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

Engy Fahmy Abaza; Ahmed Abbas Zaki; Haytham Samir Moharram; Amal Alaa El Din El Batouti; Asmaa Aly Yassen

doi:10.4103/ejd.ejd_305_17

European Journal of Dentistry, Table of Contents

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

¹Department of Health Radiation Research, National Centre for Radiation Research and Technology, Cairo, Egypt

,

Ahmed Abbas Zaki

²Department of Medical Laser Applications, National Institution of Laser Enhanced Sciences, Cairo University, Cairo, Egypt

,

Haytham Samir Moharram

²Department of Medical Laser Applications, National Institution of Laser Enhanced Sciences, Cairo University, Cairo, Egypt

,

Amal Alaa El Din El Batouti

¹Department of Health Radiation Research, National Centre for Radiation Research and Technology, Cairo, Egypt

,

Asmaa Aly Yassen

³Conservative Dentistry Department, Faculty of Dentistry, Cairo University, British University in Egypt, Cairo, Egypt

› Author Affiliations

Abstract

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; 1^st group: Application of Filtek Z350 nanocomposite material, 2^nd group: As the 1^st group and then exposure to gamma radiation, 3^rd group: Application of Ketac N100 nanoglass ionomer, and the 4^th group: As the 3^rd 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

Full Text

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