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Shear Bond Strength Evaluation of Composite versus Glass Ionomer Cement Over One Year

2020
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Metric Options:   Counts1 Year3 Year

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Role and Significance of Restorative Dental Materials1Composite resin is a widely used restorative material, because of its esthetic properties, biocompatibility, and more importantly its low environmental impact.The properties of a restorative material require significant durability, strength and withstand degradation of the restoration when subjected to different factors in the oral cavity. The oral environment is a complex environment where a restorative material must be able to sustain against bacteria, changing pH, temperature, masticatory forces and saliva etc. The oral cavity is considered to be the harshest environment for a dental material in the body.Glass ionomer cements (GIC) are the only direct restorative material to bond chemically to dental hard tissues due to the formation of ionic bonds between carboxylate groups and calcium. The propertities of GIC include adhesion to moist tooth structures, anticariogenic properties due to release of fluoride, thermal compatibility with tooth enamel, biocompatibility and low toxicity. The use of GICs in a mechanically loaded situation, however, has been hampered by their low mechanical performance. Poor mechanical properties, such as low fracture strength, toughness and wear, limit their extensive use in dentistry as a filling material in stress-bearing applications. In the posterior dental region, glass ionomer cements are mostly used as a temporary filling material. The requirement to strengthen those cements has led to an ever-increasing research effort into reinforcement or strengthening concepts.Shear Bond Testing is an established method to evaluate the bond strength between dental hard tissue and restorative materials.2, 3

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