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Influence of acid etching on hydrogen peroxide diffusion through human dentin
Jean Camps1, Ludovic Pommel, Virginie Aubut
1Laboratory IMEB, Faculty of Odontology, Université de la Méditerranée, Marseille, France. Jcamps2035@aol.com
Purpose:
To evaluate the influence of dentin etching with phosphoric acid on hydrogen peroxide diffusion through human dentin in internal bleaching.
Methods:
46 human premolars were extracted for orthodontic reasons from adolescents. The teeth were endodontically treated and a flat defect was created at the enamel-cementum junction. The teeth were divided into two groups: the access cavity was etched for 30 seconds with 35% H3PO4 in the first group and left intact in the second group. The teeth were filled with 20 microL of 35% hydrogen peroxide gel. The receiving medium on the other side was renewed at Day 1, Day 2 and Day 7 to quantify the diffusing hydrogen peroxide. An analysis of variance was performed to compare the diffusion between the two groups.
Results:
This work demonstrated a higher hydrogen peroxide diffusion when the access cavity was etched (P < 0.01).
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