The Effect of Single/Double Application of Universal Adhesive on Bond Strength

Öz

Aim: The aim of this study was to evaluate the effect of the application of two layers of universal adhesive agent on the bond strength of compomer on primary tooth dentin. Materials and Methods: 20 caries-free primary molars were used in the study. Occlusal surfaces of the teeth were cut to expose a flat dentin surface and abraded with wet 600 grit silicon carbide paper to obtain a smear layer. The universal adhesive agent (Prime & Bond Universal, Dentsply Sirona, New York, USA) was applied to the samples by two different methods: Group 1) The adhesive agent was applied in a single coat, air-diluted and light cured; Group 2) Adhesive agent applied in two layers, diluted with air and light cured on each layer. Subsequently, compomer (Dyract XP, Dentsply Sirona, New York, USA) restorations were made to both groups. All samples were subjected to 500 thermal cycles and then sectioned for microtensile testing. Two sections from each tooth were obtained so that there were 20 samples in each group. The testing was conducted using a universal testing machine at a crosshead speed of 1mm/min (Micro Tensile Tester, T-61010Ki, Bisco, Schaumburg, USA). Failure modes were determined under a stereomicroscope. Results were analyzed using the t-test and chi-square analysis. Results: Average microtensile bonding values for Groups 1 and 2 are 12.0±5.8 and 16.7±7.4 MPa, respectively. Higher MPa values were observed as a result of applying two layers of universal adhesive, and the difference between the two groups was found to be statistically significant (p <0.05). While mixed type fractures covering both dentine and adhesive surface were observed more in Group 2 (60%), adhesive type fracture between the restorative material and tooth tissue was observed more in Group 1 (70%). There was no statistically significant difference between the groups (p> 0.05). Conclusion: Increasing the number of layers of the universal adhesive used in compomer restorations applied to primary teeth showed an increasing effect on the bond strength.

Anahtar Kelimeler

• Bond strength
• Compomer
• Dentin
• Universal adhesive

UNİVERSAL ADEZİVİN TEK/ÇİFT KAT UYGULANMASININ BAĞLANMA DAYANIMI ÜZERİNE ETKİSİ

Öz

Amaç: Bu çalışmanın amacı, bir universal adeziv ajanın tek/iki kat uygulanmasının kompomerin süt dişi dentinine bağlanma dayanımı üzerine olan etkisini değerlendirmektir. Gereç ve Yöntem: Çalışmada 20 adet çürüksüz süt molar diş kullanılmıştır. Dişlerin okluzal yüzeyleri düz bir dentin yüzeyi elde etmek amacıyla kesilmiş ve ardından smear tabakası elde etmek amacıyla 600 gritlik silikon karbid zımpara ile aşındırılmıştır. Örneklere, universal adeziv ajan (Prime & Bond Universal, Dentsply Sirona, New York, ABD) iki farklı yöntemle uygulanmıştır: Grup 1) Adeziv ajan tek kat uygulanmış, hava ile inceltilmiş ve ışıkla polimerize edilmiştir; Grup 2) Adeziv ajan iki kat uygulanmış, her katta hava ile inceltilmiş ve ışıkla polimerize edilmiştir. Ardından, her iki gruba da kompomer (Dyract XP, Dentsply Sirona, New York, ABD) restorasyonlar yapılmıştır. Tüm örnekler 500 termal siklusa tabi tutulmuş ve sonrasında mikrogerilim testi için kesitlere ayrılmıştır. Her dişten 2 kesit elde edilmiş böylece her grupta 20 adet örnek olması sağlanmıştır. Örneklerin mikrogerilim bağlanma dayanımı (µTBS) değerleri mikrogerilim test cihazında (Micro Tensile Tester, T-61010Ki, Bisco, Schaumburg, ABD), örneklere 1 mm/dk hızla kuvvet uygulanarak ölçülmüştür. Kırık tipleri stereomikroskop altında incelenmiştir. Sonuçlar Ki-Kare analizi ve t testi ile değerlendirilmiştir. Bulgular: Ortalama mikrogerilim bağlanma değerleri Grup 1 ve 2 için sırasıyla 12,0±5,8 ve 16,7±7,4 MPa’dır. Universal adezivin iki kat uygulanması sonucunda daha yüksek MPa değerleri gözlenmiş ve iki grup arasındaki fark istatistiksel olarak anlamlı bulunmuştur (p<0,05). Hem dentin hem adeziv yüzeyini kapsayan karışık tip kırık Grup 2’de daha çok gözlenmişken (%60), restoratif materyalle diş dokusu arasında oluşan adeziv tip kırık Grup 1’de daha çok gözlenmiştir (%70). Kırık tipleri açısından gruplar arasında istatistiksel olarak anlamlı fark tespit edilmemiştir (p>0,05). Sonuç: Süt dişine uygulanan kompomer restorasyonlarda kullanılan universal adezivin tabaka sayısının arttırılmasının bağlanma dayanımını arttırıcı etkisi olmuştur.

Anahtar Kelimeler

• Bağlanma dayanımı
• Dentin
• Kompomer
• Universal adeziv

Kaynakça

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