Posts for: February, 2019
With all the new tooth-colored fillings for cavities, it's easy to overlook metal amalgam. While this mainstay of dental care for over a century might not be as attractive as composite resins or glass and resin ionomers, it still has the advantage of strength and durability.
Amalgam is a stable metal alloy usually made up of silver, tin, copper and mercury. The metals are proportioned and mixed precisely to guard against “free” mercury molecules, which could pose a health hazard. The mixture is pliable at first, but then sets hard once molded into the prepared area of the tooth.
Besides strength, amalgam's other advantages include low cost, high resistance to wear and biocompatibility (not toxic to the body or allergy-producing). At the same time, it can require more tooth structure removal to accommodate a filling and cause higher sensitivity to temperature for a while after installation. Its main disadvantage, however, is appearance — it's now considered unacceptable from an aesthetic point of view to use it in visible areas like the front teeth.
Because of this, materials resembling natural tooth color are coming into vogue, especially as their strength improves. Still, dental amalgam continues to play a useful role, especially in less visible back teeth with higher chewing forces.
One past concern about dental amalgam is the inclusion of mercury in the alloy. As mentioned before, mercury is hazardous in a “free” form when not knit microscopically with other metals; as such it can emit a vapor that could enter the bloodstream and damage the nervous system. But after several studies by various organizations, the American Dental Association has concluded amalgam's precise mixture prevents the mercury from taking this form: although some vapor is given off during chewing it's far too low in concentration to pose any danger.
Dental amalgam continues to be an effective choice for fillings. Whether it's the right choice for you will depend on the type and location of a tooth to be filled, and whether durability is a higher concern than appearance. If we do recommend an amalgam filling, you can be assured it's a safe and lasting choice.
If you would like more information on your choices for dental fillings, please contact us or schedule an appointment for a consultation. You can also learn more about this topic by reading the Dear Doctor magazine article “Silver Fillings — Safe or Unsafe?”
Canker sores, known medically as aphthous ulcers, are fairly common among people. Lasting for about a week or so, these mouth sores are usually more irritating than painful. But about a quarter of the population, especially women, frequently suffer from an acute form that doesn't often respond well to over-the-counter remedies.
A typical canker sore is usually round with a yellow-gray center ringed by a reddened "halo." They can be preceded by tingling or painful sensations at the site a few hours or so before breaking out. Recurrent aphthous stomatitis (RAS) is the more severe form of canker sore, often with outbreaks of multiple painful sores. While the more common sore is usually less than a centimeter in diameter, RAS sores are often much larger.
Canker sores often arise during periods of stress or anxiety, and seem to be connected with eating certain acidic foods like tomato sauce, citrus fruits or spicy dishes. RAS also seems to be related to underlying systemic conditions like vitamin deficiencies, anemia or digestive disorders. Besides managing diet and stress, people with regular canker sores and milder cases of RAS can often find relief with non-prescription numbing agents often found in stores and pharmacies.
For more severe RAS, though, you may need the help of your dentist or physician with treatments like prescription steroids or other medications that come in gel or rinse form or through injections. The goal of any treatment approach is to decrease pain severity and shorten healing times after an outbreak.
While most mouth sores, including RAS, aren't dangerous to your health, you should still take any sore seriously. You should especially seek medical evaluation if a sore doesn't heal after a couple of weeks, if they seem to come more frequently and are more severe, or if you don't seem to ever be without a sore in your mouth. These could indicate a serious underlying problem that needs to be addressed.
One thing's for sure: there are ways to ease your suffering if you have frequent bouts with regular canker sores or even RAS. Talk to your dentist about ways to minimize your discomfort from these irritating mouth sores.
If you would like more information on aphthous ulcers or canker sores, please contact us or schedule an appointment for a consultation. You can also learn more about this topic by reading the Dear Doctor magazine article “Mouth Sores.”
When your mouth is dry, you know it: that sticky, uncomfortable feeling when you first wake up or when you're thirsty. Fortunately, it usually goes away after you eat or drink. But what if your mouth felt like that all the time? Then, it's no longer an irritation—chronic dry mouth could also increase your risk of dental disease.
Chronic dry mouth occurs because of inadequate saliva flow. Saliva plays an important role in preventing dental disease because it neutralizes acid, which can cause the mineral content in tooth enamel to break down and lead to tooth decay. The mouth becomes more acidic right after eating, but saliva can restore its normal pH levels in about an hour—as well as some of the enamel's lost mineral content. Without saliva, your tooth enamel is at greater risk from acid.
While a number of things can potentially interfere with normal saliva production, medication is the most common. More than 500 prescription drugs, including many antihistamines, diuretics or antidepressants, can cause dry mouth. Cancer radiation or chemotherapy treatment and certain metabolic conditions like diabetes or Parkinson's disease can also increase symptoms.
If you are experiencing unusual dry mouth symptoms, see your dentist first for a full examination. Your dentist can measure your saliva flow, check your prescriptions and medical history, and examine your salivary glands for abnormalities. With this more accurate picture of your condition, they can help direct you to the most effective remedies and treatments for the cause.
If medication is the problem, you can talk to your doctor about alternative prescriptions that have a lesser effect on saliva flow. You can also drink more water before and after taking oral medication and throughout the day to help lubricate your mouth. Chewing gums or mints with xylitol, a natural alcohol sugar, can also help: xylitol helps reduce the mouth's bacterial levels, as well as stimulate saliva flow.
Easing your dry mouth symptoms can make your life more pleasant. More importantly, it can reduce your risk of future dental problems caused by a lack of saliva.
If you would like more information on dealing with chronic dry mouth, please contact us or schedule an appointment for a consultation. You can also learn more about this topic by reading the Dear Doctor magazine article “Dry Mouth: Learn about the Causes and treatment of this Common Problem.”