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    The effect of repeated firings on the color of an alumina ceramic system with two different veneering porcelain shades
    (Mosby-Elsevier, 2010) Şahin, Volkan; Uludağ, Bülent; Üşümez, Aslıhan; Özkır, Serhat Emre
    Statement of problem Possible sources of processing variables in porcelain firing include thickness and color of the opaque, thickness, color, and translucency of the body and enamel layers, firing temperature, and number of firings Purpose The purpose of this in vitro study was to investigate the color changes of an alumina ceramic system veneered with different veneering porcelain shades and fired different numbers of times Material and methods Twenty disc-shaped ceramic specimens (10 mm in diameter, with a core thickness of 1 mm), with 2 different veneering porcelain shades (A1, A3), were fabricated from an alumina ceramic system (Turkom-Cera) (n=10) Repeated firings (3, 5, 7, or 9 firings) were performed, and color differences (Delta E) were determined using a spectrophotometer Repeated-measures ANOVA was used to analyze the data (number of firings, veneering porcelain color) The Duncan test and paired 2-tailed tests were used for multiple comparisons (alpha = 05) Results The L*a*b* values of the ceramic system were affected by the number of firings (3, 5, 7, or 9) (P < 005) and veneering porcelain shade (P < 001) Significant interactions were present between the number of firings and the veneering porcelain shade for L* (P = 002), a* (P = 001), and b* (P = 001) values A1 shade specimens maintained their L* value independent of the number of firings, whereas A3 shade specimens became lighter after an increased number of firings For both A1 and A3 veneering porcelain shades, the a* value decreased after repeated firings, which resulted in less reddish specimens, and the b* value decreased after repeated firings, which resulted in less yellowish specimens Conclusions Imperceptible (Delta E<1 6) and clinically acceptable color changes (Delta E<3 7) were demonstrated by the alumina ceramic system tested (J Prosthet Dent 2010,104 372-378)
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    A Technique for Constructing a New Maxillary Overdenture to a Nonretrievable Implant Connecting Bar
    (Allen Press Inc, 2013) Uludağ, Bülent; Polat, Serdar; Şahin, Volkan; Göktuğ, Gürkan
    The most frequent mechanical complications of the bar-implant-retained overdentures are loosening of the bar screws and the need to reactivate the retentive clips. This article describes a technique to construct a new maxillary overdenture to a nonretrievable round-profile implant connecting bar with 2 distally placed attachments. The retainer round-profile bar was nonretrievable due to a worn retaining screw head. Attachment transfer analogs are used to transfer the position of the attachments to the master cast. The technique allows the clinician to construct new overdentures without the need for removal of the implant connecting bar. Reduced chairside time, reduced treatment cost, and increased patient satisfaction are the major advantages of the technique.