title: Effect of photo-activated disinfection on bond strength of three different root canal sealers.
abstract: BACKGROUND
  The aim of this in vitro study was to evaluate the bond strength of Photo-Activated Disinfection (PAD) system to dentin with different root canal sealers by using a push-out test design.
  
  
  METHODS
  A total of 30 extracted mandibular premolar teeth with single and straight roots were used. The crowns were removed and the root canals were prepared by using ProTaper rotary files. The smear layer was removed and the roots were randomly divided into two groups (n = 15) according to the use of PAD system as the final disinfecting agent. Each group was then divided into 6 (n = 5) subgroups and obturated with gutta-percha and 3 different root canal sealers. The groups were Group 1: Sodium hypochlorite (NaOCl) + ethylenediaminetetraacetic acid (EDTA)-AH Plus sealer; Group 2: NaOCl + EDTA + PAD-AH Plus; Group 3: NaOCl + EDTA-Sealapex; Group 4: NaOCl + EDTA + PAD-Sealapex; Group 5: NaOCl + EDTA-mineral trioxide aggregate (MTA)-Fiallapex; and Group 6: NaOCl + EDTA + PAD-MTA-Fillapex. 1-mm thickness horizontal sections (n: 5 × 4 = 20) were sliced for the push-out bond strength measurement.
  
  
  RESULTS
  Group 3 and 4 showed significantly lower bond strengths compared with all the other groups (P < 0.05). No statistically significant difference was found among Groups 1, 2 and 5, but there was statistically significant difference between Group 5 and 6 (P < 0.05).
  
  
  CONCLUSIONS
  This in vitro study indicated that the PAD system adversely affected the bond strength of the MTA Fillapex root canal sealer.
authors: Department of Endodontics, Faculty of Dentistry, Sifa University, Izmir, Turkiye.
authors: Evren
authors: E
authors: Ok
authors: Department of Endodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkiye.
authors: Huseyin
authors: H
authors: Ertas
authors: Department of Endodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkiye.
authors: Gokhan
authors: G
authors: Saygili
authors: Department of Endodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkiye.
authors: Tuba
authors: T
authors: Gok
keywords: AH Plus; Sealapex; bond strength; mineral trioxide aggregate Fillapex; photo-activated disinfection