blood catecholamine levels were determined by high-performance liquid chromatography after placement of the cord around two teeth in a random sequence of the following treatments : ( 1 ) untreated cord to intact gingival crevice ( c ) , ( 2 ) epinephrine cord to intact crevice ( e1 ) , and ( 3 ) epinephrine cord to a crevice disrupted with a tapered diamond bur to simulate a subgingival procedure such as in crown preparation ( e2 ) .
C0087111
treatments
C0184661
procedure