Using a "77B" or 'Cup bur' (6 photos)

 This bur has two names, each of them are doing the same process in finishing. The first name is "77B" bur and the other is a "Cup Bur". Both names are 100% acceptable when ordering new burs.

 In this photo you can see the range of sizes in one box. You never know which bure to buy, so why not buy a 'sample' bur packet? I've done this more than once in my history of bur buying.

 If you look closely you will find an edge that does nothing while its being rotated for rounding off the claw tips.

 In this second photo of the same cup bur you can see the teeth of this bur being exposed. How do you manage to do this? I have the answer in this essay.

 All claw tips of every size have problems in making the claws rounded. There are two techniques in fixing this problem.

 The first is to gently round off the tips prior to the stone setting. The next step is to round them off AFTER THE STONE SETTING.

 

 The 'bur modification' is so easy my grand-daughter can do this for herself. Put the bur into the handpiece and activate the rotating bur. What you are doing is basically REMOVING THAT  UNUSED EDGE OF STEEL.

 I always use a 'low viscosity' oil and let the rotating bur be trimmed. The rotating bur is held at 45 degree.