The arrangement of a caries usually means getting a filling, but sometimes they break, fall or do not stop the decay, therefore a recent study focused on the reasons why the fillings are more likely to fail.
Researchers of Research Network collected data from 226 dentists who placed 6,218 landfills in 3,855 patients, of whom about a third were amalgams, which contain amixture of metals. The other two thirds were of composite resin or hard plastic tooth color.
Over a period of two years, 386 of these fillings failed, which resulted in 6 percent of respondents. The reasons for failure were:
- Fill-cracking or breaking
- Stuffed who fell
- The edges of the filling eroded or decomposed
- The tooth requiring treatment of root canal or extraction
- Toothache or tenderness
The study also found that the material used in the filling not made a difference, since neither amalgam fillings nor resin fillings had a higher propensity to fail. Previous studies have shown failure rates for both types of filler ranged between 4 and 6 percent.
The study found other things that increase the risk of failure for a fill:
- The failure was twice as common in people over 65 years of age, compared with children.
- The failure rates were higher for fillings placed in the back teeth, placed on the front teeth.
- The failure was almost 5 times more common for fillings covering 4 tooth surfaces compared with stuffed covering only 1 surface. Given that larger landfills cover more surface and this increases the risk of cracks, breaks or other problems.