Methods: Forty-two extracted human primary molars were used. Class II slot cavity was prepared either on intact mesial or distal surface. Specimens were randomly assigned into three groups equally. Cavities were restored with one of the assigned materials as follows; GC Fuji IX GP capsule, Ketac™ Molar Aplicap™, SDI-RIVA SC capsule. Following microleakage evaluation, performed using 0.5% methylene blue solution, specimens were equally divided in mesial-distal direction into two pieces. Penetration of the dye from outer surface, along the gingival floor toward the axial wall of the restoration was analyzed under stereomicroscope. Dye distance was measured in relation to the length of gingival floor, prior to statistical analysis.
Results: When compared among three encapsulated restorative materials, SDI-RIVA SC capsule showed significantly greater distance than GC Fuji IX GP capsule and Ketac™ Molar Aplicap™ (p<0.001, p=0.006), but there was no significant difference between GC Fuji IX GP capsule and Ketac™ Molar Aplicap™ groups (p=0.261).
Conclusions: This study demonstrated that among the three encapsulated GI restorative tested, GC Fuji IX had the least microleakage at gingival floor of Class II restorations in primary molars. These data suggested that coherence of the GI restorative materials remained different among products from various companies, despite of similar delivery method.