title: Residues of calcium hydroxide-based intracanal medication associated with different vehicles: a scanning electron microscopy evaluation.
abstract: This study evaluated the presence of residues after removal of calcium hydroxide [Ca(OH)(2) ] associated with different vehicles. Thirty single-rooted teeth were instrumented to a master apical file #25 using 2.5% NaOCl as main irrigant and 17% trisodium EDTA (ethylenediaminetetraacetic acid) as final agent irrigant. Then, the root canals were dressed with Ca(OH)(2) associated with silicone oil (Group 1), 2% chlorhexidine gluconate (Group 2), or propylene glycol (Group 3). After coronal sealing, all teeth were kept in a moist environment at room temperature. After 7 days, the teeth were reopened and medicaments were removed using 5 mL of saline solution and instrumentation with master apical file followed by new irrigation with 5 mL of 2.5% NaOCl. Subsequently, teeth were split longitudinally and assessed by scanning electron microscopy. The wall cleanliness of the cervical and apical thirds of the roots were evaluated and scored by three blinded examiners. Statistical analysis was performed using Kruskal-Wallis and Wilcoxon tests at 5% level of significance. All roots had residues of Ca(OH)(2) on the canal walls. All experimental groups had similar results (P > 0.05) regardless of the third evaluated. There was significant difference between the apical and cervical thirds only in Group 3 (P < 0.05). Association of different vehicles to Ca(OH)(2) does not influence the persistence of residues on the root canal walls.
authors.affiliation: Department of Restorative Dentistry, Araraquara Dental School, UNESP-Univ Estadual Paulista, Rua Humaitá, 1680 Centro, 14801-903 Araraquara, SP, Brazil. norbertofariajr@ gmail.com
authors.forename: Norberto Batista
authors.initials: NB
authors.lastname: De Faria-Júnior
authors.forename: Kátia Cristina
authors.initials: KC
authors.lastname: Keine
authors.forename: Marcus Vinicius Reis
authors.initials: MV
authors.lastname: Só
authors.forename: Paulo Henrique
authors.initials: PH
authors.lastname: Weckwerth
authors.forename: Juliane Maria
authors.initials: JM
authors.lastname: Guerreiro-Tanomaru
authors.forename: Milton Carlos
authors.initials: MC
authors.lastname: Kuga
mesh_terms: D002126:Calcium Hydroxide / Q000627:therapeutic use*; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D006801:Humans; D007180:Incisor; D008855:Microscopy, Electron, Scanning; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D007507:Therapeutic Irrigation / Q000379:methods*; D019553:Tooth, Nonvital
chemical_list: D012388:Root Canal Irrigants; D002126:Calcium Hydroxide