Radicular peroxide penetration from carbamide peroxide gels during intracoronal bleaching

Abstract

Peroxide penetration of CP gels was significantly lower than that of a HP-SP mixture.

The Effects of Antioxidant Application and Time Factor on Fiber Post Bonding to Root Dentin after Intracoronal Bleaching

“…Its effectiveness depends mainly on the chemical oxidation process (22); however, the oxidizing agents can reduce the adhesion of the resin materials to the dentin (1). Gökay et al reported the radicular peroxide penetration from CP during an intracoronal bleaching procedure (18). The results showed that the root dentin's peroxide penetration may reduce the bonding strength of the fiber posts to the canal walls.…”

“…It can be argued that the oxygen radicals might penetrate deeper into the root regions when the lower bonding strengths of the fiber posts cemented immediately after the bleaching process are taken into account. In the literature, it has been shown that the oxygen radicals can penetrate into the dentin tubules (18). Additionally, one previous study reported that the glass-ionomer cement, which acts as a barrier, may not prevent the leakage of the bleaching agent (19).…”

“…Therefore, resin cements are used to improve the adaptation of the circular posts to the canal walls. In the literature, the radicular peroxide penetration from carbamide peroxide gels applied during intracoronal bleaching has been shown (18). In addition, glassionomer cements, which are used as a protective barrier, may not prevent the leakage of bleaching agents; thus, the bonding strength of the fiber post may decrease (19).…”

Cytotoxicity of non-vital dental bleaching agents in human gingival fibroblasts

“…The hydrogen peroxide that is the main component of all bleaching agents, can diffuse through dentin and cementum and reaches periodontal tissues [5,19,20], causing damage effects from mild inflammation to external cervical root resorption [6].…”

“…Tooth permeability to bleaching agents occurs due to its low molecular weight and the ability of denature proteins, allowing the penetration of hydrogen peroxide to the pulp chamber and periodontal tissue [4,5]. Several authors reported that bleaching agents can penetrate in the dentinal tubules and initiated an inflammatory process which might promote a cervical external root resorption [6] after non-vital dental bleaching in teeth with or without defects in the cementumenamel junction [7,8].…”