Should I be worried about getting a glass ionomer filling?

April 14, 2009 7:56 AM

Should I be worried about getting a glass ionomer filling?

I have previously had a whole bunch of composite resin fillings. My new dentist says I need another new filling, and that one of my existing fillings is cracked. I am down to receive 'glass ionomer fillings', though I wasn't asked for a preference as at my old place.

This website says "Traditional glass ionomer is significantly weaker than composite resin. It is much more susceptible to wear and prone to fracture." This doesn't sound that good to me. I've also seen this website which indicates medical problems arising from glass ionomer fillings, although not sure whether it should be taken seriously.

Does anyone have any experience with these types of fillings, either as a patient or a dentist (or an informed other)? Should I be concerned?

posted by Kirn to health & fitness (6 comments total)

Well, you should definitely be informed.

Call your dentist and ask why he's recommended 'glass ionomer fillings' (which you have never heard of, ahem) rather than the usual resin-thingies that you think you had before.

Don't argue with him, and for god's sake don't say "but I read on the Internet...." but just listen to the logic. Otherwise you (and everyone here) is just guessing.
posted by rokusan at 8:07 AM on April 14

This sounds like a good place to get a second opinion - you'd probably have to pay for a separate exam from another dentist, but if you're concerned about this dentist's judgment or motivations, it may be worth it to you.
posted by Salvor Hardin at 8:29 AM on April 14

Here is what the American Dental association has to say on the different options for fillings. This would be good for you to read before asking your dentist why he recommends ionomers.
posted by TedW at 10:32 AM on April 14

Dentist here.
GI fillings have been used for many years, primarily as fillings near the gumline in patients who have a high rate of decay, because they release fluoride ions and can help prevent future cavities along their own edges.
Typically they are not used where heavy wear is expected (e.g. the biting surface of molar teeth). That being said, there are hybrid materials and reinforced GI's that might be appropriate to a given circumstance.
It is not out of bounds to express your curiosity as to the material choice, and if you don't get a satisfactory answer seek a second opinion or find someone with whom you communicate better. I typically do not charge for second opinions, unless an x-ray is necessary.
You can PM me if you want to give more info.
posted by OHenryPacey at 11:46 AM on April 14

Another dentist here...but I just agree with what OHenryPacey said. I would ask the dentist why he decided on GI vs composites. I'm actually surprised you even noticed. Most of my patients just accept whatever material I decide on. Usually they only choose between composite vs amalgam (silver) fillings.

I sometimes use glass ionomers in patients who have rampant cavities due to high sugar consumption or are at high risk for cavities. It is also useful in fillings on root surfaces or near the gumline or when slightly subgingival, oftentimes on elderly patients. Glass Ionomers bond to dentin well and can also be placed where moisture or blood contamination is a concern. Composites must be placed absolutely dry with no water, saliva, or blood contamination. They typically don't have the same translucency or esthetics as resin composites.

I haven't heard any valid research about any negative health effects of glass ionomers. That website seems a little shady and alarmist. They are a useful tool in the dentists armamentarium.
posted by amalgamator at 9:26 PM on April 14 [1 favorite has favorites]

Thanks everybody.
posted by Kirn at 4:24 AM on May 2