[Experimental study using 86Rb on the permeability of biomaterials used for occlusal pit and fissure sealants]

In experimental in vivo work, we used 45Ca and 131I radioisotopes to establish the impervious nature of biomaterials used for filling. A comparative study of permeability in 3 biomaterials used as pit and fissure sealant, alkylcyanoacrylate, Delton and Sigilar was conducted with 86Rb radiosotope. The materials were applied to the surface of 60 natural intact teeth divided into 3 sets and 6 groups. Each of the 3 types of materials were applied no one set of teeth. Within each set, a group of 10 teeth were labeled with 86Rb for 30 minutes and the other group was marked with 86Rb for 60 minutes. After washing, gamma emission was measured immediately after labeling then again 24 hours later. Results indicate that the biomaterial Delton is the least permeable to 86Rb, gamma counts being approximately 20-times lower with Delton than with alkylcyanoacrylate and Sigilar.