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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

February 2010
Volume 41 , Issue 2

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Mineral trioxide aggregate for direct pulpcapping: A histologic comparison with calcium hydroxide in rat molars

Till Dammaschke, Priv-Doz Dr Med Dent/Philipp Wolff, Dr Med Dent/Darius Sagheri, Dr Med Dent/Udo Stratmann, Prof Dr Med Dent/Edgar Schäfer, Prof Dr Med Dent

PMID: 20165737

Objectives: Several studies reported superior healing results for ProRoot mineral trioxide aggregate (MTA; Dentsply Tulsa) cement in direct pulp capping when compared to calcium hydroxide. However, this could not be confirmed by other authors. The aim of this study was to compare the reaction of MTA-treated rat pulp tissue to calcium hydroxide [Ca(OH)2]–treated rat pulp tissue in direct pulp capping after 1 to 70 days. Method and Materials: Seventy-two caries-free, maxillary right and left first molars of 36 Wistar rats were prepared with an occlusal cavity. The pulp chambers were then perforated with a sharp probe. For each of four time periods, MTA was placed on the exposed pulp of 10 molars according to the manufacturer’s instructions, and Ca(OH)2 was placed on 8 molars. All cavities were then filled with dentin adhesive and flowable composite. The animals were sacrificed 1, 3, 7, and 70 days after pulp capping. The pulps were histologically analyzed (light and transmission electron microscopic) for bacterial infection, inflammatory cells, necrosis, and reparative dentin and classified according to occurrence in scores from 1 to 4. To ensure that the coronal restorations did not leak, occlusal cavities were prepared in four maxillary molars of one rat. The coronal cavity was then sealed with resin. After 70 days, the rat was sacrificed, and the molars were immersed in new fuchsin. Data were statistically evaluated with the Kruskal-Wallis test (P < .05). Results: The MTA group showed statistically significantly lower signs of necrosis 1 and 3 days after pulp capping when compared with the Ca(OH)2 group (P < .05). No other statistically significant differences were found (P > .05). After 70 days, all pulps displayed healthy tissue. In the leakage test, no specimens revealed any dye penetration. Conclusion: MTA showed equally good results as Ca(OH)2 and can be recommended clinically for direct pulp capping. (Quintessence Int 2010;41:e20–e30)

Key words: calcium hydroxide, direct pulp capping, histology, mineral trioxide aggregate, rat, tissue reactions

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