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Over the past 20 years, the trend in dentistry has been in search of metal-free alternatives to replace many of the traditional restorative materials that have been used for decades in both direct and indirect applications. The introduction of new materials has provided options that did not exist previously. The ideal restorative material capable of solving the everyday challenges faced by today's dentists should possess physical, material, and optical characteristics similar to natural teeth, demonstrating the ability to sustain equivalent masticatory forces and wear resistance. Although the...

Statistics is the science whereby inferences are made about specific random phenomena on the basis of relatively limited sample material. Today statistics is widely employed in government, business, and all the sciences. Electronic computers have expedited statistical computation, and have allowed statisticians to develop "computer-intensive" methods Research is usually done to solve those questions which are still a puzzle for society. Research can help the human kind to find out new ways to lead healthy life style or how to cure deadly diseases and many more things which are an obstacle in...