Ripa [1993] reviewed numerous studies that have
been carried out comparing the retention rates between
third and first and/or second generation FS. The results
indicated that the performance levels for chemical
initiated FS and visible light photoinitiated FS were
similar within an observation period of up to 5 years.
However, in three comparison studies of longerduration, greater longevity was reported for the
chemically cured pit and FS [Rock and Evans, 1983;
Rock et al., 1990; Shapira et al., 1990].