Abstract
The pH of dentin in teeth with calcium hydroxide and zinc oxide-eugenol filled cavities was studied in freeze-sectioned young monkey's teeth by means of pH indicators. In untreated dental tissues, the range of pH was found to be 6.4 to 7.4, and the same range of pH was observed when the dentin had been covered with zinc oxide-eugenol. Dentin covered by calcium hydroxide showed a pH range of 11.4 to 12.2 one to three days after application. Seven days after application of calcium hydroxide, the dentin nearest the cavity still showed a pH range of 11.4 to 12.2, whereas the pulpal part showed a pH range of 7.4 to 8.0.
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