I. Rotstein, ROLE OF CATALASE IN THE ELIMINATION OF RESIDUAL HYDROGEN-PEROXIDE FOLLOWING TOOTH BLEACHING, Journal of endodontics, 19(11), 1993, pp. 567-569
Hydrogen peroxide at high concentrations may cause damage to the tooth
structure and to the surrounding periodontal tissues. The efficacy of
catalase applied following intracoronal bleaching to eliminate residu
al hydrogen peroxide was examined and compared with prolonged water ri
nses. Extracted human premolars were treated endodontically and bleach
ed with 30% hydrogen peroxide. Upon completion of the bleaching proced
ure, the teeth were treated with either catalase or water. Radicular h
ydrogen peroxide penetration was measured immediately after bleaching
and following each catalase and/or water rinse. A correlation between
the number of water rinses and the reduction in the radicular hydrogen
peroxide penetration was found. Three cycles of 5-min water rinses an
d 1-h immersion of the teeth in water significantly reduced the residu
al hydrogen peroxide penetration. One treatment with catalase applied
for 3 min totally eliminated the residual hydrogen peroxide. It is the
refore suggested that catalase be used as an adjunct following intraco
ronal bleaching of nonvital teeth to effectively eliminate the residua
l hydrogen peroxide from the pulp chamber and from the surrounding per
iodontal tissues.