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.”
While not as prevalent as adults, teenagers can have missing teeth, usually from injury or from never having been formed. Fortunately, life-like dental implants can replace missing teeth. But unfortunately for teens, implants aren't usually a good option—yet.
That's because a teenager's jaws are still growing, and will continue until early adulthood. Dental implants don't adjust to this growth like natural teeth and will eventually look out of place. It's best, then, to consider a temporary restoration for a teenager. And, there are two excellent options: one removable and one fixed.
The first is a removable partial denture (RPD). Like a full denture, an RPD has an acrylic base that resembles gum tissue, to which prosthetic (false) teeth are attached to match the positions of the missing teeth. It's usually held in place with metal or nylon clips that slide under part of the natural teeth at the gum line.
RPDs are versatile and durable. But they're not designed to be worn indefinitely, so they can be damaged if subjected to excessive biting forces like biting into something hard. And, peer-pressured teens may also feel self-consciousness about wearing a “denture.”
The other option is a bonded bridge. It's similar to a traditional bridge, except how it's supported in the mouth. A traditional bridge gains its support from the crowns on each end attached to natural teeth, which must be permanently altered for them. By contrast, a bonded bridge has strips of dental material extending from both sides of its back that are bonded to the back of the adjacent natural teeth.
With the bonding material behind the bridge, it can't be seen—and the natural teeth won't require permanent alteration. But a bonded bridge is usually more costly than an RPD and less secure than a traditional bridge. And not every teen is a viable candidate for one: issues like how the teeth fit together and if the teen has a tooth grinding habit could be strikes against this fixed option.
Your dentist can help you sort out the best of these options for your teen. If cared for and maintained properly, either restoration can buy you time until your teen is ready for dental implants.
If you would like more information on restoring a teenager's smile, 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 “Temporary Tooth Replacement for Teens: What Are the Options?”
A lot of people don’t like dental work because they believe it will be painful or uncomfortable. There’s an anatomical reason to back up that concern — the mouth with its dense network of nerves in the teeth and gums is one of the most sensitive parts of the human body.
But modern dentistry has helped solve much of the problem of pain with advances in local anesthesia. Using substances that temporarily block electrical impulses within the nerves of a selected area of oral tissues, there’s a good chance you’ll feel little to no discomfort even during moderately invasive procedures.
Unfortunately, you might have heard some complaints from others about local anesthesia that might make you wary of it. Many of these complaints, however, aren’t fully based on all the facts. So, let’s set the record straight about local anesthesia and what you can expect.
No need to be afraid of needles. Nobody enjoys the painful prick from an injection needle, and some people are highly fearful of them. But although it’s necessary to use a needle to deliver anesthesia to deeper levels of tissue, it’s possible you won’t feel it. That’s because we’ll typically apply a topical numbing agent to the skin surface that deadens the top layers where we insert the needle.
That numb feeling afterward won’t last long. One of the chief complaints in the past about local anesthesia was the irritating numbness that could long linger after a procedure. Today, however, with more advanced anesthetics and formulae, we’re better able to gauge the duration of the medication’s effect. This has greatly reduced the length of time afterward your mouth might have that awkward numbing sensation.
Anesthesia isn’t necessary for every procedure. Unless you have hypersensitive teeth, a lot of dental procedures don’t require anesthesia. Your enamel, for example, has no nerves and actually serves as a kind of “muffler” for sensations to lessen their effect. Cleaning your teeth or removing portions of the enamel can normally be performed without the need for numbing medication.
For procedures, though, where pain could be a factor, local anesthesia can make all the difference in the world. In these cases, anesthesia is your friend — it can help you receive the dental care you need without the discomfort.
If you would like more information on pain-free dentistry, 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 “Local Anesthesia for Pain-Free Dentistry.”
The Golden Globes ceremony is a night when Hollywood stars shine their brightest. At the recent red-carpet event, leading man Viggo Mortensen had plenty to smile about: Green Book, the movie in which he co-starred, picked up the award for Best Motion Picture—Musical or Comedy. But fans looking at the veteran actor's big smile today might not realize that it once looked very different. A few years ago, an accident during the filming of The Two Towers took a major chip out of Mortensen's front tooth!
