title: CT evaluation of apical canal transportation associated with stainless steel hand files, oscillatory technique and pro taper rotary system.
abstract: This study used computed tomography (CT) to compare apical canal transportation in mesiobuccal canals of maxillary molars prepared with different techniques. Sixty teeth were assigned to 3 groups (n=20), according to the technique used for root canal instrumentation: hand instrumentation with K-Flexofiles, K-Flexofiles activated by an oscillatory system and ProTaper NiTi rotary system. Pre and post-instrumentation CT images were obtained 3 mm short of the apical foramen and were superimposed to compare canal transportation. Data were analyzed statistically by ANOVA and Tukey's test using the SPSS software (α=0.05). In the buccal direction, the manual technique produced significantly less canal transportation than the oscillatory technique (p<0.05) and both were similar to the rotary technique (p>0.05). In the distal and distopalatal directions, the oscillatory technique produced more canal transportation (p<0.05). In the mesiopalatal direction, the oscillatory technique produced more canal transportation than the manual technique (p<0.05), and both were similar to the rotary technique (p>0.05). In conclusion, all techniques produced canal transportation, and the oscillatory technique produced the greatest removal of root dentin toward the innerside of the root curvature.
authors.affiliation: Department of Endodontics, Uningá Dental School, Passo Fundo, RS, Brazil. mateushartmann@terra.com.br
authors.forename: Mateus Silveira Martins
authors.initials: MS
authors.lastname: Hartmann
authors.forename: Vânia Regina Camargo
authors.initials: VR
authors.lastname: Fontanella
authors.forename: José Roberto
authors.initials: JR
authors.lastname: Vanni
authors.forename: Volmir João
authors.initials: VJ
authors.lastname: Fornari
authors.forename: Fernando Branco
authors.initials: FB
authors.lastname: Barletta
mesh_terms: D019412:Anatomy, Cross-Sectional; D003722:Dental Alloys / Q000737:chemistry; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D003804:Dentin / Q000000981:diagnostic imaging; D004492:Edetic Acid / Q000627:therapeutic use; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008963:Molar / Q000000981:diagnostic imaging; D061330:Multidetector Computed Tomography / Q000379:methods*; D009532:Nickel / Q000737:chemistry; D009991:Oscillometry; D012388:Root Canal Irrigants / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D013193:Stainless Steel / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D019227:Tooth Apex / Q000000981:diagnostic imaging; D014092:Tooth Root / Q000000981:diagnostic imaging
chemical_list: D003722:Dental Alloys; D012388:Root Canal Irrigants; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D004492:Edetic Acid; D014025:Titanium; D012973:Sodium Hypochlorite