Access burs through the crown-endodontics principles, Biology

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Access burs through the crown:

Carbide fissure burs : cut through metal ( amalgam alloy or cast metal ) or composite resin.

Porcelain fused to metal :

-A round diamond is used to cut through the porcelain layer
-Transmetal bur to cut through metal
-transmetal bur has several blades to cut metal properly.
-Porcelain jacket crown :
-Diamond bur with copious coolant water spray to minimize micro fractures

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