title: The effectiveness of different thickness of mineral trioxide aggregate on coronal leakage in endodontically treated deciduous teeth.
abstract: OBJECTIVE
  The purpose of this study was to evaluate coronal dye leakage of mineral trioxide aggregate (MTA) when placed in different thicknesses over endodontically treated deciduous teeth.
  
  
  METHODS
  Fourty-four extracted primary molar teeth were prepared for root canal treatment, and the canals were obturated with a paste including iodoform and calcium hydroxide. The teeth were randomly divided into 4 experimental groups, one for each material used for the coronal seal. Primary molar teeth were sealed with different thicknesses (1, 2, 3, 4 mm) of mineral trioxide aggregate (N=11) for each group. After a clearing procedure, data were statistically analyzed using the Kruskal-Wallis test, with differences of P<.05 considered to be significant.
  
  
  RESULTS
  All positive control teeth showed dye penetration and all negative control groups showed no leakage. Statistically significant differences between the means of each group are identified. Group 1 (1 mm MTA) had a significantly greater percentage of dye penetration than the other groups (P<.05). Group 4 (4 mm MTA) had the lowest mean leakage (4%); it did not differ significantly from group 3 (3 mm MTA; P>.05).
  
  
  CONCLUSIONS
  The 4-mm thick mineral trioxide aggregate had the lowest dye penetration, and there was no significant difference between this group and the 3 mm group. The 1-mm thick MTA showed the greatest percentage of dye penetration among the groups. The depth increase of MTA placed as a barrier following root canal treatment of deciduous teeth reduced the coronal leakage.
authors.affiliation: Faculty of Dentistry, Department of Paediatric Dentistry, Gazi University, Ankara, Turkey. aysegul@gazi.edu.tr
authors.forename: Aysegül
authors.initials: A
authors.lastname: Olmez
authors.forename: Dilek
authors.initials: D
authors.lastname: Tuna
authors.forename: Yesim Turan
authors.initials: YT
authors.lastname: Ozdoğan
authors.forename: A Evren
authors.initials: AE
authors.lastname: Ulker
mesh_terms: D017607:Aluminum Compounds; D017610:Calcium Compounds; D003763:Dental Leakage / Q000517:prevention & control*; D004338:Drug Combinations; D006801:Humans; D008963:Molar; D010087:Oxides; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D017640:Silicates; D014094:Tooth, Deciduous
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate