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- at 11:55:11RSS Feed | Really Simple Syndication

dental , curing light
There are numerous manufacturers in providing some type of hardness disc to verify that a dental curing light will polymerize a specific thickness of composite in a specified amount of time. Most of these discs have a small hole in the center. For this test, you fill the hole in the disc with the composite, cure it for a specified time period, and then turn over the disk to check whether the bottom surface of the cured composite “feels” like the disc when scratched with an explorer or other sharp instrument. If it does, then this presumably indicates the composite is adequately cured for intraoral use.

However, this is a dangerous test that could give you false and misleading information. Consider what we found with the Demetron Hardness Tester, which is essentially a round white plastic disc with three holes. We filled the three holes in the disc with our test composite and cured each composite specimen 5 seconds, 10 seconds, or 40 seconds.

We then turned over the disk and tested the bottom of each cured composite disc as well as the Hardness Tester itself for Knoop hardness. Finally, we asked three of our research staff to scratch the bottoms of the specimens with a sharp explorer and compare the “feel” to that of the Hardness Tester.

Many directions include some strange safety measures such as using the light for 20 seconds and letting it rest for 60 seconds. Another one tells you not to use the light if the patient is on N2O/O2. These stipulations are mandated by various government regulations and manufacturers must comply if they want to sell the product internationally. Don’t let these warnings stop you from using the lights in a normal manner.

On the other hand, with LEDs that do not have fans, you are typically advised to limit their continuous use to several minutes and then allow them to cool off. While we have subjected these lights to extended curing tests and many of them have passed these tests, it is probably prudent to heed this type of warning and not subject the equipment to heat challenges that can shorten their useful lives.
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- at 11:32:41RSS Feed | Really Simple Syndication

root canal , pulp
Local anesthesia is administered via injections to numb the tooth to be treated and the surrounding tissues. If the pulp in a tooth is acutely inflamed, and therefore very painful, it may take a while to get it numb, but your dentist will not start the treatment until it is.

The diseased and dead pulp tissue is removed from the tooth with specially designed instruments used to clean out the root canals and pulp chamber. This is not painful; the area is numb and the tissue being removed is either dead or dying. Once the pulp, along with the nerves contained in it, is removed, the tooth itself can no longer feel pain.

Root canal fillings are selected that will exactly fit into the freshly prepared canals. Usually a rubber-like material called gutta-percha is used to fill the canal space. It is a thermoplastic material (“thermo” – heat; “plastic” – to shape), which literally is heated and then compressed into and against the walls of the root canals to seal them. Together with adhesive cement called a sealer, the gutta-percha fills the prepared canal space. Sealing the canals is critically important to prevent them from becoming reinfected with bacteria.

A temporary or permanent filling material will then be placed to seal the access hole that was made to treat the canals, and the dental dam is removed. If the tooth lacks sufficient structure to hold a restoration (filling) in place, the dentist or endodontist may place a post (either metal or a very strong plastic) in one of the canals inside the tooth to help retain it.

Your tooth will need a permanent restoration — a filling or a crown — to replace lost tooth structure, and provide a complete seal to the top of the tooth. Your endodontist will send you back to your general dentist to determine which type of restoration is best for you. This step is of particular importance since many studies show that if the filled root canals(root canal treatment equipment) are recontaminated with bacteria from the mouth, there could be a recurrence of infection around the tooth.
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- at 10:43:23RSS Feed | Really Simple Syndication

tooth , dentist , crown
To repair a cracked tooth, a dentist may need to either administer a crown or a filling. The type of treatment used typically depends on the severity of the crack. Minor surface cracks are fairly normal for most people, and these can usually be buffed and polished by a dentist to make them less noticeable.

When a tooth has cracked completely in two, a dentist will normally need to assess the damage to determine whether he should fix it with a crown or a filling. A crown may be necessary to repair a severely cracked tooth, while cracks that are minor may be treated with fillings.

The primary problem with teeth that are cracked in two pieces and left untreated is that the cracks will likely get much worse over time. This tends to happen in much the same way as a cracked windshield in a car. The crack will typically spread until the entire tooth breaks off into two pieces. In most cases, the crack encompasses the entire tooth from the nerve up to the surface. A root canal might be necessary to repair a cracked tooth in a person who has a tooth crack that spreads to the nerves of her teeth.

A person who has a minor surface crack, which is often called a craze line, will not normally require treatment from a dentist. Some people do choose to have surface cracks polished by a dentist so that they are not noticeable, but this isn't always necessary. These small surface cracks affect only the enamel of the tooth and do not normally cause any discomfort. Some people may be able to feel rough spots caused by these surface cracks on their teeth with their tongues. Having surface cracks buffed and polished by a dentist should not only make the cracks less noticeable, but might also take away the rough spots( teeth whitening machine).

To repair a cracked tooth, a dentist will have to assess the damage so she can determine which type of treatment is best. Crowns may be very helpful for teeth that have major cracks because they can normally prevent the cracks from spreading. Fillings are usually helpful for minor cracks, but these may need to be redone over time if cracks start to spread. A person might want to repair a cracked tooth with a filling for a temporary quick fix. Fillings might also be a good option for a person who cannot afford a crown, because fillings are typically less expensive than crowns.
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- at 09:59:00RSS Feed | Really Simple Syndication

When was the last time you gave any thought to your vacuum system? Probably not once since it was bought and installed and probably not again until it needs replacement. Do you ever hear your suction(dental suction unit), smell your suction, does it ever produce inadequate force to allow all the practitioners in the practice to operate effectively at the same time? Traditional wet vacuum systems are loud, smelly (both from the burnt oil and the debris that is trapped in the tanks for an extended period of time) and use massive amounts of water, up to 200,000 gallons per year, equal to an Olympic size swimming pool worth of water every month. Not only is this an environmental concern, but a major financial sinkhole as well.

Averaged over North America, the water required to run a wet vacuum system can cost approximately $2,000 per year. This accounts for the incoming costs only; some communities are beginning to legislate what they consider excessive waste water release, taxing effluents. Thus, the dentist with a wet vacuum system is hit with a double water bill, once on the way in, and again on the way out. Since, a dry vacuum system does not require the water that wet systems do, there is a very positive financial impact (in addition to the environmental one) in switching to the newer technology when the old system needs to be replaced.

The recent introduction of various dry vacuum systems eliminates these concerns and provides excellent clinical vacuuming power. The concerns of retro-fitting a new unit center on practicality and cost. The replacement dry system should be no larger than the existing wet one, and should preferably provide more suction capacity for the practice. Other parameters include reduction of noise and the drainage requirements; most wet system traps must be drained on a regular basis, a task usually allotted (due to its popularity) to the staff member with the least seniority.

Both systems work well for dentistry. However, a new wet vac creates up to 15″ Hg suction pressure while a new dry vac (some but not all) creates up to 25″ Hg. This provides the power and performance that the dentist expects from the vacuum system. This is probably the single most important factor to consider when selecting a new vacuum and should be carefully researched. (Some dry vacs produce only 8″ Hg suction pressure.)
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