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Oral and Dental Medicine

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Browsing Oral and Dental Medicine by Author "Abdou, Alaa Samy Mahmoud ELSayed,"

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    The Efficacy of Wear a CAD/CAM Hybrid Ceramic Restoration on Color Stability : An In Vitro Study /
    Abdou, Alaa Samy Mahmoud ELSayed,; Supervisor : Omaima El Mahallawi, Lomaya Ghanem.
    Over the past two decades, the interest and demand for esthetic restorative materials increased for dentists as well as patients. This lead to the popularity of dental ceramics in dentistry, due to their biocompatibility, low plaque accumulation, superior esthetics, color stability, chemical inertness, good compressive strength and abrasion resistance. However, dental ceramics have some major disadvantages including low tensile and flexural strength making the material brittle and subjected to fracture, and being abrasive to the opposing natural dentition due to difference in wear resistance compared to the natural tooth enamel. When a ceramic restoration surface texture is altered by wear, it results in formation of a rough discolored surface that collects debris leading to loss of initial esthetic color and wearing of opposing dentition. Thus the excessive differential wear of teeth and ceramic materials has harmful effects on the biological, functional and esthetic condition of the masticatory system. Therefore the mechanical and the tribological properties of dental restorative materials are considered the uppermost challenges in the dental field in conjugation with the esthetic and artistic demands. Advances in digital impression technology and fabrication processes have led to a dramatic paradigm shift in dentistry and to the universal use of computer-aided design/computer-aided manufacturing (CAD/CAM) in the construction of indirect esthetic dental restorations. Most recent monolithic CAD/CAM blocks improved the physical and chemical properties of dental materials, by producing restorations that are homogenous, dense, porosity free, where complicated anatomies are controlled by the machining process eliminating human error and saving time. The current progresses in technology facilitated the innovation of monolithic CAD/CAM hybrid ceramic restorations, which are mainly composed of ceramic fillers that are enclosed in a polymer matrix. These monolithic blocks are prepared with accurate ceramic-to-resin ratios and evenly distributed ceramic particles. Hybrid ceramics combined the properties of dental ceramics and resin composites in a single restoration. They have the durability, long lasting esthetics, surface gloss and finish retention of dental porcelain along with the ease of handling, improved flexural strength and wear kindness of composite resin material. This research aims to evaluate, the wear efficacy of a CAD/CAM hybrid restoration on color stability.