T. Kirk Crane, D.D.S.
Suite A
Lafayette, LA 70503
(337) 232-9110 fax
(800) 773-0930
My Blog
Posts for: February, 2012
When you have your teeth bleached in a dental office, the results almost seem like magic. Let's push aside the magician's cape and see what is really happening in professionally-applied, in-office tooth whitening.
How do teeth become discolored?
A tooth's enamel covering is mostly composed of mineral crystals. At a microscopic level, you can see a framework or matrix of organic (living) matter interspersed between the crystals of enamel creating a very irregular surface capable of retaining stains. Chromagenic (color generating) organic compounds can become part of this organic matrix resulting in tooth staining. They can be bleached without affecting the mineral structure of the tooth's enamel.
As people get older and their teeth wear, the enamel loses its youthful translucency and the underlying layer, called dentin, thickens and becomes more yellow. Such changes to the actual tooth structure are called intrinsic staining. Other causes of intrinsic discoloration are exposure to high levels of fluoride or tetracycline antibiotic administration during childhood, tooth decay, or root canal problems, among others. Discoloration can also be caused by external staining from certain foods, drinks, or tobacco products. Such surface stains are called extrinsic staining.
Behind the Magic
Materials used for tooth bleaching are hydrogen peroxide and carbamide peroxide. Peroxides are commonly used as bleach, and you may have seen them used as hair bleaches, for example. Hydrogen peroxide is a strong oxidizing agent that attacks the organic molecules responsible for tooth discoloration, bleaching them until they lose their color. Carbamide peroxide also contains urea, which is a compound that permits the peroxide to remain in contact with the teeth for longer amounts of time without harming them.
Often called power bleaching, the in-office technique uses a high concentration of peroxide solution (35-45% hydrogen peroxide), placed directly on the teeth in the form of a gel. A heat or light source may enhance the peroxide release. The gel is applied with trays custom fitted to your mouth, and specific barriers are applied to protect sensitive gum tissue from the solution. Results show teeth becoming up to ten shades lighter in about an hour.
In-office bleaching under the supervision of my staff and me is recommended if you have severely stained teeth, and particularly if you are about to have veneers or crowns made. It's a way to rediscover the pearly translucency of your youthful smile.
Contact us today to schedule an appointment to discuss your questions about tooth bleaching. You can also learn more by reading the Dear Doctor magazine article “Teeth Whitening.”
Protecting your children is one of your most important roles as a parent or caregiver. Dental sealants are one way you can protect your children's teeth from the ravages of tooth decay, drilling and fillings — and they can be applied simply, comfortably and quickly right here in our office.
What is a dental sealant?
A dental sealant is a thin, plastic film that is painted onto the tiny grooves on the chewing surfaces of the back teeth (usually the premolars and molars) to prevent caries (cavities) and tooth decay. And by allowing us to use sealants to seal these little nooks and crannies where your child's toothbrush can't reach, you will dramatically reduce their chances for developing tooth decay. This one, simple and quick office visit could save you both money and time with fewer dental visits and healthier, cavity-free teeth.
So will sealants guarantee no (or no more) cavities?
No, just like life, there are few guarantees. Your child's oral hygiene, regular dental visits, fluoride, sugar consumption and genetics are the other important factors that will determine to what degree your child experiences tooth decay. However, research shows that pit and fissure (chewing surface) decay accounts for approximately 43% of all decayed surfaces in children aged 6 to 7, even though the chewing surfaces (of the back or posterior teeth) constitute only 14% of the tooth surfaces at risk. This demonstrates the vulnerability of the chewing surfaces of the posterior teeth to decay. By placing a protective seal over the areas of teeth at risk, you can effectively and proactively protect your children's teeth.
How long do sealants last?
Research has shown that some sealants can last up to 10 years. However, if you opt for sealants for your children's teeth, we will closely monitor them with each office visit to ensure that they are still doing their job. As needed, we can apply more sealant.
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