ZİRKONYUM YÜZEYLERE FARKLI YÜZEY PÜRÜZLENDİRME TEKNİKLERİ SONRASI YAPIŞTIRILAN SERAMİK BRAKETLERİN BAĞLANMA DAYANIMLARININ KARŞILAŞTIRMALI OLARAK İNCELENMESİ: İN-VİTRO ÇALIŞMA

Year 2022, Volume: 5 Issue: 2, 105 - 111, 30.06.2022

Emine Karslı , Evren Öztaş

https://doi.org/10.26650/JAHRS2022-1105417

Abstract

Amaç: Monolitik zirkonyum yüzeylere, estetik beklentileri karşılamak amacıyla sık tercih edilen seramik braketlerin bağlanma dayanımını inceleyen çalışmalara az rastlanmaktadır. Bu çalışmanın amacı farklı pürüzlendirme yöntemleri uygulanmış zirkonyum yüzeylere yapıştırılan seramik braketlerin bağlanma dayanımını ölçmek ve kopma bölgelerini Artık adeziv indeksi (Adhesive Remnant Index: ARI) skorlaması ile değerlendirmektir.
Gereç ve Yöntem: 40 adet zirkonyum blok 4 eşit gruba ayrılarak hidroflorik asit (HF), alüminyum oksit (Al2O3) ile kumlama, Er-YAG lazer ve Nd-YAG lazer ile yüzey pürüzlendirme işlemleri yapılmış ve tüm seramik braketler yüzeylere yapıştırılmıştır. Universal test cihazıyla braketlerin yüzeylere bağlanma dayanımları Megapaskal (Mpa) cinsinden kaydedilmiştir. Sıyırma testi sonrası zirkonyum yüzeylerdeki kopma bölgeleri optik mikroskopta x20 büyütme altında yüzeyler incelenmiştir.
Bulgular: Yapılan değerlendirme sonucunda sırasıyla bağlanma dayanımı ortalama değerleri 4,56±1,99 MPa, 6,88±2.04 MPa, 7,43±1,47 MPa, 5,66±2,31 MPa ile en düşük HF grubu, en yüksek ise Er-YAG grubu olmuş- tur. Er-YAG grubunda ölçülen değerin HF grubuna göre istatistiksel olarak anlamlı şekilde daha yüksek olduğu görülmüştür (p<0.05). ARI skorları incelendiğinde Er-YAG grubunda örneklerin %40’ında tüm artık kompozitin porselen yüzeyinde kaldığı (ARI skoru 1) görülmüştür.
Sonuç: Ortodonti kliniğinde kullanılan HF ile pürüzlendirme yöntemi son- rası braketlerin zirkonyum yüzeylere bağlanma dayanımı yetersiz bulunmuştur. Zirkonyum yüzeylere Er-YAG lazer ile pürüzlendirme yönteminin seramik braketlerde daha fazla bağlanma dayanımı sağladığı gösterilmiştir.

Keywords

monolitik zirkonyum, seramik braket, bağlanma dayanımı, yüzey pürüzlendirme, lazer

SHEAR BOND STRENGTH OF CERAMIC BRACKETS BONDED TO ZIRKONIUM SURFACES AFTER DIFFERENT SURFACE PREPERATION TECHNIQUES: AN IN VITRO STUDY

Abstract

Objective: There are few studies examining the shear bond strength (SBS) of ceramic brackets (which are frequently chosen to meet aesthetic expectations), on monolithic zirconium surfaces. The aim of this study is to measure the SBS of ceramic brackets adhered to the zirconium surfaces, to which different surface roughening methods have been applied and to evaluate the rupture areas with ARI scoring.
Materials and method: 40 zirconium blocks were divided into 4 equal groups and surface roughening processes performed with hydrofluoric acid (HF), sandblasting with aluminum-oxide (Al2O3), Er-YAG and Nd-YAG laser. All ceramic brackets were adhered to the surfaces. The SBS values of the brackets to surfaces were recorded in MPa with a universal test machine. For ARI scoring, the surfaces were examined under x20 magnification with optical microscope.
Results: the mean SBS values were 4.599±1.989, 6.879±2.037, 7.429±1.468, 5.665±2.308 MPa respectively, with the lowest being the HF group and the highest being the Er-YAG group. It was observed that the measured value in the Er-YAG group was statistically higher than the HF group. When Adhesive Remnant Index (ARI) scores were examined, it was observed that in 40% of the samples in the Er-YAG group, all residual composite remained on the zirconium.
Conclusion: the SBS of the HF method, which is frequently used in orthodontic clinics, to zirconium was found insufficient. It has been shown that surface roughening of zirconium with Er-YAG laser provides more SBS with ceramic brackets.

Keywords

monolithic zirconium, ceramic bracket, bond strength, surface roughening, laser

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