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CC BY-NC-ND 4.0 · Eur J Dent 2018; 12(03): 338-343
DOI: 10.4103/ejd.ejd_305_17
Original Article
Dental Investigation Society

Influence of gamma radiation on microshear bond strength and nanoleakage of nanofilled restoratives in Er, Cr:YSGG laser-prepared cavities

Engy Fahmy Abaza
1   Department of Health Radiation Research, National Centre for Radiation Research and Technology, Cairo, Egypt
,
Ahmed Abbas Zaki
2   Department of Medical Laser Applications, National Institution of Laser Enhanced Sciences, Cairo University, Cairo, Egypt
,
Haytham Samir Moharram
2   Department of Medical Laser Applications, National Institution of Laser Enhanced Sciences, Cairo University, Cairo, Egypt
,
Amal Alaa El Din El Batouti
1   Department of Health Radiation Research, National Centre for Radiation Research and Technology, Cairo, Egypt
,
Asmaa Aly Yassen
3   Conservative Dentistry Department, Faculty of Dentistry, Cairo University, British University in Egypt, Cairo, Egypt
› Author Affiliations
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Publication History

Publication Date:
16 September 2019 (online)

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ABSTRACT

Objective: To evaluate the effect of gamma radiation on microshear bond strength and nanoleakage of nanofilled restoratives in laser-prepared cavities. Materials and Methods: 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; 1st group: Application of Filtek Z350 nanocomposite material, 2nd group: As the 1st group and then exposure to gamma radiation, 3rd group: Application of Ketac N100 nanoglass ionomer, and the 4th group: As the 3rd 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. Results: 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. Conclusion: 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.

Key words:

Bond strength - Er - Cr:YSGG laser - gamma radiation - nanoglass ionomer - nanocomposite - nanoleakage
 

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