An evaluation of physical properties of two calcium hydroxide and two zinc oxide-eugenol based sealers
Levy, Moise Edwin
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Root canal sealer is a vital component in the obturation of the root canal system. Two calcium hydroxide based sealers, CRCS and Sealapex, have recently been formulated and although their biologic properties have been well documented, little evidence exists in the literature to support their physical properties. The following investigation was undertaken with the objective of evaluating three important physical properties of root canal sealers: sealing ability, dimensional change after setting and solubility. Two calcium hydroxide based sealers, CRCS and Sealapex, were examined and compared to two established zinc oxide-eugenol based sealers, Kerr Sealer and Grossman's Cement. Sealing ability was evaluated on eighty extracted teeth using methylene blue dye penetration. Dimensional change after setting was evaluated qualitatively (visually and photographically) and quantitatively (by volume displacement). Solubility was determined in a quantitative manner by dissolving sealer tablets in distilled water and weighing the remaining residue. The results indicate that the teeth obturated with CRCS and Sealapex demonstrated the greatest tendency towards dye penetration. Sealapex exhibited extensive dye penetration in spite of seemingly well obturated root canal systems. With regard to dimensional changes after setting, all four sealers exhibited shrinkage over time. CRCS exhibited the greatest volume change and Kerr Sealer the least. Sealapex remained unset for most of the study and therefore the results obtained for this sealer were inconclusive. The greatest solubility over time was exhibited by CRCS, and the least soluble of the sealers was shown to be Kerr Sealer. Sealapex remained unset and could not be evaluated. All three sealers involved in the solubility experiment, Kerr Sealer, Grossman’s Cement and CRCS, increased in solubility over time. It was concluded that further investigation into the physical properties of the calcium hydroxide based sealers is warranted, especially that of setting time under varying conditions. The calcium hydroxide based sealers did not perform well under laboratory conditions when compared to their zinc oxide-eugenol counterparts; however it would be premature to consider these laboratory results indicative of results which would be obtained in a clinical setting.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1991 (Endodontics)Includes bibliography (leaves 136-143)
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