, making it useful for specific procedures where a certain degree of taper is necessary for effective tooth preparation or for fitting restorations.
In contrast, a straight fissure bur features parallel sides, which means that it maintains the same width from the handle to the cutting tip. This type of bur is often used for cutting straight walls in cavity preparations but does not provide the angle needed for certain types of retention in restorative procedures.
The tapered sides of the bur play a critical role when preparing teeth for certain types of restorations, as the taper helps ensure that the restoration locks into place by creating an optimal interface between the tooth structure and the material used. Thus, the distinction in the design of the bur reflects its intended use in dental procedures.