The effects of calcium hydroxide on dentin permeability.
Calcium hydroxide paste was applied to human dentin in vitro to determine its effects on dentin permeability. Discs of dentin were acid-etched on both sides to permit determination of their maximum permeability. Smear layers were then applied to the enamel sides of the discs, thereby reducing dentin permeability 99%. Topical application of Ca(OH)2 paste to the smear layer reduced dentin permeability further, to levels 48% below that of untreated smear layers. When the Ca(OH)2-treated smear layers were exposed to 6% citric acid for two min, dentin permeability returned to the initial acid-etched value, demonstrating that Ca(OH)2 offers little protection to acid challenge. Treatment of acid-etched dentin with Ca(OH)2 produced a similar reduction in dentin permeability, which was restored to normal following acid challenge. Thus, Ca(OH)2 is effective at reducing the permeability of both the smear layer and of acid-etched dentin, in vitro.
Pashley
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Kalathoor
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Burnham
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D000134:Acid Etching, Dental; D002126:Calcium Hydroxide / Q000008:administration & dosage / Q000494:pharmacology*; D002951:Citrates / Q000494:pharmacology; D019343:Citric Acid; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D003806:Dentin Permeability / Q000187:drug effects*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D009824:Ointments; D014088:Tooth Permeability / Q000187:drug effects*
D002951:Citrates; D009824:Ointments; D019343:Citric Acid; D002126:Calcium Hydroxide