Effects of Different Er:YAG Laser Parameters on Debonding Forces of Lithium Disilicate Veneers: A Pilot Study

Year 2019, , 8 - 13, 28.06.2019

Rifat Gozneli Merve Karagoz-yildirak , Sinem Ok-tokac Yasemin Ozkan

https://doi.org/10.35333/ERD.2019.7

Abstract

Abstract

Objectives:The aim of this study was to investigate the effects of different Er:YAG laser application parameters on shear bond strength values of all-ceramic restorations cemented to different tooth surfaces.

Materials and Methods:Thirty lithium disilicate ceramic disc specimens (thickness of 1 mm and diameter of 3 mm) were fabricated and cemented by using a dual-cure resin cement to 30 non-carious, extracted mandibular incisors, which were divided into 2 as; tooth reduction on enamel and on dentin. Six test groups (n=5) were designed according to the application method; 1st group on enamel and without laser application, 2nd group on dentin and without laser application, 3rd group on enamel and laser applied (600mJ, 2 Hz), 4th group on dentin and laser applied (600mJ, 2 Hz), 5th group on enamel and laser applied (165mJ, 30 Hz), 6th group on dentin and laser applied (165mJ, 30 Hz). The Er:YAG laser was applied on each specimen for 3 seconds. After the laser application, all groups were subjected to shear bond strength test until fracture. The failure modes were also examined. The data were statistically analyzed by using one-way ANOVA and post hoc T-test at a 0.05 level of significance. 

Results:According to one-way ANOVA test, there was statistically significant differences between the groups (p<0.05). Post hoc T-test revealed no statistically significant difference only between the groups 2 and 5. The mean shear bond strength of the specimens of group 1 was statistically higher than that of all the other groups (p<0.001).

Conclusion:Er:YAG laser-irradiation is a successful and effective application in removing ceramic veneers. When the depth of the tooth reduction amount increases, parameters such as; the frequency and energy of the laser application can be reduced for restorations with the same thicknesses.

Keywords

Er:YAG laser, ceramic veneer, shear bond strength

Farklı Er: YAG Lazer Parametrelerinin Lityum Disilikat Venerlerin Çıkarılma Kuvvetlerine Etkisi: Pilot çalışma

Abstract

Özet

Amaç:Bu çalışmanın amacı, farklı Er: YAG lazer parametrelerinin, farklı diş yüzeylerine simante edilmiş tam seramik restorasyonlarda makaslama bağlanma dayanımı değerlerine etkisini araştırmaktır.

Gereç ve Yöntemler:Otuz adet lityum disilikat seramik disk (1 mm kalınlık ve 3 mm çapında) üretildi ve labial yüzeylerinde mine ve dentin seviyesinde diş preparasyonu yapılan 30 adet çekilmiş çürüksüz alt kesici dişe simante edildi. Uygulama yöntemine göre 6 test grubu tasarlanmıştır (n=5); 1. grup mine yüzeyinde ve lazer uygulanmamış, 2. grupdentin yüzeyinde ve lazer uygulanmamış, 3. grup mine yüzeyinde ve Er: YAG lazer (600mJ, 2 Hz) uygulanan, 4. grup dentin yüzeyinde ve Er: YAG lazer (600mJ, 2 Hz) uygulanan, 5. Grup mine yüzeyinde ve Er: YAG lazer (165mJ, 30 Hz) uygulanan, 6. grup dentin yüzeyinde ve Er: YAG lazer (165mJ, 30 Hz) uygulanan. Er: YAG lazer her örneğe 3 saniye boyunca uygulandı.Lazer uygulama işleminden sonra, tüm gruplar kopma oluşana kadar makaslama bağlanma dayanımı testine tabi tutuldu. Numunelerin kopma paternleri incelendi. Elde edilen veriler istatistiksel olarak tek yönlü ANOVA ve post-hoc T-test kullanılarak 0.05 anlamlılık düzeyinde analiz edildi.

Bulgular:Tek yönlü ANOVA testi sonuçlarına göre gruplar arasında istatistiksel olarak anlamlı fark elde edilmiştir (p<0.05). Post hoc T-testine göre sadece 2. ve 5. gruplar arasında istatistiksel olarak anlamlı fark olmadığını görülmüştür. Grup 1'deki örneklerin ortalama makaslama bağlanma dayanımı değerleri, diğer tüm gruplardan istatistiksel olarak daha yüksek bulunmuştur (p<0.001). 

Sonuç:Er: YAG lazer seramik venerlerin çıkarılmasında başarılı ve etkili bir uygulamadır. Aynı kalınlıktaki restorasyonlar için, diş preparasyon derinliği arttıkça, lazer uygulama frekansı ve enerjisi gibi parametreler azaltılabilir.

Keywords

Er:YAG lazer, seramik vener, makaslama bağlanma dayanımı

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