Cement

bonding mechanisms between materials and the dental structure. Mechanical retention is used when amalgam is placed, by securing it through undercuts, so that the floor is wider than the opening of the preparation. Composite materials or dental cements use a different type of retention, they use chemical adhesion or bonding. Dental materials…

In my family Christmas time is the best time of the year. We always gather together and celebrate with a big beautiful tree and great food. The one food that is always a must have is tamales. My great grandmother started this tradition in her house, located in Durango, Mexico, because it was the one and only food she could always get the youngest child to eat. The children always enjoy cheese stuffed tamales while the adults enjoy red pork tamales. While some food might have been cooked days…

was thrown from a horse when he was 44 and broke his hip. There were no doctors around so Sarah and John Toone had to set the hip. He was left with a limp for the rest of his life. For a time, he and his brother John worked down at the Red Devil Cement Plant and…

One sunny day in a small town called mission British Columbia just outside of abbotsford BC when i was about 7 if my memory serves me right, i was sitting on the couch watching Disney's Recess (My favorite kids show growing up) when my mom had called me from the driveway asking me to come outside and see something. I told her to wait because i wanted to finish the episode of Recess, but she told me to come now it was urgent so i went outside to find she had bought me a brand new bike. It was a…

wear it down, and can wear down the cement holding it in place. So be carefully when you eat nuts and other tough and hard foods. Grinding Your Teeth Grinding your teeth can have a whole host of negative consequences; when you grind your teeth, you expert more pressure on your teeth than they are meant to withstand. Prolonged grinding of your teeth can chip your crown. It can also cause your crown to fall out; all that extra pressure will wear down the cement holding your crown in place. If…

there. German pillboxes mounted with machine guns or other weapons would be waiting to fire at anything that moved. And for the ships that were coming in there were mines waiting to completely cripple the ships. When the allies got past the mines cement bunkers loaded with massive guns fired upon them. Finally when they got…

It is often believed that friendship is one of the most important parts of the human being. But what does the word 'friendship' mean? I think we cannot give a clear definition. For many of us it means something fun, gorgeous and beautiful. It is true that a real friendship can make a person the happiest person in the world, but at the same time friendship is hard work. People often claim that a good friend must always be honest, generous, reliable, tolerant, loyal, easy-going person. But this is…

Climate Change and Structural Engineers The sun is the main source of energy to the planet and annually it supplies the earth with certain amount of energy. Some of this energy is reflected back to space directly, but the rest that enters the planets is either absorbed by the atmosphere and earth surface or reflected back to space. However some of the energy is trapped by the atmosphere to warm the earth’s surface in a natural way. This phenomenon is called the ‘The Greenhouse Effect’ which is…

and Al Malty (2013), concrete made from 100% recycled coarse aggregate can achieve high compressive strength since large amount of cement to be added, which is therefore not an economical proposition. Still according to the author, concrete made with 50% or 100% of recycled coarse aggregates requires a reduction of 4% to 10% of the ratio a / c of 5% to 10% more cement than the conventional concrete to give it same compressive strength at 28 days of conventional concrete. For the lightweight…

In April of 2010, BP had a blowout in the Macondo well deep in the ocean. This disaster is said to be one of the worst environmental disasters in U.S. history. Although BP worked with the coast guard and tried to plug the hole multiple times, it took over 3 months to finally put a cap on the well stopping the oil spill, and almost 6 months to permanently seal the leaking well. It is estimated that a total of 4.4m barrels of oil were released into the Gulf of Mexico during the nearly three months…