Are there different types of dental fillings? if yes, what are they. is one kind better/longer-lasting than others?

Yes: 1) amalgam - silver type, least expensive, tends to leak bacteria to the inside and leads to internal fractures. 2) composite resin - tooth color, great if "proper" use of bonding solution. The bigger it is the weaker it is. 3) glass ionomer - limited use in more long term temporary situations. There are others based on the specific application and properties needed.

Yes : Gold is generally the longest lasting as it has properties most similar to your teeth. Because of the appearance and cost it is done less often. Most studies show amalgam restorations lasting the longest but in many instances a well done composite filling will match the longevity.

And they are:: 1- amalgam (silver): durable, not esthetic, transmits cold\hot the most; 2-composite: esthetic, durable, bonds to tooth, slightly more wear 3- gold: expensive, not esthetic, not used much anymore 4- composite\porcelain inlays & onlays: esthetic, durable, technique sensitive, more expensive but can restore more of tooth than amalgam or composite and holds up well; 5- crowns: full coverage.

Composite or amalgam: An amalgam is an alloy of mercury with various powdered metals. It is inexpensive & when properly placed has been known to last for many years- reliably. In my office, i only use composite resin. Which is a polymer plastic and silicates- light cured to achieve a hardness necessary for proper chewing. Not as hard as amalgam, but very esthetic because of the shade selection for color matching!

Yes : Gold is generally the longest lasting as it has properties most similar to your teeth. Because of the appearance and cost it is done less often. Most studies show amalgam restorations lasting the longest but in many instances a well done composite filling will match the longevity. Another filling material that is not used as often in the U.S. Is glass ionomer.