Browsing by Author "Goktas, Baris"

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Micro-Shear Bond Strength of Adhesive Resins To Enamel at Different Relative Humidity Conditions
(Japanese Soc dental Materials devices, 2013) Bavbek, Andac Barkin; Demir, Erhan; Goktas, Baris; Ozcopur, Betul; Behram, Benin; Eskitascioglu, Gurcan; Ozcan, Mutlu
This study tested whether exhaled humid conditions would affect the adhesion of etch-and-rinse, two-step and one-step self-etch adhesive resins to enamel. Enamel surfaces of human maxillary anterior teeth (N=240, n=20) were exposed to four humid conditions (H1: 63-68%, H2: 73-78%, H3: 93-98%, H4: 36-45% RH) during bonding with Adper Single Bond 2 (SB2), Clearfil SE Bond (CSE) and Adper Easy Bond (AEB). Specimens were stored in distilled water at 37 degrees C for 24 h and tested to failure using micro-shear bond strength (mu SBS) test. Data were analyzed using two-way ANOVA and Tukey's test (p<0.05). The mu SBS to enamel with SB2, CSE and AEB was not significantly affected by humidity parameters. AEB resulted in significantly lower mu SBS in all conditions. The frequency of adhesive failures was the highest at H2, H3 for SB2, H3 for CSE and H1-4 for AEB indicating that humidity conditions may decrease adhesion quality to enamel.
Micro-Shear Bond Strength of Resin Cement To Dentin After Application of Desensitizing Toothpastes
(informa Healthcare, 2013) Bavbek, Andac Barkin; Goktas, Baris; Cekic Nagas, Isil; Egilmez, Ferhan; Ergun, Gulfem; Eskitascioglu, Gurcan
Objectives. The aim of the study was to evaluate the effect of three desensitizing toothpastes on bonding of resin cements to dentin. Materials and methods. The occlusal surfaces of 72 maxillary third molars were ground to obtain flat dentin surfaces and then divided into three groups according to three desensitizing toothpastes used: Sensodyne Rapid Relief (GlaxoSmithKline, SmithKline Beecham Ltd., Slough, UK), Signal Sensitive Expert (Unilever Sanayi ve Ticaret Turk A.S., Umraniye, Istanbul, Turkey) and Colgate Sensitive Pro-Relief (Colgate Palmolive, New York, NY). Following bonding of the resin cement (Clearfil (TM) SA Cement, Kuraray Co, Osaka, Japan) to dentin, the specimens were light cured for 40 s with a LED (Elipar S10, 3M Espe, St. Paul, MN). The strength measurements were accomplished with a micro-shear testing machine (Bisco, Schaumburg, IL) at a cross-head speed of 0.5 mm/min until the failure occurs. Failure modes were examined using a stereomicroscope and scanning electron microscope. The data were analyzed with one-way analysis of variance (ANOVA) and Tukey HSD test (alpha = 0.05). Results and conclusion. ANOVA revealed that the application of desensitizing toothpastes had significant effects on bond strength of the resin cement tested to dentin (p < 0.05). Mixed failures were observed in all of the groups. Clinical significance. The use of a desensitizing toothpaste before cementation might alter the bond strength of adhesively luted restorations.