Over the last decade Posterior Composite Restorations (white fillings on molars) have become very popular. These type of restorations have many advantages, and a few disadvantages. However, what happened to the good old “silver” amalgam fillings? Which type of filling is better? Well the answer, as most things in life are not that clear cut. The best restoration for your needs should be something you should discuss with your Dentist.
Lets start with the old standby, amalgam. Amalgam has been used to treat patients Worldwide for centuries. They are cheap, durable, and slightly malleable. Compared to their composite siblings, silver fillings have twice the functional lifetime. These type of restorations have recently come under fire due to the fact one of their components is mercury. Obviously mercury is a toxic substance (in great enough concentration), and may cause some allergic reactions. There are many organizations which indicate the use of amalgam restorations is a deplorable practice, and all individuals should have these fillings removed. These sources will have you believe they are the primary cause of every illness from Alzheimer’s, Multiple Sclerosis, Heart Disease, Autism and the all important Erectile Dysfunction. On the other hand, the American Dental Association has stated the removal and replacement of all amalgam fillings on asymptomatic patients, with no caries or restoration fractures is irresponsible and unethical. Of course many of my readers will note, I believe no scientific study which comes from a Government or Corporate funded source. That being said, the first 16 years of my adult life, I worked as a medic and dental assistant. This means I have inhaled, aspirated and touched with my bare hands, thousands of times the amount of mercury as most. I am very happy to report no Alzheimer’s, or ED thus far. Additionally, with literally Billions of human lab rats running around, if this form of dentistry was so dangerous, the World would certainly not be overpopulated. Amalgam remains a safe, and cost effective option especially for patients who are impoverished or are forced to utilize Government funded medical insurance to contain costs.
Composite, or white fillings on back teeth although about twice as costly, are in many ways a better option. They have been around for many, many years for utilization on front teeth, and the technology is constantly improving. The first advantage is obviously aesthetics. Today’s plastic fillings can look so natural without radiographs, even many dentists may have to look twice to identify them in your mouth. They come any many colors, to match any shade and light translucency of your natural enamel. Additionally, these fillings are bonded to your tooth (amalgams are mechanically retained with undercuts in your tooth, by the skilled hands of your doctor) creating a barrier around the margins of the filling to keep out harmful bacterial on a microscopic level. The bonding also makes these fillings far more resistant to lateral forces. This aspect can be very critical when they may be used in conjunction with a partial denture or next to an implant. One of the issues with these fillings on the back teeth can be the fact they are not as malleable as silver fillings, and because they are bonded to your tooth structure, they can fracture if you have an aggressive bite or when chewing hard substances. The advocates against amalgam restorations almost always advocate white fillings as being much safer than metal ones, due to the lack of mercury. These individuals seem to forget the primary elements of composites: plastic, glass ceramics, bonding agents and silica are not exactly natural and inert substances themselves. In the grand scheme of things, you might be jumping from the frying pan into the fire as far as toxicity goes. Of course, the same logic above applies here, there are billions of happy, healthy patients with an amazing low number of incidents reported of adverse or allergic reactions.
There are even more costly alternatives which can compensate for the shortcomings of fillings such as inlays or onlays. These are considered major restorations and are similar to small crowns. Your teeth are prepped (drilled), an impression taken, then the inlays are lab built and bonded into place several days later. Inlays can be made from almost any material which best fits your particular needs, such as gold and porcelain.
My personal life experience is I had amalgam restorations as a child. They functioned very nicely for over 20 years. While working with various Dentists I was fortunate enough to have the previous amalgams replaced with posterior composites. I loved how they looked and their smooth feeling on my teeth. Unfortunately I happen to have a very aggressive bite and they all fractured due to the excessive occlusal forces within a few years. They were replaced with pure gold inlays, which I fully expect to take to my grave with me.
Each person has a specific set of oral circumstances and an individual budget to meet those needs. Your dentist views your oral and over-all health as a top priority and will lead you down the best path for your individual needs. Just ask them about the options.
Thanks for reading, and I hope this information was beneficial.
Logan



