title: Effect of dentin powder on setting time of mineral trioxide aggregate: an in vitro study.
abstract: OBJECTIVE
  Mineral trioxide aggregate (MTA) is a biomaterial with numerous clinical applications in the field of endodontics. The properties of this material come closest to the requirements of an ideal endodontic repair material. Delayed setting time though may limit the use of MTA in endodontic procedures. Many chemical based additives have influenced the setting time of MTA. The aim of this paper was to evaluate the effect of a natural additive in the form of human dentin powder on setting properties of ProRoot MTA (Dentsply/Tulsa Dental, Tulsa, OK).
  
  
  METHODS
  Thirty extracted human teeth were taken to obtain fine dentin powder. The methodology used to obtain dentin powder for the present study was same as performed by Haapsalo et al. The specimens were divided into two groups. The samples were placed in standardized stainless steel ring moulds. The setting time of MTA alone and in equal proportions with dentin powder as an additive was evaluated using Vicats apparatus.
  
  
  RESULTS
  MTA mixed with dentin powder showed faster setting time (70 minutes) in comparison to MTA without dentin powder (120 minutes) (P<0.5).
  
  
  CONCLUSIONS
  Although MTA is an ideal retrograde material with increased efficacy due to reduced setting on addition of dentin powder. A combination of MTA with dentin powder might be a viable option in procedures where fast setting of the MTA is critical.
authors.affiliation: Department of Conservative Dentistry and Endodontics Institute of Dental Sciences, Bareilly, India - anuraggurtu@yahoo.com.
authors.forename: S M
authors.initials: SM
authors.lastname: Sharma
authors.forename: A
authors.initials: A
authors.lastname: Gurtu
authors.forename: A
authors.initials: A
authors.lastname: Singhal
authors.forename: C
authors.initials: C
authors.lastname: Guha
authors.forename: K
authors.initials: K
authors.lastname: Dixit
authors.forename: A
authors.initials: A
authors.lastname: Aggarwal
authors.forename: R
authors.initials: R
authors.lastname: Bansal
authors.forename: K
authors.initials: K
authors.lastname: Agnihotri
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D003804:Dentin; D004338:Drug Combinations; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry; D011208:Powders; D012387:Root Canal Filling Materials / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D013997:Time Factors; D014020:Tissue Extracts / Q000302:isolation & purification / Q000494:pharmacology*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D011208:Powders; D012387:Root Canal Filling Materials; D017640:Silicates; D014020:Tissue Extracts; C086631:mineral trioxide aggregate