title: Comparative SEM evaluation of three solvents used in endodontic retreatment: an ex vivo study.
abstract: This study compared, by scanning electron microscopy (SEM), the efficacy of three solvents on the removal of filling materials from dentinal tubules during endodontic retreatment. Forty human maxillary canines with straight canals were prepared according to a crown-down technique and enlarged to a#30 apical file size, before obturation with gutta-percha and a zinc-oxide-eugenol based sealer. The samples were stored for 3 months before being randomly assigned to four groups: chloroform (n=10), orange oil (n=10), eucalyptol (n=10) and control (n=10). Solvents were applied to a reservoir created on the coronal root third using Gates Glidden drills. The total time for retreatment using the solvents was 5 minutes per tooth. Following retreatment the roots were split longitudinally for SEM evaluation. SEM images were digitized, analyzed using Image ProPlus 4.5 software, and the number of dentinal tubules free of filling material from the middle and apical thirds was recorded. No significant difference was found among the solvent groups regarding the number of dentinal tubules free of root filling remnants in the middle and apical root thirds (p>0.05). However, the control group had fewer dentinal tubules free of filling material (p<0.05). Under the tested conditions, it may be concluded that there was no significant difference among the solvents used to obtain dentinal tubules free of filling material remnants.
authors.affiliation: Department of Endodontics, Fluminense Federal University, Niterói, RJ, Brazil. scelza@terra.com.br
authors.forename: Miriam F Zaccaro
authors.initials: MF
authors.lastname: Scelza
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Coil
authors.forename: Ana Carolina de Carvalho
authors.initials: AC
authors.lastname: Maciel
authors.forename: Lílian Rachel L
authors.initials: LR
authors.lastname: Oliveira
authors.forename: Pantaleo
authors.initials: P
authors.lastname: Scelza
mesh_terms: D002725:Chloroform / Q000627:therapeutic use; D003481:Cuspid / Q000648:ultrastructure; D003511:Cyclohexanols / Q000627:therapeutic use; D003786:Dental Pulp Cavity / Q000187:drug effects* / Q000648:ultrastructure; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D000077591:Eucalyptol; D005052:Eucalyptus; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D039821:Monoterpenes / Q000627:therapeutic use; D010938:Plant Oils / Q000627:therapeutic use; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D012389:Root Canal Obturation; D018915:Root Canal Preparation / Q000379:methods*; D012997:Solvents / Q000627:therapeutic use*; D013997:Time Factors; D019227:Tooth Apex / Q000187:drug effects / Q000648:ultrastructure; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use
chemical_list: D003511:Cyclohexanols; D039821:Monoterpenes; D010938:Plant Oils; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D012997:Solvents; D015035:Zinc Oxide-Eugenol Cement; D002725:Chloroform; D006171:Gutta-Percha; C087245:orange oil; D000077591:Eucalyptol