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Effect of Smear Layer on Root Demineralization Adjacent to Resin-modified Glass Ionomer

¹ Dows Institute for Dental Research, College of Dentistry N413, and
² Department of Biostatistics, College of Public Health, The University of Iowa, Iowa City, IA 52242-1010;

View larger version (135K): [in a new window]   Figure 1. SEM photomicrographs of dentin surface morphology resulting from different cavity surface treatments. (A) The smear layer is removed from intertubular dentin, but partially or completely occluded dentinal tubules are found in the PAA-treated group. (B) Total removal of the smear layer and smear plugs by H3PO4, left open, and funnel-shaped dentinal tubules.

View larger version (53K): [in a new window]   Figure 2. PLM photomicrographs of sections soaked in water (L, lesion; D, dentin; R, restoration; IZ, inhibition zone). (A) Section from a tooth that received no cavity surface treatment. Note that no inhibition zone or wall lesion formation was found on the root adjacent to the gingival margin of the restoration. (B) A relatively small inhibition zone formed on the root adjacent to the margin in a tooth treated with PAA. (C) Large inhibition zone formed on the root adjacent to the margin in a tooth treated with H3PO4.

View larger version (13K): [in a new window]   Figure 3. Dentin fluoride profiles obtained at 10-µm intervals perpendicularly from the cavity gingival wall. Each spot represents the mean of three measurements of fluoride concentration ± SD (error bar). More fluoride uptake with phosphoric acid cavity surface treatment compared with other cavity surface treatments can be noted.