الفهرس 
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Abstract
Aim: This study aimed to evaluate the effect ofEr:YAG laser using PIPS tip and Er,Cr: YSGG laser using RFT utilized with different inigants on smear layer removal and sealer adaptation. Materials and Methods: Once endodontic preparation of eighty-one single-rooted human teeth was performed using ProTaper Next® rotary files until X4, the samples were randomly divided into three groups (n=27 each) consistent with the sort of technique used for activation the irrigants. Each group subdivided into three subgroups; saline, NaOCI, & Salvadora persica (n=9 each) according to the type of irrigant used. After irrigating root canals with conventional, Er:YAG & r,Cr:YSGG-laser irrigation techniques, three samples of each subgroup were endodontically obturated. All samples were sectioned longitudinally for
measuring smear layer scores under environmental scanning electron microscope. Longitudinal sections of endodontically treated samples were microscopically evaluated to compare the differences in sealer adaptation after applying different irragation techniques. Results: Er:YAG & Er,Cr:YSGG-laser activated techniques showed less mean values of smear layer scores than conventional irrigation technique. Salvadora persica presented the best smear layer removal results. There were significant differences in sealer adaptation between conventional and laser-activated groups considering the type of the used irrigant Conclusions:Er:YAG & Er,Cr:YSGG-laser-activated techniques can achieve superior smear layer cleaning efficacy when saline or NaOCI & Salvadora persica or NaOCI is utilized as an irrigant, respectively. Salvadora persica solution was the most efficient root canal irrigant in eliminating smear layer. Erbium lasers may enhance the adaptation of root canal sealer depending on type of the applied irrigant.