The effect of environmental pressure changes on the bond strength between zirconia ceramic and adhesive resin cement

Abstract

Purpose The purpose of this study was to investigate the effect of the environmental pressure changes on the bond strength between zirconia ceramics and adhesive resin cement. Design/methodology/approach In total, 40 rectangular-shaped zirconium-oxide ceramic specimens were prepared. For surface modification, all zirconia specimens were sandblasted with 50 μm alumina particles. The composite resin discs were bonded to modified zirconia surfaces with resin cement. The specimens were divided into four groups; hyperbaric, hypobaric, hyperbaric + hypobaric and control group. The specimen underwent pressure cycles for 30 days. The shear bond strength test was performed by using the universal testing machine, and failures of the debonded samples were examined with scanning electron microscopy and light microscope. Findings No significant difference in bond strength was found between the hyperbaric, hypobaric and control groups after 30 days (p > 0.05). However, there was a significant difference in the hyperbaric + hypobaric group compared to the control group (p = 0.022). Also, the Weibull modulus was highest in control group and lowest in the hyperbaric + hypobaric group. Originality/value Barometric changes due to flying followed by diving may have an adverse effect on the retention of zirconia ceramics. Care should be taken in the selection of materials for dental treatment of people who are exposed to environmental pressure changes.

Effect of Different Polymerization Devices on Surface Hardness of Two Different Resin Materials Used in Three-Dimensional Printers: An In Vitro Study

“…iken, özellikle endokuron yapımında kullanılan mikro seramik kompozitlerin polimerizasyonunda Labolight LV-III (GC, Japonya) gibi farklı polimerizasyon ünitelerinden faydalanılır. 9,10 Üç boyutlu yazıcılarda kullanılan kompozit reçinelerin polimerizasyonunda ise geniş dalga boyuna sahip aşağıdan polimerizasyon haznesine yansıyan 2 flaş ampulü bulunan cihazlar ile hızlı ve güvenilir bir şekilde polimerizasyon sağlanmaktadır (BEGO Otoflash, Bremen Almanya). 11 Konvansiyonel üretimden farklı olarak daha hızlı ve düşük maliyetli üretim imkânı sunan 3 boyutlu yazıcılarda basılan örneklerin daha iyi mekanik özelliklere sahip olması için "post curing" işlemi gerçekleştirilmektedir.…”