Dr. Brian Saby's Dental Blog

Once a dentist has finished a comprehensive dental examination, he must come up with a treatment plan to help meet the patient’s dental goals.  These usually are:  Comfort, function, stability and esthetics.  More plainly: Look good, feel good, chew well and last a long time. 

To reach these goals, we often divide dental treatment in to two phases.  Phase one treatment involves the treatment of active disease.  Phase two treatment involves repair of damage caused by the previous disease.  In some cases, phase one treatment will be all that is required, in other situations, phase one and phase two treatment can be accomplished at the same time.  Sometimes, phase one treatment must be completed prior to phase two treatment.

Phase one treatment…stopping disease.

Creating healthy gums.  This usually involves gum treatment.  The goal is to have healthy gums that do not bleed.  This usually means a trip to the dental hygienist for a deep cleaning.  If the gums are still inflamed after initial gum therapy, laser gum therapy, chemical gum therapy or surgical gum therapy may be needed.

Creating healthy teeth.  This involves fixing any cavities that have formed.  These can be new cavities, or cavities under and around old fillings.  Worn teeth must be examined and the cause of the wear determined.  If it looks like the wear is due to grinding the bite must be stabilized.  If the damage is caused by acids, the source of the acids that dissolve the teeth must be found and eliminated or reduced if possible. 

 Creating a healthy bite.  This part of dental treatment is not as familiar to the general public.  In order to function properly and to reduce wear, the bite must be checked to ensure that the lower teeth move into the upper teeth in a way that maximizes the biting forces and reduces the strain on the muscles and jaw joint.  Many times the phase one treatment for this problem may be an appliance that is worn at night to help relax the muscles and prevent wear.  Phase one bite therapy may involve balancing the bite by selective tooth adjustment.

 After the disease is halted phase one treatment is either completed, or the final part of the phase one treatment may be to move the teeth.  This is done to allow the bite to be as good as it can be.  Teeth are moved with braces. 

Following phase one dentistry, the teeth and gums should be in a state where they are not infected or inflamed and the teeth are where they need to be. At this point, all treatment is either completed and only regular check ups and maintenance is required or it is time to start restoring the teeth to their ideal form and function…phase two treatment. 

I will discuss more about phase two dentistry in our next segment.

If you were to take a survey of the “over 40” crowd.  You would find that the majority of people over 40 have had numerous fillings in their teeth, especially the back teeth.  You would also find that most of the old fillings are silver amalgam and likely quite large. (Feel free to try this at your next summer barbeque; it will make you the topic of conversation for months.)

The prevalence of dental restoration in that demographic group is largely due to the fact that this group missed some important dental developments during their formative years.  Fluoridation, dental sealants and the importance of flossing and brushing in the pre-teen years being the main advances in protection against tooth decay that were advanced shortly after this age group got their first cavities.

Fortunately, dentists have been very successful in the treatment of dental decay.  For many years now we have been proficient in placing fillings teeth that have been affected by decay.   Unfortunately, fillings have a limited life span and fail over time.  Each time a filling fails the next filling needs to be bigger.  At a certain point, there may be too much filling and not enough tooth to produce a good result.

Dental fillings were designed to fill a hole in the tooth using the remaining tooth to support the filling.  When the filling exceeds a certain size the remaining tooth structure is too brittle to hold the filling without fracturing under the strain of chewing.  This results in fracture of the remaining tooth.  To prevent tooth fracture or to repair a tooth that has fractured the dentist will recommend that the tooth have a crown.

A crown (also called a cap) is a restoration that covers the outside of the tooth.  The crown acts to hold the tooth together and replace the missing tooth material.  Think of it as a casing for the tooth.

To produce a crown, a thin veneer of tooth material is milled from the outside and the top of the tooth.  This produces enough space for the restorative material and allows for the crown to be shaped so it can function like a tooth.  Usually, 1 to 1.5 mm of tooth is removed around the tooth and 1 to 2mm removed from the biting surface.  A very accurate rubber-like impression is taken of the tooth and a plaster model is produced that is exactly like the prepared tooth.  A dental lab technician will then construct the crown that fits the model, and therefore the tooth precisely.  The crown is then cemented over the tooth preparation, any you are on your way to years of happy chewing.

Crowns can be made of a number of materials.  The most conservative, longest lasting material is still gold.  The malleable nature of gold allows for final finishing in the mouth that makes for best seal.  The main drawback of the gold crown is the colour. 

If esthetics is a concern, a veneer of porcelain can be made over the gold of a crown.  With modern, porcelain technology, these teeth can be made to be indistinguishable from natural teeth.  New technology even allows for all porcelain crowns that fit well, are strong and have the maximum esthetic potential.  This is especially helpful when the tooth to be crowned is near the front of the mouth.

Dr. Saby can help you decide if it is best for you to have crowns on some of your teeth and if so, what type you should have.