The Effect Of Gamma Radiation On In-Vitro Performance Of Laminate Veneers Fabricated From Two Esthetic MaterialsRania Hosny Mohamed Abd El Rahman
AbstractOne of the most conservative methods for restoring the appearance of discolored, pitted teeth and teeth with midline diastemas is laminate veneers. Radiotherapy is a therapy aiming to exterminate abnormal cells to decrease or eliminate the tumor of the head–neck region, breast, and sarcomas of soft tissues of the extremities. The irradiation dosage in the head and neck region usually ranges between 40 and 70 Gy. However, this procedure might cause side-effects to normal tissues and restorations neighboring the affected area. The aim of this study was to evaluate the effect of gamma irradiation at therapeutic dose on color, surface roughness, marginal adaptation and microleakage of two CAD/CAM esthetic ceramic materials (IPS e-max, lava ultimate). Thirty human central incisors free of caries and restoration was selected for this study, the teeth were divided into three groups according to the exposure protocol and testing into: n=10 Group A: teeth were irradiated with gamma radiation after preparation and cementation of the laminate veneers, this group was tested for color stability and surface roughness before and after exposure to gamma radiation (post-cementation irradiation group).
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