Abstract
The purpose of this study was to investigate the physical properties of the two experimental resin sealants (5H.,5S., ) containing synthesized monomers.
The physical properties of these sealants were measured in order to compare them with those of commercial sealants (P., F., T. ). The results were as follows.
1. Adhesive property.
1) Adhesive strength with respect to the unetched enamel surface. The adhesive strength values of all sealants after standing at room temprature for 3 hrs. were 22.5-47.4 kg/cm2 and the highest adhesive strength value was obtained with T.. When soaked in water for 7 days, the adhesive strength values were 13.0-29.0kg/cm2 and the highest adhesive strength value was obtained with 5 S. (Table 1, Fig.4).
2) Adhesive strength with respect to the etched enamel surface. The adhesive strength values of all resin sealants were 151.0-166.3 kg/cm2 after standing at room temprature for 3 hrs. and the highest adhesive strength value was obtained with P.. On the other hand after soaking in water for 180 days, they were 118.7-137.2 kg/cm2 and the highest adhesive strength value was obtained with T.. After thermal stress, the adhesive strengths values were 112.4-133.8 kg/cm2and the highest adhesive strength was obtained with 5S. (Table 2, Fig.5).
2. The amounts of water absorption of all resin sealants. The amounts of water absorption of the resin sealant containing filler were lower than those of other resin sealants. (Fig.6)
3. Weight loss of all resin sealants by abrasion. The weight loss of the resin sealants containing filler were lower than those of other sealants. (Fig.7)
4. The component and content of filler. The principle components of the filler of P. and F. were SiO2 and TiO2, respectively and the contents of the filler were 51 wt % and 1.3 wt% in the base monomer respectively.
5. SEM observation
1) The size and form of filler.
The filler size of P. and F. were 1-5 μm and 1-10 μm respectively and their shapes were irregular. (Fig.8)
2) The resin surface after abrasion.
It was shown that the filler of P. was observed regulary on the resin surface, however, in case of F., the large filler particle congregated on a part of the resin surface. (Fig.9)
