Apical root canal transportation and remaining dentin thickness associated with ProTaper Universal with and without PathFile.
BACKGROUND
This study aimed to compare, using digital subtraction radiography, apical transportation in mesiobuccal root canals of extracted human maxillary molars instrumented with ProTaper Universal F3 and F4 files (Dentsply Maillefer, Ballaigues, Switzerland) with and without the prior creation of glide paths using the PathFile system and to compare, using cone-beam computed tomographic imaging, remaining dentin thickness (RDT) after complete preparation.


METHODS
Forty mesiobuccal roots with curvatures of 20°-35° were used. In group A, glide paths were created with PathFile #1, #2, and #3 to the working length; in group B, no glide paths were used. All canals were instrumented up to F4 to the working length. Digital subtraction radiographic images were obtained in buccolingual and mesiodistal directions. Apical transportation associated with F3 or F4 was calculated based on the difference between the tip of the first and the last instrument analyzed in each group. RDT was calculated based on cone-beam computed tomographic images.


RESULTS
Apical transportation was higher after F4 regardless of the use of the PathFile system. No statistically significant differences between groups A and B were observed in apical transportation after instrumentation with F3 or F4 (P > .05). Group A showed greater RDT values at 2 (buccal and mesial walls, P < .05) and 3 mm (buccal and distal walls, P < .05) from the apex but not at 1 mm.


CONCLUSIONS
The use of the PathFile system before root canal preparation with ProTaper Universal F3 and F4 did not influence apical transportation but was associated with greater RDTs at 2 and 3 mm from the apex.
Department of Restorative Dentistry, School of Dentistry, Universidade Luterana do Brasil, Canoas, Rio Grande do Sul, Brazil.
Fabiane
F
Zanette
Department of Restorative Dentistry, School of Dentistry, Universidade Luterana do Brasil, Canoas, Rio Grande do Sul, Brazil. Electronic address: regrazziotin@gmail.com.
Renata
R
Grazziotin-Soares
Department of Dental and Maxillofacial Radiology, School of Dentistry, Universidade de Passo Fundo, Passo Fundo, Rio Grande do Sul, Brazil.
Mateus Ericson
ME
Flores
Department of Dental and Maxillofacial Radiology, School of Dentistry, Universidade Luterana do Brasil, Canoas, Rio Grande do Sul, Brazil.
Vania Regina
VR
Camargo Fontanella
Department of Cosmetic Dentistry, School of Dentistry, Universidade de São Paulo, São Paulo, São Paulo, Brazil.
Giulio
G
Gavini
Department of Restorative Dentistry, School of Dentistry, Universidade Luterana do Brasil, Canoas, Rio Grande do Sul, Brazil.
Fernando Branco
FB
Barletta
D054893:Cone-Beam Computed Tomography / Q000379:methods; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D003804:Dentin / Q000000981:diagnostic imaging*; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008963:Molar / Q000000981:diagnostic imaging; D019252:Radiography, Dental, Digital / Q000379:methods; D011897:Random Allocation; D012388:Root Canal Irrigants / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation*; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D013382:Subtraction Technique; D019227:Tooth Apex / Q000000981:diagnostic imaging*; D019415:Torque
D012388:Root Canal Irrigants; D012973:Sodium Hypochlorite
Cone-beam computed tomographic imaging; PathFile; digital radiography; endodontics; glide path; instrumentation; root canal preparation; root transportation