title: Staining potential of calcium hydroxide and monochlorophenol following removal of AH26 root canal sealer.
abstract: OBJECTIVE
  The focus of this study was to examine the staining potential of calcium hydroxide (Ca(OH)2) on tooth structure following the removal of AH26 root canal sealer.
  
  
  METHODS
  Fifty maxillary anterior teeth were prepared and obturated with AH26 and gutta percha. The sealers were then removed 24 hours later and the teeth were randomly divided into two groups. Ca(OH)2 was then placed in the root canals of the first group of teeth as a medicament and camphorated monochlorophenol (CMCP) was placed in the second group of teeth after the filling material was removed. The color of the external tooth surfaces was determined before tooth preparation and two weeks after the placement of the medicaments. The Z test was used for statistical analysis.
  
  
  RESULTS
  All experimental teeth showed varying degrees of coronal discoloration with the Ca(OH)2 group showing more discoloration than the CMCP group (p<0.05).
  
  
  CONCLUSIONS
  Using Ca(OH)2 as a medicament after removing AH26 caused progressive discoloration of the teeth, whereas using CMCP caused only slight discoloration.
  
  
  CONCLUSIONS
  To avoid staining of the treated tooth, AH26 root canal sealer must be completely removed from the dentin walls before using a medicament.
authors.affiliation: Department of Conservative Dentistry and Endodontics of Faculty of Dentistry at University of Gazi in Ankara, Turkey.
authors.forename: Ali Cemal
authors.initials: AC
authors.lastname: Tinaz
authors.forename: Bagdagül Helvacioglu
authors.initials: BH
authors.lastname: Kivanç
authors.forename: Güliz
authors.initials: G
authors.lastname: Görgül
mesh_terms: D001729:Bismuth / Q000009:adverse effects*; D002126:Calcium Hydroxide / Q000009:adverse effects*; D002164:Camphor / Q000009:adverse effects*; D002733:Chlorophenols / Q000009:adverse effects*; D017005:Dental Debonding; D004338:Drug Combinations; D004853:Epoxy Resins / Q000009:adverse effects*; D006801:Humans; D012387:Root Canal Filling Materials / Q000009:adverse effects*; D012388:Root Canal Irrigants / Q000009:adverse effects*; D012834:Silver / Q000009:adverse effects*; D014025:Titanium / Q000009:adverse effects*; D014075:Tooth Discoloration / Q000139:chemically induced*
chemical_list: D002733:Chlorophenols; D004338:Drug Combinations; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D012834:Silver; C028044:epoxy resin AH-26; D002164:Camphor; C029804:camphorated parachlorophenol; D014025:Titanium; D002126:Calcium Hydroxide; D001729:Bismuth