E. Koulaouzidou et al., ROLE OF CEMENTOENAMEL JUNCTION ON THE RADICULAR PENETRATION OF 30-PERCENT HYDROGEN-PEROXIDE DURING INTRACORONAL BLEACHING IN-VITRO, Endodontics & dental traumatology, 12(3), 1996, pp. 146-150
Intracoronal bleaching of nonvital teeth with 30% hydrogen peroxide is
occasionally associated with external cervical root resorption. The e
xact mechanism by which bleaching induced root resorption occurs is no
t yet fully understood. The relationship of cementum to the enamel at
the cementoenamel junction may have clinical significance. Seventeen s
ingle rooted human mandibular premolars extracted atraumatically for o
rthodontic reasons were used. The radicular hydrogen peroxide penetrat
ion in each tooth was measured in vitro by an indirect colorimetric me
thod. Thereafter, the teeth were examined with a scanning electron mic
roscope to determine the type of the cementoenamel junction. It was fo
und that the radicular penetration of 30% hydrogen peroxide was relate
d to the type of cementoenamel junction.