Longitudinal Study of Dental Restorations Placed on Previously Unrestored Surfaces

The purpose of this project is to use data from “primary” restorations to assess how defects that may lead to failure develop over time, and to follow restorations placed in a practice-based setting for up to three years. The specific aims are to:

1. quantify the annual and 3-year incidence of defects and replacement rates on restorations inserted as primary restorations;

2. test the hypothesis that directly-placed composite restorations have a significantly higher 3-year incidence of defects and significantly higher replacement rate after 3 years compared to amalgam restorations;

3. test the hypothesis that the 3-year replacement rate of restorations in permanent teeth of adolescents is significantly higher than that of restorations in adults. Criteria used to evaluate restorations over time will be the same as those employed in the DPBRN study of replacement restorations. Recall frequency will be according to the schedule used in the practice where the restoration was placed. Patients will have been informed about the follow-up study as part of the informed consent procedure. If a patient seeks treatment in a different practice, informed consent will include permission to contact that practice for information related to restoration(s) in this longitudinal study.