FAQ - Oral Pathology, Radiology and Medicine

Q. I have heard that there is such a thing as a cone beam CT x-ray machine designed for dentistry. What is this and should my dentist have one?

A. Cone beam CTs (CBCTs) are a family of units, each slightly different based on the manufacturer, like cars, but each basically similar. These units produce images that are 2D and 3D, and can be used for dental implant planning, to localize impacted teeth and look at some other disease processes involving the jaws and TMJs. The radiation dose for CBCTs is considerably lower than for standard CTs (1/10 to 1/100), but they do not show most soft tissue (non bone) very well. Also, these are expensive units, and to diagnose from them requires specialized training and knowledge. Your dentist can refer you to such a person, if there is a need.

Q. Do you think extra fluoride would help prevent cavities, or is there enough fluoride in toothpastes?

A. Fluoride has reduced the rate of cavities more than any other method of decay prevention. However, too much ingested fluoride can cause unesthetic spotting on teeth. Most community water supplies in our area are optimally fluoridated, so between using fluoridated toothpastes and using community water supplies, additional fluoride might not be needed for most people. However, for added cavity protection for teens and adults, daily rinsing with fluoride mouthrinses also can be beneficial. If you see a dentist who determines that you are at high risk for development of cavities, he/she might prescribe some prescription dispensed fluoride that is even more concentrated, so consult your dentist to determine how much fluoride is best for you.

Q. I have been bothered with canker sores for a number of years. What are canker sores and can anything be done to treat them?

A.Canker sores are also called aphthous ulcers. They appear within a day or two, usually heal in 7-14 days, and can be painful and annoying. We do not completely understand what causes canker sores, but they are not an infection and are completely different from fever blisters which occur on the outside of the lips and are caused by a virus. The discomfort caused by canker sores can be controlled by using topical steroid mouth rinses and ointments. Your local dentist should be able to prescribe these medicines for you.