This trial, based on a split mouth and double-blind design, will evaluate the effects of a
surface sealant on the clinical performance of composite resin class I restorations.
According to eligibility criteria, 10 pairs of upper and lower molars or premolars will be
restored with Esthet X composite resin. For each pair, one surface will be sealed with
Lasting Touch surface sealant. A clinical evaluation will be performed by two experienced
operators using modified USPHS (United States Public Health service) after 5 years after
treatment. Data will be analyzed using the McNemar test (p < 0.05).