An in vitro investigation into the retrograde sealing ability of a glass ionomer cement (ketac-silver)
Knight, David J.
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The objective of this in vitro study was to evaluate the effectiveness of the retrograde apical seal obtained by using Ketac Silver, a dentin bonding, radiopaque glass ionomer cement. A zinc containing amalgam, Dispersalloy, was used as a comparative control material. According to the literature, moisture contamination affects the physical properties of these cements. This factor was thus incorporated into the present study, where fresh plasma was used as a retrograde contaminent, perhaps similar to conditions found during a normal retrograde surgical procedure. Seventy freshly extracted non-carious single rooted human teeth were used to demonstrate the retrograde sealing ability of Ketac Silver cement and Dispersalloy amalgam. Sixty of the teeth were divided into six groups of ten teeth each. Root sections were prepared by sectioning the coronal and apical ends of each tooth, leaving just the mid-root section for research purposes. The canals were then cleaned and shaped using files, reamers, and Gates Glidden burs. NAOC1 was used as irrigation solution. Following obturation of the canals using the warm gutta percha technique, both ends of the root sections were mechanically prepared using an inverted carbide bur to receive the Ketac Silver and Dispersalloy filling material. [TRUNCATED]
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.Colored photographs included.Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1986 (Endodontics)Bibliography : leaves 142-160.
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