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Poor aesthetics -- silver fillings don't match the color of natural teeth. Destruction of more tooth structure -- healthy parts of the tooth must often be removed to make a space large enough to hold the amalgam filling.
Discoloration -- amalgam fillings can create a grayish hue to the surrounding tooth structure. Cracks and fractures -- although all teeth expand and contract in the presence of hot and cold liquids, which ultimately can cause the tooth to crack or fracture, amalgam material -- in comparison with other filling materials -- may experience a wider degree of expansion and contraction and lead to a higher incidence of cracks and fractures.
The mercury contained in the amalgam releases low levels of mercury in the form of a vapor that can be inhaled and absorbed by the lungs.
High levels of mercury vapor exposure are associated with adverse effects in the brain and the kidneys. Continued Tooth-colored Composites Advantages of composites: Composites are particularly well suited for use in front teeth or visible parts of teeth.
Bonding to tooth structure -- composite fillings actually chemically bond to tooth structure, providing further support. Versatility -- in addition to use as a filling material for decay, composite fillings can also be used to repair chipped, broken, or worn teeth.
Tooth-sparing preparation -- sometimes less tooth structure needs to be removed compared with amalgam fillings when removing decay and preparing for the filling. Lack of durability -- composite fillings wear out sooner than amalgam fillings lasting at least five years compared with at least 10 to 15 for amalgams ; in addition, they may not last as long as amalgam fillings under the pressure of chewing and particularly if used for large cavities.
Increased chair time -- because of the process to apply the composite material, these fillings can take up to 20 minutes longer than amalgam fillings to place. Additional visits -- if composites are used for inlays or onlays, more than one office visit may be required.
Chipping -- depending on location, composite materials can chip off the tooth. Expense -- composite fillings can cost up to twice the cost of amalgam fillings.
In addition to tooth-colored, composite resin fillings, two other tooth-colored fillings exist -- ceramics and glass ionomer. Other Filling Types Ceramics. These fillings are made most often of porcelain, are more resistant to staining than composite resin material but are also more abrasive. This material generally lasts more than 15 years and can cost as much as gold. Glass ionomer is made of acrylic and a specific type of glass material.
This material is most commonly used for fillings below the gum line and for fillings in young children drilling is still required. Glass ionomers release fluoride, which can help protect the tooth from further decay. However, this material is weaker than composite resin and is more susceptible to wear and prone to fracture.
Glass ionomer generally lasts five years or less with costs comparable to composite resin. The newest ones have an even better lifespan and, when placed in appropriate areas.
Most dental insurance plans cover the cost of the composite fillings up to the price of the silver filling, then the patient may have to pay the difference.
What Are Indirect Fillings? Indirect fillings are similar to composite or tooth-colored fillings except they are made in a dental laboratory and require two visits before being placed. Indirect fillings are considered when not enough tooth structure remains to support a filling but the tooth is not so severely damaged that it needs a crown. During the first visit, decay or an old filling is removed.
An impression is taken to record the shape of the tooth being repaired and the teeth around it. The impression is sent to a dental lab that will make the indirect filling. A temporary filling described below is placed to protect the tooth while the restoration is being made. During the second visit, the temporary filling is removed, and the dentist will check the fit of the indirect restoration. Provided the fit is acceptable, it will be permanently cemented into place. There are two types of indirect fillings -- inlays and onlays.
Inlays are similar to fillings but the entire work lies within the cusps bumps on the chewing surface of the tooth. Onlays are more extensive than inlays, covering one or more cusps. Onlays are sometimes called partial crowns. Inlays and onlays are more durable and last much longer than traditional fillings -- up to 30 years. They can be made of tooth-colored composite resin, porcelain, or gold. Inlays and onlays weaken the tooth structure, but do so to a much lower extent than traditional fillings.
Another type of inlay and onlay -- direct inlays and onlays -- follow similar processes and procedures as the indirect, but the difference is that direct inlays and onlays are made in the dental office and can be placed in one visit. The type of inlay or onlay used depends on how much sound tooth structure remains and consideration of any cosmetic concerns.
Temporary fillings are used under the following circumstances: For fillings that require more than one appointment -- for example, before placement of gold fillings and for certain filling procedures called indirect fillings that use composite materials To allow a tooth's nerve to "settle down" if the pulp became irritated If emergency dental treatment is needed such as to address a toothache Temporary fillings are just that; they are not meant to last.
They usually fall out, fracture, or wear out within a month. Be sure to contact your dentist to have a temporary filling replaced with a permanent one. If you don't, the tooth could become infected or you could have other complications. Over the past several years, concerns have been raised about silver-colored fillings, otherwise called amalgam fillings. Because these fillings contain the toxic substance mercury, some people think they are responsible for causing a number of diseases, including autism, Alzheimer's disease, and multiple sclerosis.
The causes of autism, Alzheimer's disease, and multiple sclerosis remain unknown. Additionally, there is no solid, scientific evidence to back up the claim that if a person has amalgam fillings removed, he or she will be cured of these or any other diseases. Although amalgams do contain mercury, when they are mixed with other metals, such as silver, copper, tin, and zinc, they form a stable alloy that dentists have used for more than years to fill and preserve hundreds of millions of decayed teeth.
In June , the FDA said, "Dental amalgams contain mercury, which may have neurotoxic effects on the nervous systems of developing children and fetuses. The changes come in response to a lawsuit filed by consumer groups and individuals concerned about mercury exposure. To settle the suit, the FDA agreed to update its web site. To maintain fillings, you should follow good oral hygiene -- visiting your dentist regularly for cleanings, brushing with a fluoride toothpaste , flossing and using an antibacterial mouthwash at least once daily.
If your dentist suspects that a filling might be cracked or is "leaking" when the sides of the filling don't fit tightly against the tooth, this allows debris and saliva to seep down between the filling and the tooth, which can lead to decay , he or she will take X-rays to assess the situation.
If your tooth is extremely sensitive, if you feel a sharp edge, if you notice a crack in the filling, or if a piece of the filling is missing, call your dentist for an appointment. A tooth may be sensitive to pressure, air, sweet foods, or temperature. This was the behavior of Asterisk 1. If x is provided, specify the CallerID stored on the called channel. When the destination answers presumably an operator services station , the originator no longer has control of their line.
They may hang up, but the switch will not release their line until the destination party the operator hangs up. With mode set to 2, when the operator flashes the trunk, it will ring their phone back. This is basically Privacy mode without memory. P x - Enable privacy mode. You can also specify 0 or NONE to send no cause.
Indicate ringing to the calling party, even if the called party isn't actually ringing. Pass no audio to the calling party until the called channel has answered. Send audio 'tone' from the indications. Allow interruption of the ringback if early media is received on the channel. S x - Hang up the call x seconds after the called party has answered the call.
Works with the f option. This setting does not perform policy enforcement on transfers initiated by other methods. T - Allow the calling party to transfer the called party by sending the DTMF sequence defined in features. BUSY - Behave as if a busy signal was encountered.
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