This study confirms the likelihood that remnants of high-viscosity glass-ionomer sealant material are retained and block the deeper parts of pits and fissures even after the sealant appears to have disappeared clinical ly , exercising their carious lesion preventive effect
OBJECTIVES Resin composite sealants are retained longer than low-viscosity glass-ionomer sealants .
Nevertheless , a systematic review showed that there is no evidence that resin composite sealants are superior to low-viscosity glass-ionomers in preventing dentine carious lesion development .
This case study aim ed to investigate reasons for this .
Microtensile bond strength to ground enamel by glass-ionomers, resin-modified glass-ionomers, and resin composites used as pit and fissure sealants.
OBJECTIVES To measure the microtensile bond strength to ground enamel of different types of material s used as pit and fissure sealants in combination with different substrate conditioners . METHODS From 40 sound extracted molars , eight groups of five teeth were r and omly formed . The experimental groups were : ( 1 ) ( C ) 37 % phosphoric acid/ClinPro Sealant ( 3 M ESPE ) ; ( 2 ) ( G ) 37 % phosphoric acid/Guardian Seal ( Kerr ) ; ( 3 ) ( E/TF ) 37 % phosphoric acid/Excite/Tetric Flow ( Ivoclar-Vivadent ) ( 4 ) ( OS/UF ) 37 % phosphoric acid/One Step (Bisco)/UniFil Flow ( GC ) ; ( 5 ) ( OS/AE ) 37 % phosphoric acid/One Step/AEliteflo ( Bisco ) ; ( 6 ) ( UB/UF ) UniFil Bond/UniFil Flow ( GC ) ; ( 7 ) ( CC/FVII ) GC Cavity Conditioner/Fuji VII ( GC ) ; ( 8) ( CC/FII ) GC Cavity Conditioner/Fuji II LC Improved ( GC ) . On the buccal of each tooth , a 5 mm high build-up was created by incrementally adding layers of the sealing material on the conditioned enamel . By serially cutting the built-up tooth , multiple beam-shaped specimens about 1 mm x 1 mm in cross section were obtained , and loaded in tensile ( 0.5 mm/min ) until failure occurred . RESULTS The bond strengths measured in MPa were : ( C ) 20.41+/-11.79 ; ( G ) 16.02+/-7.99 ; ( E/TF ) 24.06+/-9.67 ; OS/UF 15.63+/-9.00 ; ( OS/AE ) 9.31+/-6.05 ; ( UB/UF ) 4.96+/-3.46 ; ( CC/FVII ) 1.70+/-2.19 ; ( CC/FII ) 2.19+/-1.44 . CONCLUSIONS The conventional and the resin-modified glass ionomers measured bond strengths significantly lower than those of any resin-based material s. Failure frequently occurred cohesively within the cement . Flowable composites in combination with phosphoric acid and a total-etch adhesive performed similarly to resin-based material s specifically conceived for sealings , such as ClinPro Sealant and Guardian Seal . The bond achieved by resin composite when treating enamel with the self-etching primer used in this study ( UniFil Bond ) was significantly lower than that developed when the substrate was etched with 37 % phosphoric acid
This study confirms the likelihood that remnants of high-viscosity glass-ionomer sealant material are retained and block the deeper parts of pits and fissures even after the sealant appears to have disappeared clinical ly , exercising their carious lesion preventive effect
OBJECTIVES Resin composite sealants are retained longer than low-viscosity glass-ionomer sealants .
Nevertheless , a systematic review showed that there is no evidence that resin composite sealants are superior to low-viscosity glass-ionomers in preventing dentine carious lesion development .
This case study aim ed to investigate reasons for this .