Conclusions : The application of a 2 % chlorhexidine solution after acid etching increased the microtensile bond strength significantly for follow-up times of 6 months or more .
The adhesive type had no influence
Background and Objectives : The aim of this systematic review was to examine the effect of 2 % chlorhexidine following acid etching on the microtensile bond strength of resin restorations for different follow-up times .
Dimensional changes of demineralized human dentine during preparation for scanning electron microscopy.
Dentine rods measuring approx . 0.7 x 0.7 x 5.0 mm were prepared from the crowns of extracted human third molars . The specimens were demineralized in 0.5 M EDTA ( pH 7.0 ) for 3 days and their volume measured with a digital micrometer under a dissecting microscope . The specimens were r and omly assigned to experimental groups and were chemically dehydrated in acetone . Next they were dried using either hexamethyldisilazane , Peldri II , or critical-point drying techniques . The dimensions of the specimens were measured again after each step and the changes in volume were expressed as a percentage of the original demineralized volume . The effects of fixing the specimens in 10 % buffered formalin before dehydration with acetone were also investigated for every drying procedure . Dehydration in acetone caused a small but significant reduction in the volume of demineralized formalin-fixed specimens but unfixed specimens did not change significantly . In general , all three drying procedures caused some shrinkage in demineralized dentine specimens . Unfixed specimens exhibited a volumetric shrinkage of approx . 15 - 20 % after drying with any of the methods . Fixed specimens shrank more than unfixed specimens after drying ( 25 - 35 % ) . Regardless of the drying technique , the specimens shrank a further 10 - 20 % when measured in the vacuum chamber of the scanning electron microscope . Among the three drying techniques employed , hexamethyldisilazane seems to be a very useful alternative to critical-point drying for the preparation of dentine specimens for scanning electron microscopy
Conclusions : The application of a 2 % chlorhexidine solution after acid etching increased the microtensile bond strength significantly for follow-up times of 6 months or more .
The adhesive type had no influence
Background and Objectives : The aim of this systematic review was to examine the effect of 2 % chlorhexidine following acid etching on the microtensile bond strength of resin restorations for different follow-up times .