Prezi 1
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This document provides a history and comparison of manual and electric toothbrushes. It outlines the evolution of toothbrushes from chewing sticks around 3500 BC to modern electric toothbrushes. Key developments include the first mass-produced toothbrush in 1780 in England, the first American patent in 1857, and mass production beginning in the US in 1885. The first electric toothbrush was introduced in 1960. The document compares manual and electric toothbrushes, noting pros and cons of each such as cost, ease of use, and features. It traces the development of electric toothbrushes from simple models in the 1930s/1940s to rechargeable cordless and rotary options introduced in later decades.
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3) The group will come up with 5 reasons why the selected invention is important and cannot live without.
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19 Inventions.ppt
New inventions transformed daily life in the United States in the late 19th century. The number of patents granted increased dramatically from an average of 60 patents per day in 1897 to over 21,000 patents by the end of that year. Important innovations like the telephone, light bulb, cash register, and assembly line helped businesses and the American economy grow as new technologies were developed and adopted. Inventions that improved communication and transportation especially benefited businesses that traded overseas.
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- In 1901, William Rollins published over 200 articles warning about the potential dangers of x-rays and advocated for precautions when using them.
- In 1937, Bernard Fantus opened the world's first blood bank and coined the term.
- In 1955, Michael Buonocore described the acid etch technique, laying the foundation for dental bonding.
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The document provides instructions for a group assignment where students will be split into groups to discuss and present on important inventions. Each group will:
1) Brainstorm inventions they cannot live without and write down 5 on a dry erase board.
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- The earliest complete dentures date back to around 1500 AD and were made of carved bone. Early bases were made of materials like ivory, wood, and gold.
- In the 1700s, wax impressions and plaster casts allowed for more accurate denture fabrication. Porcelain and ivory bases were used but deteriorated over time.
- Vulcanite, discovered in 1839, became popular in the late 1800s as it was cheap and accurately reproduced plaster casts. It remained the standard until the 1900s.
- Acrylic resins like PMMA were introduced
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Brackets are an important part of orthodontic appliances. They have evolved over time from early metal bands to today's variety of materials like ceramics and plastics. Edward Angle is considered the father of modern orthodontics for developing the edgewise appliance in the early 1900s, which used identical brackets on all teeth. Over subsequent decades, orthodontists like Tweed and Andrews further refined the bracket and wire systems to allow for more precise tooth movement. Modern brackets continue to be improved through new materials and surface treatments to reduce friction and bacterial adhesion.
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Prezi 1
- 1. A New Insight into tooth care devices Demystifying the Toothbrush
- 2. Outline • Background & history of the development of toothbrush • Manual VS Electric: Comparative analysis • Contemporary approach for daily tooth care. Which is better? • Q & A
- 3. Manual VS Electric 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2007 2009 2011 electric manual
- 4. Evolution of the Toothbrush The chewing sticks (around 3500 BC) 1498 – 1938
- 5. Interesting facts • The first mass-produced toothbrush was made by William Addis, England, around 1780 • The first American to patent a toothbrush was H.N.Wadsworth on Nov.7, 1857 • Mass production of toothbrushes began in America around 1885 • The first electric toothbrushes was in 1960 in the United States ( the Broxodent) • There exist over 3000 toothbrush patents today
- 6. 1960 – 1987
- 7. From Manual to Electric • 1938 DuPont manufactured the first nylon bristle toothbrushes • 1939 (Switzerland) – the first simple electric toothbrush • 1960s (USA) – a rechargeable cordless toothbrush. • 1987 – the first rotary electrical toothbrush
- 8. Manual Toothbrush Inexpensive Easy grip handle Some come with a tongue scraper Variety of bristles Easy to travel Pros No built in timer Can be difficult for some people ( hand fatigue, health disorders, etc) Cons
- 9. Electric Toothbrush Ergonomic handles/rotary or/-non- head Timer/ Music Dispense toothpaste Pros Expensive Require charging or battery replacement Cons
- 12. “Complex is less perfect than simple”. Plotinus
Editor's Notes
- Russia