Posts for: February, 2018
It takes a lot of skill, experience, talent and artistry to create tooth restorations that look so natural that no one can tell them apart from the originals. To do so requires understanding of the normal anatomy of a tooth as well as of the interactions of light and color.
How the anatomy of a tooth determines color
The color that we perceive when looking at a tooth results from the combined appearance of the tooth’s center core (dentin layer) and its covering enamel. Going from the outside in, the enamel is made of tightly packed crystals of calcium, which cause it to be one of the hardest substances naturally produced by animals. The crystals are also responsible for a tooth’s brilliance and translucence. The dentin is more like bone, a porous living tissue composed of microscopic tubes, interspersed with more calcium crystals. In the very center of the tooth is a central chamber containing the pulp and nerves.
Each of these layers has its own physical and optical properties. Since the enamel is translucent and the dentin is more opaque, most of the tooth’s color comes from the dentin and is transmitted through the enamel layer. Factors that affect this transmission include the thickness and age of the enamel as well as external tooth whitening.
If the enamel is more translucent, more of the color of the dentin shows through. If it is more opaque, the enamel absorbs and reflects light so that less color is visible and the enamel looks brighter.
The language of color composition and reflected light
Color means the whole spectrum in the rainbow. The spectrum is made up of the three primary colors — red, blue, and green. When all are combined, they create white light.
Hue refers to the brightest forms of the colors. The color we perceive depends on the dominant wavelength of light that is reflected by an object.
Value refers to a color’s lightness or darkness. A brighter color has a higher value.
Chroma is the amount of identifiable hue in a color. An achromatic color (without hue) appears gray.
Saturation is a measure of a color’s intensity.
This terminology of color is used not only by dentists and dental technicians, but also by a wide range of artists. It implies expertise and understanding of how colors work, how they vary and change and affect one another.
Contact us today to schedule an appointment or to discuss your questions about bonding to repair chipped teeth. You can also learn more by reading the Dear Doctor article, “Artistic Repair of Front Teeth with Composite Resin.”
Due to financial circumstances, people often have a lost tooth restored with a removable partial denture, an effective appliance that restores function and a degree of aesthetic appearance. Later, though, they may want to improve both function and appearance with a dental implant.
If this describes you, you’re making a great choice. Dental implants are the closest technology we have to a natural tooth. But there may be a roadblock to your implant, especially if a long time has passed since your tooth loss—there may not be enough bone at the site to place an implant.
The heart of an implant is a titanium metal post surgically imbedded in the jawbone. The titanium naturally attracts bone cells, which grow and adhere to it to form a solid hold that can support a porcelain crown or other restorations like bridges or dentures. But to achieve a natural appearance it’s important that the implant is placed in the right location. To achieve that requires adequate bone.
But there may not be adequate bone if the tooth has been missing for a while. The forces generated when we chew travel through the teeth to the jawbone, which stimulates bone growth. If that stimulus is absent because of a missing tooth, new bone cells may not replace older ones at a healthy rate and the total bone volume begins to diminish. A denture can’t compensate and, in fact, accelerates bone loss.
But there may be a solution: bone grafting. With this procedure we place a donor bone graft into the area of bone deficiency some time before implant surgery. The graft serves as a scaffold for new bone cells to grow upon. Hopefully, this will produce enough healthy bone to support an implant. If the bone deficiency is minor, we may place the implant and the bone graft at the same time.
If you have experienced bone loss, we must first determine the amount of bone at the missing tooth site and whether grafting is a viable option. Bone grafting postpones your implant, but the delay will be worth the wait if we’re successful. With increased bone volume you’ll be able to obtain a new tooth that’s superior to your current restoration.
Tooth decay is one of the most common diseases in the world, nearly as prevalent as the common cold. It’s also one of the two major dental diseases—the other being periodontal (gum) disease—most responsible for tooth and bone loss.
Tooth decay begins with high levels of acid, the byproduct of oral bacteria feeding on food remnants like sugar. Acid can erode tooth enamel, leading to a cavity that will require removal of decayed material around it and then a filling.
Sometimes, though, decay can spread deeper into the tooth reaching all the way to its core: the pulp with its bundle of nerves and blood vessels. From there it can travel through the root canals to the bone. The continuing damage could eventually lead to the loss of the infected tooth.
If decay reaches the tooth interior, the best course of action is usually a root canal treatment. In this procedure we access the pulp through the crown, the visible part of the tooth, to remove all of the diseased and dead tissue in the pulp chamber.
We then reshape it and the root canals to receive a filling. The filling is normally a substance called gutta percha that’s easily manipulated to conform to the shape of the root canals and pulp chamber. After filling we seal the access hole and later cap the tooth with a crown to protect it from re-infection.
Root canal treatments have literally saved millions of teeth. Unfortunately, they’ve gained an undeserved reputation for pain. But root canals don’t cause pain—they relieve the pain caused by tooth decay. More importantly, your tooth can gain a new lease on life.
But we’ll need to act promptly. If you experience any kind of tooth pain (even if it goes away) you should see us as soon as possible for an examination. Depending on the level of decay and the type of tooth involved, we may be able to perform the procedure in our office. Some cases, though, may have complications that require the skills, procedures and equipment of an endodontist, a specialist in root canal treatment.
So, don’t delay and allow tooth decay to go too far. Your tooth’s survival could hang in the balance.
If you would like more information on tooth decay treatment, please contact us or schedule an appointment for a consultation. You can also learn more about this topic by reading the Dear Doctor article “Root Canal Treatment: What You Need to Know.”