Accuracy of the Dentaport ZX apex locator for working length determination when retreating molar root canals.
The aim of this study was to evaluate the accuracy of the Dentaport ZX apex locator for working length determination during root canal retreatment of mandibular molars. Fifteen extracted mandibular first molars with separate mesial canals and apical foraminae and one distal canal were selected. The mesiobuccal and distal canals were investigated; the length with the file tip at the major diameter was defined as the tooth length (TL). The canals were prepared with ProTaper files to 1 mm short of this and filled with gutta-percha and AH Plus sealer. One week later, the root fillings were removed using ProTaper retreatment files. Tooth length was remeasured and recorded as the retreatment tooth length (RTL). Then electronic measurements were taken at the major (electronic apex locator (EAL) major) and minor (EAL minor) foraminae as suggested by the instrument display. These lengths were compared with RTL and measurements 0.5 and 1 mm short of this distance. For both canals, no significant difference was found between RTL and EAL major, and 0.5 mm short of RTL and EAL minor (P > 0.05). There were significant differences found between all other readings. The Dentaport ZX could not detect the minor foramen accurately but was able to indicate the major foramen in molars undergoing a root canal retreatment procedure.
Department of Endodontics, Faculty of Dentistry, Istanbul, Turkey.
Hale
H
Cimilli
Seda
S
Aydemir
Burcin
B
Arican
Gonca
G
Mumcu
Nicholas
N
Chandler
Nevin
N
Kartal
D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D055615:Electrical Equipment and Supplies / Q000706:statistics & numerical data; D004867:Equipment Design; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D008422:Materials Testing; D008963:Molar / Q000033:anatomy & histology*; D009811:Odontometry / Q000295:instrumentation* / Q000706:statistics & numerical data; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000706:statistics & numerical data; D019227:Tooth Apex / Q000033:anatomy & histology*
D012387:Root Canal Filling Materials; D006171:Gutta-Percha
apex locator; retreatment; working length