Pulp tissue reaction to four dental cements

Pulp tissue reactions to four commonly used dental cements were histo-patho logically evaluated by placing the cements on exposed monkey dental pulp fo llowed by a surface-sealed adhesive restoration. Evaluations were done at 3 or 5, and 30 and 90 days after operation. No serious inflammatory reaction of the pulp, such as necrosis or abscess formation, was observed, However, the conventional dental cements showed irritating effects on the exposed m onkey dental pulp without bacterial contamination. Reactions of exposed den tal pulp beneath the dental cements differed depending on the materials use d.