Abaza Engy Fahmy, Zaki Ahmed Abbas, Moharram Haytham Samir, Batouti Amal Alaa El Din El, Yassen Asmaa Aly
Department of Health Radiation Research, National Centre for Radiation Research and Technology, Cairo, Egypt.
Department of Medical Laser Applications, National Institution of Laser Enhanced Sciences, Cairo University, Cairo, Egypt.
Eur J Dent. 2018 Jul-Sep;12(3):338-343. doi: 10.4103/ejd.ejd_305_17.
To evaluate the effect of gamma radiation on microshear bond strength and nanoleakage of nanofilled restoratives in laser-prepared cavities.
Twenty-eight flat buccal dentin surfaces were prepared for microshear bond strength test. Er, Cr:YSGG laser was used to prepare another 28 Class V cavities on the buccal surfaces of the molars. All teeth were divided into four groups; 1 group: Application of Filtek Z350 nanocomposite material, 2 group: As the 1 group and then exposure to gamma radiation, 3 group: Application of Ketac N100 nanoglass ionomer, and the 4 group: As the 3 group and then gamma irradiated. The bond strength test was performed after storage in artificial saliva for 24 h. For the nanoleakage test, teeth were submerged in a solution of ammoniacal silver nitrate, sectioned, and then examined under a scanning electron microscope. The collected data were statistically analyzed.
Nanocomposite showed higher bond strength values than nanoglass ionomer. Despite the fact that gamma radiation did not decrease nanocomposite bond strength, it decreased nanoglass ionomer bond strength. Nanoglass ionomer-restored cavities showed higher silver ion penetration than nanocomposite in both control and gamma-irradiated groups.
Gamma radiation has no effect on bond strength and nanoleakage of nanocomposite so that it can be placed before radiotherapy. On the other hand, the bond strength of nanoglass ionomer was adversely affected by gamma radiation.
评估γ射线辐射对激光制备窝洞中纳米填充修复材料微剪切粘结强度和纳米渗漏的影响。
制备28个平坦的颊侧牙本质表面用于微剪切粘结强度测试。使用铒铬：钇钪镓石榴石激光在磨牙颊面制备另外28个V类窝洞。所有牙齿分为四组；1组：应用Filtek Z350纳米复合材料；2组：同1组，然后进行γ射线辐射；3组：应用Ketac N100纳米玻璃离子水门汀；4组：同3组，然后进行γ射线辐射。在人工唾液中储存24小时后进行粘结强度测试。对于纳米渗漏测试，将牙齿浸泡在氨硝酸银溶液中，切片，然后在扫描电子显微镜下检查。对收集的数据进行统计学分析。
纳米复合材料的粘结强度值高于纳米玻璃离子水门汀。尽管γ射线辐射并未降低纳米复合材料的粘结强度，但它降低了纳米玻璃离子水门汀的粘结强度。在对照组和γ射线辐射组中，纳米玻璃离子水门汀修复的窝洞均显示出比纳米复合材料更高的银离子渗透。
γ射线辐射对纳米复合材料的粘结强度和纳米渗漏没有影响，因此可以在放射治疗前放置。另一方面，纳米玻璃离子水门汀的粘结强度受到γ射线辐射的不利影响。
