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    Effects of Implant Angulations and Attachment Configurations on the Retentive Forces of Locator Attachment-Retained Overdentures
    (Quintessence Publishing Co Inc, 2014) Uludag, Bulent; Polat, Serdar; Sahin, Volkan; Comut, Ali Alper
    Purpose: The aim of this study was to evaluate the effects of different implant angulations and attachment configurations on the retentive forces of locator attachment-retained overdentures over a simulated time period of 6 months. Materials and Methods: Two acrylic resin models (models 1 and 2) were fabricated to represent an edentulous mandible. In model 1, the midline implant (in the central region) was vertical and the other two implants (in the canine regions) were 20 degrees divergent from the midline, reaching a total divergence of 40 degrees. In model 2, all three implants were vertically oriented, perpendicular to the occlusal plane and parallel to each other. Three-point vertical pull-out forces were employed in a universal testing machine at a constant crosshead speed of 50 mm/min after overdenture construction and a simulation of 6 months of repeated insertions/removals of the overdenture. Locator attachments with different male combinations and bar and clip attachments were tested in model 1. Clear locator attachments and bar and clip attachments were tested in model 2 and served as controls. Results: The initial retentive forces of all attachments in both models ranged from 26.58 to 62.05 N, whereas the initial retentive forces of the attachments for only model 1 ranged from 49.58 to 62.05 N. The highest retention value was recorded for clear green locator attachments and the lowest for hader bar yellow clip attachments. Locator attachments showed higher retention values than hader bar yellow clip attachments. Conclusion: All attachment systems demonstrated a decrease in retention over time. Locator attachments provided better retention than hader bar yellow clip attachments. The highest retention values were obtained when green male locators were used in combination with male attachments.
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    Microleakage of Inlay Ceramic Systems Luted with Self-adhesive Resin Cements
    (Quintessence Publishing Co Inc, 2014) Uludag, Bulent; Yucedag, Elif; Sahin, Volkan
    Purpose: To evaluate the microleakage of Cerec 3, IPS e. max Press, and Turkom-Cera inlays cemented with three self-adhesive resin cements. Materials and Methods: Ninety standardized class III MOD cavities were prepared in intact human mandibular third molars. Ceramic inlays were fabricated according to the manufacturer's instructions and were cemented using three self-adhesive resin cements (RelyX Unicem, Smartcem 2, and SpeedCEM). The specimens were stored in distilled water at 37 degrees C for 24 h and subjected to 1000 thermocycles in water between 5 degrees C and 55 degrees C with a dwell time of 30 s. Subsequently, the specimens were subjected to 100,000 cycles of mechanical loading of 50 N at 1.6 Hz in 37 degrees C water. The specimens were immersed in 0.5% basic fuchsine for 24 h and were sectioned using a low-speed diamond blade. The percentage of dye leakage at the tooth/restoration interface was measured and compared by Kruskal-Wallis tests with Bonferonni correction and Mann-Whitney U-tests at a significance level of p < 0.05. Results: Microleakage at the RelyX Unicem interface was lower than that with Smartcem 2 and SpeedCEM resin cements (p < 0.05). Microleakage of the Turkom-Cera system was higher than Cerec 3 and IPS e. max Press ceramic inlays (p < 0.05). Conclusions: Regardless of the ceramic system and self-adhesive resin cement used, dentin margins were associated with higher microleakage than enamel margins.
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    Replacement of a Lost Removable Partial Dental Prosthesis Using Ball-Attachment Analogs: A Clinical Report
    (Wiley-Blackwell, 2011) Uludag, Bulent; Sahin, Volkan; Polat, Serdar
    Attachment-retained removable partial dental prostheses (RPDPs) may be lost. Although in such situations, the RPDP should be remade, no method has yet been described for replacing lost attachment-retained RPDPs. This report describes a method for fabrication of a replacement for a lost maxillary RPDP using ball-attachment analogs.