Posts for: September, 2015
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.”
A loose baby tooth is normal and expected; a loose permanent tooth is quite another matter: it’s an advanced sign of disease that could lead to losing the tooth.
The reasons for its looseness may vary. You may have experienced “primary occlusal trauma,” in which the teeth have experienced a prolonged excessive biting force beyond their tolerance. This can be caused by habitual grinding or clenching the teeth.
You may have also experienced “secondary occlusal trauma”: although the biting forces are within normal ranges, the teeth still can’t handle the stress due to degraded bone support and gum tissue detachment. Clenching habits combined with weakened bone and gums will only accelerate and worsen the damage.
The most frequent cause in adults for loose teeth is secondary trauma from periodontal (gum) disease. Bacterial plaque built up on teeth from poor oral hygiene causes a chronic infection that eventually weakens gum attachment to the teeth. A loose tooth is a late sign of this damage.
Treatment for disease-based loose teeth has a twofold approach. First, we thoroughly clean the tooth, root and gum surfaces of all plaque and calculus (hardened plaque deposits) to reduce the infection and inflammation and restore tissue health. This is often accompanied by antibiotic treatments to reduce bacteria below the gum tissue.
For the loose teeth themselves, we may need to modify the forces against them while the gums and bone heal. One way to lessen the biting force on a tooth is to reshape its and the opposing tooth’s biting surfaces. For extensive looseness we can also splint the affected tooth or teeth with other teeth. Temporarily, we can apply splinting material to the outside of both the loose and stable teeth or cut a small channel into them and apply bonding material to join them. A permanent option is to crown both the affected teeth and nearby stable teeth and fuse the crowns together.
These and other stabilizing techniques, like occlusal night guards to reduce the effects of teeth grinding or orthodontic treatment, will help secure the teeth. Coupled with disease treatment and renewed dental care and hygiene practices, you may be able to keep that loose tooth from being lost.
If you would like more information on treating loose teeth, 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 “Treatment for Loose Teeth.”
While pediatric dentistry has made great strides in making young patients’ dental visit experiences more relaxing, some children and teenagers still have difficulty with anxiety. Their anxiety in turn can make necessary care much harder to provide.
For difficult cases, many dental providers for children now incorporate a technique known as conscious sedation to help ease anxiety. With this technique, they’re able to perform procedures like cavity-filling or tooth-extraction that are more difficult with an anxiety-prone patient.
While general anesthesia creates a total loss of consciousness, conscious sedation uses precise medications to suppress consciousness at different levels ranging from light to deep suppression, and create a relaxed state for the patient. A child under sedation can still breathe normally and respond to certain stimuli, including touch and verbal commands. For only a light or minimal effect, a dentist normally administers the sedation drug as a pill the child takes orally. For deeper sedation, the medication is most likely delivered through a vein (intravenously).
Sedation reduces fear and anxiety but not necessarily pain, so it’s often accompanied by some type of anesthesia, either a local anesthetic delivered by injection to the procedure site or with a nitrous oxide/oxygen gas combination that’s inhaled through a mask worn by the patient.
Even though the child isn’t completely unconscious, one of the dentist’s staff will monitor vital signs (heart and respiration rates, blood pressure and blood oxygen level) throughout the procedure. This continues even after the treatment is over until the child’s vital signs return to pre-sedation levels. Once released, they will need a ride home and should rest for the remainder of the day. They can then return to school and resume other normal activities the next day.
With the advent of newer and safer drugs, conscious sedation is becoming a more widespread technique in both medicine and dentistry. Using it to ease a child’s anxiety increases the chances they’ll receive all the dental care they need without unpleasant memories of their visit that could follow them into later life.
If you would like more information on the role of conscious sedation for children, 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 “Sedation Dentistry for Kids.”