Permeability of different groups of maxillary teeth after 38% hydrogen peroxide internal bleaching.
This study evaluated the influence of internal tooth bleaching with 38% hydrogen peroxide (H2O2) on the permeability of the coronal dentin in maxillary anterior teeth and premolars. Seventy teeth (14 per group) were used: central incisors (CI), lateral incisor (LI), canines (C), first premolars (1PM) and second premolars (2PM). Pulp chamber access and transversal sectioning at 2 mm from the cementoenamel junction were performed and the specimens were divided into 2 groups (n= 7): a) no treatment and b) bleaching with 38% H2O2. The bleaching agent was applied to the buccal surface and to the pulp chamber for 10 min. This procedure was repeated 3 times. The specimens were processed histochemically with copper sulfate and rubeanic acid, sectioned longitudinally, and digitalized in a scanner. The area of stained dentin was measured using Image Tool software. Data were analyzed statistically by ANOVA and Tukey's HSD test (alpha=0.05). There was statistically significant difference (p<0.001) among the untreated groups, CI (0.23 +/- 0.26) having the lowest permeability and LI (10.14 +/- 1.89) the highest permeability. Among the bleached groups, dentin permeability was increased in all groups of teeth except for 2PM. It may be concluded that bleaching with 38% H2O2 affected dentin permeability near the pulp chamber in maxillary anterior teeth and in first and second premolars.
Rodrigues
Lívia Maria
LM
Department of Endodontics, Dental School, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
Vansan
Luis Pascoal
LP
Pécora
Jesus Djalma
JD
Marchesan
Melissa Andréia
MA
D004396:Coloring Agents / Q000494:pharmacology; D003300:Copper / Q000494:pharmacology; D003745:Dental Enamel Permeability / Q000187:drug effects; D003786:Dental Pulp Cavity / Q000187:drug effects*; D003806:Dentin Permeability / Q000187:drug effects*; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D008437:Maxilla; D016877:Oxidants / Q000494:pharmacology; D012388:Root Canal Irrigants / Q000494:pharmacology*; D014073:Tooth Bleaching / Q000379:methods*; D019553:Tooth, Nonvital
D004396:Coloring Agents; D016877:Oxidants; D012388:Root Canal Irrigants; D003300:Copper; D006861:Hydrogen Peroxide