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The aim of this study was to compare the shear bond strengths (SBS), failure modes (adhesive, cohesive, or mixed), and marginal microleakage occurrence of conventional resin (CR)-based, glass ionomer (GI)-based, and self-adhesive resin (SAR)-based fissure sealants with or without prior phosphoric acid (PA) etching. Fifty extracted premolars were randomly and equally assigned into five groups -G1:PA+CR, G2:PA+GI, G3:GI, G4:PA+SAR, and G5:SAR. Prior PA etching significantly (p<0.05) increased the SBSs of sealants. Adhesive failure mainly occurred in teeth treated with SAR-or GI-based fissure sealants, and cohesive failure mainly occurred in PA-etched teeth. Microleakage occurrence differed significantly (p<0.05) among the five groups of treated teeth. We concluded that conditioning of a tooth's enamel surface is crucial to creating strong bonds and leak-free sealing between tooth and fissure sealant.

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Bu çalışmanın amacı; renklendirici solüsyonlarda bekletilen dört farklı kompozit rezin materyalinin, beyazlatıcı etkili ağız gargarası veya diş macunu uygulamaları ile oluşan renklenmeyi giderme üzerine hangi beyazlatma ürününün daha etkili olduğunun in vitro olarak değerlendirilmesidir. Gereç ve Yöntem: Dört farklı kompozit rezinden (bir Nano-seramik (Zenit, President Dental), bir Nano-fil (Filtek Ultimate, 3M-ESPE), bir Nano-hibrit akışkan (Premise, Kerr Corporation) ve bir Mikro-hibrit (Gradia Direct Anterior, GC) 5mm çapında ve 2mm derinliğinde toplam 80 adet (n=20) disk şeklinde örnekler hazırlandı ve başlangıç renk ölçümleri yapıldı. Her bir materyal grubunda hazırlanan örnekler rastgele gargara ve diş macunu grubu olarak iki alt gruba ayrıldı. Tüm örnekler sırasıyla, altı gün çay ve sonrasında altı gün kahve içerisinde renklenmeleri için bekletildi. Gargara alt grubundaki örnekler (n=10) 12 günlük renklendirme periyodu sonrasında Listerine Advanced White (Johnson&Johnson) beyazlatıcı ağız bakım gargarasında 12 saat bekletilerek beyazlatma işlemine tabii tutuldu. Diş macunu alt grubundaki örnekler (n=10) elektrikli diş fırçası kullanılarak günde bir defa beyazlatıcı diş macunu İpana 3D White Luxe Perfection (Procter & Gamble) ile 12 günlük renklendirme periyodu boyunca fırçalandı. Örneklerin renklendirme işlemi öncesi ve beyazlatma işlemleri sonrası arasındaki renk farklılıkları CIEDE2000 formülü kullanılarak hesaplandı. İstatistiksel analizler iki yönlü varyans analizi ve Bonferroni testi ile yapıldı. (p<0,05) Bulgular: Gargara ve diş macunu alt grubundaki örnekler karşılaştırıldığında aralarında istatistiksel olarak fark bulunmuş (˂0.001), gargara alt grubundaki örneklerin renk değişim değeri (ΔE00), diş macunu alt grubundaki örneklere göre daha yüksek bulunmuştur. Gradia Direct haricinde diğer kompozit rezinlerin renk değişim değerleri kabul edilebilirlik eşik değerinin üzerinde olduğu tespit edilmiştir. Sonuç: Kompozit rezinlerde diş macununun, gargaraya göre daha etkili bir beyazlatma sağladığı gözlemlenmiştir. Bu çalışma ayrıca nano kompozitlerin mikrohibrit kompozitlere göre daha düşük renk stabilitesine sahip olduğunu göstermiştir. Anahtar Kelimeler: kompozit rezin, beyazlatıcı etki, ağız gargarası, diş macunu ABSTARCT Aim: The aim of this study was to determine the effect of application of whitening mouth rinse and toothpaste which whitening agents are more effective on remove discoloration of four different composite resins that stained with colored beverages in vitro. Materials and Methods: Eighty disc-shaped specimens (5 mm diameter, 2 mm deep) of a nano-ceramic (Zenit, President Dental), a nano-filled (Filtek Ultimate, 3M-ESPE), a nano-hybrid flowable (Premise, Kerr Corporation) and a micro-hybrid (Gradia Direct Anterior, GC) resin composites were prepared (20 from each) and initial colors were measured. Specimens of each material were divided into two as random mouth rinse and toothpaste subgroups. All specimens were immersed in tea for six days and coffee for six days respectively. After stai...

The aim of the study was to evaluate the effect of commonly used mouthrinses on the discoloration and whiteness of resin-based restoratives (RBR). Two hundred disc shaped specimens (5mm diameter, 2mm tick) of a micro-hybrid composite (FZ-Filtek Z250, 3M ESPE), a ormocer (AD-Admira, Voco), a giomer (BE-Beautifil II, Shofu) and a compomer (DX-Dyract XP, Dentsply) RBRs were prepared (50 from each). The specimens were stored in distilled water for 24 h, then immersed for another 12 h in five mouthrinses of distilled water, Klorhex, Tantum Verde, Oral-B Complete Lasting Freshness and Listerine Cool Mint. The specimens were subjected to color measurements, using a spectrophotometer (VITA Easyshade V, VITA Zahnfabrik) before and after immersion. Color change (ΔE00) and whiteness index (WID) were calculated and data were analyzed using one-way ANOVA, two-way ANOVA and post-hoc Tukey's test (p < 0.05). BE was the most colored RBRs in all solutions. ΔE 00 values of all RBRs immersed in Tantum Verde were above the acceptability threshold. DX showed the highest negative ΔWID values in all solutions. ΔE 00 and ΔWID showed higher values for all RBRs when immersed in Tantum Verde. FZ and AD are the most successful, BE and DX are the most unsuccessful RBRs in terms of on color stability and whiteness caused by the use of mouthrinse. After all RBRs were immersed in different mouthrinses, they changed in terms of color and whiteness.

Objectives:The aim of this study was to determine the effect of coating on the color stability of different glass ionomer cements (GICs) after immersed in different children beverages. Materials and Methods:Four different GIC and a glass-ionomer coating material were used in this study. Disc shaped sixteen specimens of each GICs were done and divided into two groups, uncoated and coated (n=8). For color change, the specimens were immersed 7 day in the four solutions of cola, orange juice, chocolate milk and water. The color measurements were carried out before immersed solutions and at the end of the 1st and 7th days, using a spectrophotometer. The color change ΔE 00 was calculated using the CIEDE2000 formula. Data were analyzed by Kruskall-Wallis and Wilcoxon test (p<0.05). Results:The ΔE 00 values for all coated and uncoated GICs showed an increase in all solutions after 7 days of immersion. All the ΔE 00 values obtained from all the specimens immersed in cola were higher than the acceptability threshold. There was no statistical difference in terms of ΔE 00 values between the coated and uncoated specimens of the same GICs at same time periods. Conclusions:Coating of GICs exhibited relatively good color stability and protect from the discoloration. The staining effect of GICs should be carefully considered when selecting dental materials in pediatric dentistry.