Data showed a higher number of Inadequacy A for restorations with the additional technique for marginal seal ( Group 2 ) : 16 of 24 total ( 57 % ) at 6 months ; 28 of 37 total ( 76 % ) at 12 months ; 36 of 44 total ( 82 % ) at 18 months ; 22 of 33 total ( 67 % ) at 24 months ; 14 of 21 total ( 70 % ) at 36 months and 16 of 25 total ( 64 % ) at 48 months .