title: Tooth discoloration induced by a novel mineral trioxide aggregate-based root canal sealer.
abstract: OBJECTIVE
  The aim of this study was to evaluate tooth discoloration caused by contact with a novel injectable mineral trioxide aggregate (MTA)-based root canal sealer (Endoseal; Maruchi, Wonju, Korea) compared with a widely used resin-based root canal sealer (AHplus; Dentsply De Trey, Konstanz, Germany) and conventional MTA (ProRoot; Dentsply, Tulsa, OK, USA).
  
  
  METHODS
  Forty standardized bovine tooth samples were instrumented and divided into three experimental groups and one control group (n = 10/group). Each material was inserted into the cavity, and all specimens were sealed with a self-adhesive resin. Based on CIE Lab system, brightness change (ΔL) and total color change (ΔE) of each specimen between baseline and 1, 2, 4, and 8 weeks were obtained.
  
  
  RESULTS
  At all time points, Endoseal showed no significant difference in ΔL and ΔE compared to AHplus and control group (P > 0.05), whereas the ProRoot group showed significantly higher ΔL and ΔE values than the Endoseal group at 2, 4, and 8 weeks (P < 0.05). Therefore, Endoseal showed less discoloration than conventional MTA and a similar color change to AHplus.
  
  
  CONCLUSIONS
  Within the limitations of this study, our data indicate that the MTA-based sealer produces a similar amount of tooth discoloration as AHplus which is considered to be acceptable.
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Jeonju, Korea.
authors.forename: Dae-Sung
authors.initials: DS
authors.lastname: Lee
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Jeonju, Korea.
authors.forename: Myung-Jin
authors.initials: MJ
authors.lastname: Lim
authors.affiliation: Department of Conservative Dentistry, Wonkwang University Dental Hospital, Iksan, Korea.
authors.forename: Yoorina
authors.initials: Y
authors.lastname: Choi
authors.affiliation: Discipline of Oral Sciences, Faculty of Dentistry, National University of Singapore, Singapore.
authors.forename: Vinicius
authors.initials: V
authors.lastname: Rosa
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Dankook University, Cheonan, Korea.
authors.forename: Chan-Ui
authors.initials: CU
authors.lastname: Hong
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Jeonju, Korea.|Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Korea.
authors.forename: Kyung-San
authors.initials: KS
authors.lastname: Min
keywords: Mineral trioxide aggregate; root canal sealer; spectrophotometry; tooth discoloration