That might be OK for some movies (think The Hangover or Dumb and Dumber)—but it's not so great for everyday life. Fortunately, Mortensen visited a dentist promptly, and now his smile is picture-perfect. How was that accomplished? He didn't say…but generally, the best treatment for a chipped tooth depends on how much of the tooth's structure is missing.
If the tooth has only a small chip or crack, it's often possible to restore it via cosmetic bonding. This procedure can be done right in the dental office, frequently in a single visit. Here's how it works: First the tooth is cleaned and prepared, and then a tooth-colored resin is applied to the area being restored. After it is cured (hardened) with a special light, additional layers may be applied to build up the missing structure. When properly cared for, a tooth restored this way can look good for several years.
For a longer-lasting restoration, veneers may be recommended. These are wafer-thin shells made of durable material (most often porcelain) that cover the front (visible) surfaces of teeth. Strong and lifelike, veneers can match the exact color of your natural teeth—or give you the bright, high-wattage smile you've always wanted. No wonder they're so popular in Hollywood! Because veneers are custom-made for you, getting them may require several office visits.
If a chip or crack extends to the inner pulp of the tooth, a root canal procedure will be needed to keep the tooth from becoming infected—a situation that could have serious consequences. But you shouldn't fear a root canal! The procedure generally causes no more discomfort than filling a cavity (though it takes a little longer), and it can help save teeth that would otherwise be lost. After a root canal, a crown (cap) is generally needed to restore the visible part of the tooth.
When a damaged tooth can't be restored, it needs to be extracted (removed) and replaced. Today's best option for tooth replacement is a dental implant—a small, screw-shaped post inserted into the bone of your jaw that anchors a lifelike, fully functional crown. Implants require very little special care and can look great for many years, making them a top choice for tooth replacement
If you have questions about chipped or damaged teeth, please contact our office or schedule a consultation. You can read more in the Dear Doctor magazine articles “Artistic Repair Of Front Teeth With Composite Resin” and “Porcelain Veneers.”
The CAT scan is a relatively recent technique in dentistry, used to get an image of what’s happening deep within your jaws. You may be wondering what a CAT scan tells us that a conventional x-ray picture does not, and whether it is worth the extra expense to get one. And how does a CAT scan compare with a conventional x-ray in terms of radiation exposure?
CAT stands for “computer assisted tomography.” Often it’s just called a CT scan, for “computerized tomography.” The word “tomography” comes from roots meaning “slice” and “write.” Tomographic techniques take repeated two dimensional pictures, similar to repeatedly slicing through an object, and then assembles them with a computer to produce a three dimensional (3-D) image.
The latest type of CT scan used in dentistry is called CBCT, or Cone Beam Computed Tomography. The Cone Beam refers to a spiral beam of x-rays, which is used to create a series of two dimensional images from which a computer creates a 3-D image. Such an image is of great value in assessing problems and planning treatment.
Here are just a few examples of how a CBCT scan can be used. Orthodontists can see skeletal structures and developing teeth that are still inside the jawbone while planning strategies for directing the teeth in order to arrive at a better bite. Oral surgeons can find impacted or missing teeth, see their locations, and view their proximity to nerves and sinuses, assisting them in planning surgeries. These scans are particularly useful for root canal specialists because they show root canals that are less than a millimeter wide and even reveal accessory canals that may not be visible on conventional x-rays. In cases of sleep disorders such as sleep apnea, a CBCT during sleep can be used to view a person’s airway and how it may be blocked by the tongue and other soft tissues in a person’s throat during sleep.
Compared to background radiation, the amount of radiation delivered in dental x-rays is minimal. A CBCT delivers a dose of radiation that is less than a typical full mouth x-ray series but more than a typical two dimensional panoramic radiograph. Generally CBCT scanners deliver lower doses than medical CT scanners.
With one low-dose CBCT scan, we can get an accurate idea of the internal structure of your bones and teeth and how they are situated in relation to each other. Prior to the availability of such images, many of these relationships had to be discovered in the course of a surgery or other treatment. Thus such a scan can aid greatly in the quality of treatment you will receive.
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