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Pre-exposure prophylaxis (PrEP), is the use of medications to prevent the spread of disease in people who have not yet been exposed to a disease-causing agent. Vaccination is the most commonly used form of pre-exposure prophylaxis ; other forms of pre-exposure prophylaxis generally involve drug treatment, known as chemoprophylaxis .
In 1978, the first Dental Implant Consensus Conference was held, sponsored jointly by the National Institutes of Health and Harvard University. It was a landmark event, at which retrospective data on dental implants were collected and analyzed and criteria and standards for implant dentistry were established.
Panoramic radiograph of historic dental implants, taken 1978 There is archeological evidence that humans have attempted to replace missing teeth with root form implants for thousands of years. Remains from ancient China (dating 4000 years ago) have carved bamboo pegs, tapped into the bone, to replace lost teeth, and 2000-year-old remains from ...
The majority of dental implants are made of commercially pure titanium, which is available in four grades depending upon the amount of carbon, nitrogen, oxygen and iron contained. [22] Cold work hardened CP4 (maximum impurity limits of N .05 percent, C .10 percent, H .015 percent, Fe .50 percent, and O .40 percent) is the most commonly used ...
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The first form of PrEP for HIV prevention—emtricitabine and tenofovir disoproxil (FTC/TDF; Truvada)—was approved in 2012. [3] In October 2019, the U.S. Food and Drug Administration (FDA) approved the combination of emtricitabine and tenofovir alafenamide (FTC/TAF; Descovy ) to be used as PrEP in addition to Truvada, which provides similar ...
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