Table 8.

Restoration failure percentage of amalgam and composite restoration carried out in posterior teeth from 2003 to 2011 (data from 2011 belong to the first half of the year), at the Odontology Faculty of the Complutense University and of the V. Vera Dental Clinic and Surgery Center of Madrid. A restoration is considered a failure if it lasts less than 50% of the average duration time for the type of restoration.

Year	2003	2004	2005	2006	2007	2008	2009	2010	2011
Composite	23%	22%	22%	22%	21%	22%	18%	19%	19%
Amalgam	7%	4%	4%	5%	5%	5%	4%	7%	5%