Clinical Performance of Posterior Composite Tooth Fillings in Adults

Inclusion Criteria: * be older than 18 years of age * have 2 back teeth with similar size tooth decay or failed fillings, that are in need of new moderate-size fillings * both study teeth must be vital (tested with cold) * both study fillings must be visible on the cheek-side of the tooth. Exclusion Criteria: * do not meet all inclusion criteria * are under active orthodontic treatment * have severe medical complications * have dry mouth * have chronic gum disease or poor oral hygiene * are unavailable for long term recall (minimum of 2 years required) * cannot tolerate the rubber dam * have an unstable tooth contacts * have severe bruxing or clenching, or are in need of jaw joint therapy * are pregnant or breastfeeding.