Air conditioning system failure is a common problem in many older automobiles. As an air conditioning system ages, systems can begin to lose pressure due to the failure of dried out gaskets or corroded metal. When the freon in the system leaks out, the air conditioning system will not be able to properly cool the air and eventually the system will stop working altogether.
When an air conditioning system begins to fail, the system should be physically inspected for problems. With the engine off and cool, a car owner should visually inspect all aspects of the system for problems. There are 3 major parts to an air conditioning system: the evaporator, the pulley driven compressor and the condenser which resembles a small radiator. These three major parts are connected by a series of metal tubes and hoses. All of these should be inspected for damage. Significant damage may indicate that the parts need to be replaced.
If no serious physical damage is found, the system pressure should be checked with a pressure gauge and compared against the manufacturer's recommended system pressure. If the system is found to be low, then there is a leak in the system. Auto part stores sell numerous leak detection products that contain a dye that will mark the location of the leak. Once the leak detection dye has been added and the system has been allowed to operate, a UV light is used to find the location of the leak. Any UV light can be used, but small ones are made for this purpose that can be used in the tight spaces around the air conditioning system components.
When the leak has been found, there are two primary ways of fixing it: mechanical repair or a stop leak product. Mechanical repairs are often time consuming and costly as after the part is replaced, the system pressure has to be brought to vacuum by specialized equipment to remove moisture. Stop leak products are much easier to use. These products are injected into the system and allowed to work internally. For example, BlueDevil's Red Angel AC Stop Leak is a stop leak product that will seal leaks due to damaged gaskets as well as leaks from corroded metal. When used according to manufacturer directions, stop leak products are safe to use and can result in significant time and financial savings.
Tuesday, August 23, 2016
Monday, August 8, 2016
How do dentists number teeth?
The most widely used system for numbering teeth is the Universal Numbering System.
The number 1 tooth is located in the back-right side of your mouth on the upper jaw. The numbering continues on the upper jaw, from the right to left side, which is numbered 1 through 16. The numbering then continues by dropping down from the left side to number 17. Your teeth are then numbered from left to right on your bottom jaw, ending in 32. If you are missing your third molar, your teeth will be numbered starting with 2 instead of one, and If you are missing any other teeth, they will still be numbered.
What material is used to fill a cavity?
Gold fillings are often seen as the best cavity solution. They do not harm the gums and can last up to 20 years. The downside of gold fillings is that they are expensive and can require many dental visits.
Amalgam fillings or silver fillings are used commonly because of their cheap price, and resistance to wear. They are more noticeable than other cavity treatment options which are why many people will only use them for their back teeth.
Composite resins are widely used when people are looking for something that will match their natural tooth color. Unfortunately, composite resins do not last very long and can easily stain from coffee, tea, etc.
To fill a root canal dentists typically use a rubbery material called gutta-percha. To fill the canal space, gutta-percha is heated and compressed to seal the walls of the root canal. With cement as an adhesive seals the canal space and prevents it from becoming infected once again.
How do dentists attach braces?
Dentists cannot attach traditional braces but can apply ClearCorrect braces, which are used for patients who only need mild tooth correction. Your dentist will take impressions and x-rays of your teeth to find the perfect fit. You will be able to preview your projected results to give yourself an idea of what your future teeth will look like. After digitally mapping and molding your aligners, you will then be able to wear your braces.
What do dentists use to numb your mouth?
The most commonly used way to numb teeth is anesthesia, which is injected into a patient’s inner cheek or gums. The typical anesthetic that dentists use is called lidocaine. In addition to lidocaine, drugs such as vasoconstrictor as often used to narrow the blood vessels, making the numbness last longer. Sodium hydroxide and sodium chloride may be used as well to assist the numbing drug.
Numbing injections work in two ways. The first is a blockinjection which numbs a portion of your mouth, such as you one side of your upper jaw. The second option is an infiltration injection, which numbs a small area of your mouth where the injection was given.
Before injecting the numbing agent, your dentist will dry your mouth with a cotton ball or air. Your dentist will then apply a gel to numb the skin.
Next your dentist will inject the local anesthesia, which will give you a sting. This mild sting is not from the needle puncturing the skin, but from the anesthesia moving through the tissue. Once injected, the anesthesia will last several hours.