Under the conditions of these in vitro leakage studies , it is concluded that smear layer removal improves the fluid-tight seal of the root canal system whereas other factors such as the obturation technique or the sealer , did not produce significant effects
The purpose of this systematic review was to determine whether smear layer removal reduces leakage of obturated human teeth in vitro .
Microleakage at gingival dentin margins of Class V composite restorations lined with light-cured glass ionomer cement.
This study compared the microleakage of  light-cured and auto-set glass ionomer liners used in Class V composite laminated glass ionomer restorations by determining the amount of microleakage at the gingival cementum/dentin margins . St and ardized nonundercut V-shaped Class V cavities with gingival margins below the cementoenamel junction were prepared on the mesial and distal surfaces of 40 molars , establishing a total of 80 cavities , which were r and omly divided into four groups . Each was lined with glass ionomers : group 1 , Ketac-Bond ( ESPE-Premier ) , which served as the control ; group 2 , XR-Ionomer ( Kerr ) ; group 3 , XR-Ionomer with polyacrylic acid ( PAA ) pretreatment ( Kerr ) ; and group 4 , Vitrabond ( 3 M ) . Specimens were thermocycled for 300 cycles in 0.5 % aqueous solution of basic fuchsin between 4 and 55 C with a 1-minute dwell time , and individually embedded in an epoxy resin . Statistical analysis indicated no differences among groups using the light-cured glass ionomer ( groups 2 to 4 ) , and they showed significantly less leakage than the control ( group 1 ) at P less than 0.00001 ) . Removal of the smear layer using 10 % polyacrylic acid solution did not influence microleakage in restorations with light-cured glass ionomer liners
Under the conditions of these in vitro leakage studies , it is concluded that smear layer removal improves the fluid-tight seal of the root canal system whereas other factors such as the obturation technique or the sealer , did not produce significant effects
The purpose of this systematic review was to determine whether smear layer removal reduces leakage of obturated human teeth in vitro .