Findings from University of Washington Provides New Data on Prosthetic Dentistry (Effect Of Modifying The Screw Access Channels Of Zirconia Implant Abutment On The Cement Flow Pattern And Retention Of Zirconia Restorations)
By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators discuss new findings in Dentistry. According to news reporting from Seattle, Washington, by NewsRx journalists, research stated, "Statement of problem. The effect of managing the screw access channels of zirconia implant abutments in the esthetic zone has not been extensively evaluated."
The news correspondents obtained a quote from the research from the University of Washington, "The purpose of this study was to determine the effect of an insert placed within the screw access channel of an anterior zirconia implant abutment on the amount of cement retained within the restoration-abutment system and on the dislodging force. Thirty-six paired zirconia abutments and restorations were fabricated by computer-aided design and computer-aided manufacturing and were divided into 3 groups: open abutment, with the screw access channel unfilled; closed abutment, with the screw access channel sealed; and insert abutment, with a thin, tubular metal insert projection continuous with the screw head and placed into the abutment screw access channel. The restorations were cemented to the abutments with preweighed eugenol-free zinc oxide cement (TempBond NE). Excess cement was removed, and the weight of the cement that remained in the restoration-abutment system was measured. Vertical tensile dislodging forces were recorded at a crosshead speed of 5 mm/min after incubation in a 37 degrees C water bath for 24 hours. The specimens were examined for the cement flow pattern into the screw access channel after dislodgement. Data were analyzed with ANOVA, followed by multiple comparisons by using the Tukey honestly significant difference test (alpha=.05). The mean (standard deviation) of retentive force values ranged from 108.1 +/- 29.9 N to 148.3 +/- 21.0 N. The retentive force values differed significantly between the insert abutment and both the open abutment (P <.05) and closed abutment groups (P <.01). Distinct patterns of cement failure were noted. The weight of the cement that remained in the system differed significantly, with both open abutment and insert abutment being greater than closed abutment (P <.05)."
According to the news reporters, the research concluded: "Modifying the internal configuration of the screw access channel of an esthetic zirconia implant abutment with a metal insert significantly affected both the cement retained within the abutment itself and the retention capabilities of the zirconia restoration cemented with TempBond NE cement."
For more information on this research see: Effect Of Modifying The Screw Access Channels Of Zirconia Implant Abutment On The Cement Flow Pattern And Retention Of Zirconia Restorations. Journal of Prosthetic Dentistry, 2014;112(1):45-50. Journal of Prosthetic Dentistry can be contacted at: Mosby-Elsevier, 360 Park Avenue South, New York, NY 10010-1710, USA. (Elsevier - www.elsevier.com; Journal of Prosthetic Dentistry - www.elsevier.com/wps/product/cws_home/623237)
Our news journalists report that additional information may be obtained by contacting C. Wadhwani, University of Washington, Dept. of Restorat Dental, Seattle, WA 98195, United States (see also Dentistry).
Keywords for this news article include: Seattle, Dentistry, Washington, United States, North and Central America
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