Which type (#)of bur helps to provide angles to the walls of the cavity preparation with retention grooves?

Question

Quizplus · Accepted Answer

A tapered fissure cross-cut bur,numbers 699-703,is used to provide angles to the walls of the cavity preparation with retention grooves.
Number 4,a round bur,gains entrance into the tooth.
Number 56,a straight fissure plain cut bur,forms internal walls of cavity preparation.
Number 330,a pear bur,extends the cavity preparation.

Which Type (#)Of Bur Helps to Provide Angles to the Walls