Browsing by Author "Zidan A."

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    Is chlorhexidine-methacrylate as effective as chlorhexidine digluconate in preserving resin dentin interfaces?
    (Elsevier Ltd, 2016) Abu Nawareg M.; Elkassas D.; Zidan A.; Abuelenain D.; Abu Haimed T.; Hassan A.H.; Chiba A.; Bock T.; Agee K.; Pashley D.H.; Department of Restorative Dentistry; Faculty of Dentistry; King Abdulaziz University; Jeddah; Saudi Arabia; Biomaterials Department; Faculty of Oral and Dental Medicine; Cairo University; Egypt; Department of Operative Dentistry; Faculty of Oral and Dental Medicine; Misr International University; Cairo; Egypt; Dental Biomaterials Division; Faculty of Dentistry; Umm AlQura University; Mekkah; Saudi Arabia; Department of Dental Materials; Faculty of Dentistry; October University for Modern Sciences and Arts (MSA); Egypt; Department of Orthodontics; Faculty of Dentistry; King Abdulaziz University; Jeddah; Saudi Arabia; Department of Cariology and Operative Dentistry; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo; Japan; R&D Adhesives; Ivoclar Vivadent AG; Schaan; FL9494; Liechtenstein; Department of Oral Biology; Georgia Regents University; College of Dental Medicine; Augusta; GA; United States
    Objectives The aim of the current study was to evaluate the effect of 2% CHX and 2% CHX-methacrylate compared to the resin dentin bonds created by a two-step etch-and-rinse adhesive system after 24h, 6min and 12min. Methods Microtensile bond strengths and interfacial nanoleakage within resindentin interfaces created by Adper Single Bond 2, with or without CHX or CHX-methacrylate pre-treatment for 30s on acid-etched dentin surfaces, were evaluated after 24h, 6min and 12min of storage in distilled water at 37C. Results Twelve months of storage resulted in a significant decrease in microtensile bond strength in the control group, and significant increases in silver nanoleakage. In contrast, Single Bond 2+CHX, and to a greater extent CHX-methacrylate, significantly reduced the rate of deterioration of resindentin interfaces over the 12min water storage period, in terms of bond strength. Conclusions Similar to Single Bond 2+CHX, Single Bond+CHX-methacrylates reduced the degradation of resin-bonded interfaces over a 12 month storage period. Thus it can be concluded that Single Bond 2+CHX-methacrylate may be important to improve durability of bonded interfaces and therefore, prolong the life span of adhesive restorations. Clinical significance Although CHX primers have been shown to enhance the durability of etch-and-rinse adhesives, that protection is lost after 2h. The use of CHX-methacrylate should last much longer since it may copolymerize with adhesive monomers, unlike CHX. 2015 Elsevier Ltd
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    Role of dentin cross-linking agents in optimizing dentin bond durability
    (Elsevier Ltd, 2017) Abunawareg M.; Abuelenain D.A.; Elkassas D.; Haimed T.A.; Al-Dharrab A.; Zidan A.; Hassan A.H.; Pashley D.; King Abdulaziz University Faculty of Dentistry; Jeddah; Saudi Arabia; Faculty of Oral and Dental Medicine; Misr International University; Cairo; Egypt; Faculty of Dentistry; Umm Alqura University; Mekkah; Saudi Arabia; Faculty of Dentistry; October University for Modern Sciences and Arts (MSA); Cairo; Egypt; Faculty of Oral and Dental Medicine; Cairo University; Cairo; Egypt; The Dental College of Georgia at Augusta University; Augusta; GA; United States
    The present work compared the effects of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC-HCl) and ultraviolet (UV)- or blue light-activated riboflavin cross-linking agents on resindentin micro-tensile bond strength and nanoleakage in bonds produced using a two-step, etch-and-rinse adhesive after three storage intervals (24 h, 6 months, and 12 months). Forty eight extracted human third molars were used to investigate micro-tensile bond strength and interfacial nanoleakage in resin�dentin bonds created using Adper Single Bond 2, with or without pretreatment of acid-etched dentin surfaces. Either 0.5 M EDC-HCl or 1% riboflavin-5-phosphate activated by blue or UV light were used as cross-linking agents. Samples were evaluated after storage for 24 h, 6 months, or 12 months in distilled water at 37 �C. Statistical analyses revealed that 12 months of storage resulted in significant decreases in the bond strength of the controls (p < 0.003), with significant increases in their silver nanoleakage (p < 0.05), compared with the groups subjected to dentin pretreatment with either EDC-HCl or light-activated 1% riboflavin. Despite the significant drop in bond strength after 6 months� storage in all experimental groups compared with the 24-h bond strength (p < 0.05), there was a further non-significant drop in bond strength after 12 months in samples treated with EDC-HCl and UV-activated 1% riboflavin (p > 0.05). Dental collagen cross-linking induced by UV- or blue light-activated 1% riboflavin or EDC-HCl enhanced the durability and strength of the resin�dentin bond. � 2017