Effect of ethylenediaminetetraacetic acid on root fracture with respect to concentration at different time exposures.
BACKGROUND
The objective of this study was to evaluate the effect of ethylenediaminetetraacetic acid (EDTA) on root fracture with respect to various concentrations at different time exposures.


METHODS
A total of 48 mandibular incisors were selected. Eight nonprepared roots were selected as a negative control. The remaining 40 specimens were instrumented with rotary files and randomly assigned to one of the following groups for final irrigation: (1) 10 mL distilled water for 10 minutes (positive control); (2) 10 mL of 17% EDTA for 1 minute + 10 mL of 1% NaOCl for 1 minute; (3) 10 mL of 5% EDTA for 1 minute + 10 mL of 1% NaOCl for 1 minute; (4) 10 mL of 17% EDTA for 10 minutes + 10 mL of 1% NaOCl for 1 minute; (5) 10 mL of 5% EDTA for 10 minutes + 10 mL of 1% NaOCl for 1 minute. Thereafter, the root canals were filled by using AH26 root canal sealer with a single-cone technique. The specimens were loaded vertically at 1 mm/min crosshead speed until vertical root fracture occurred. Results were evaluated statistically with 1-way analysis of variance and Student's t test.


RESULTS
Statistically significant differences were detected among the groups (P < .05). The highest mean fracture resistance was obtained from the group treated with 5% EDTA for 10 minutes. This is about 2 times more than the weakest mean fracture resistance, which was obtained from the 17% EDTA-10 minute group.


CONCLUSIONS
The fracture resistances of endodontically treated roots were found to be differently affected by the various concentrations of EDTA at different time exposures.
Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey. emel.uzunoglu@hacettepe.edu.tr
Emel
E
Uzunoglu
Sevinc
S
Aktemur
M Ozgur
MO
Uyanik
Veli
V
Durmaz
Emre
E
Nagas
D001729:Bismuth / Q000627:therapeutic use; D003799:Dental Stress Analysis / Q000295:instrumentation; D004492:Edetic Acid / Q000008:administration & dosage*; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D006813:Humidity; D007180:Incisor / Q000187:drug effects; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012388:Root Canal Irrigants / Q000008:administration & dosage*; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D012834:Silver / Q000627:therapeutic use; D012973:Sodium Hypochlorite / Q000008:administration & dosage; D013314:Stress, Mechanical; D013997:Time Factors; D014025:Titanium / Q000627:therapeutic use; D014082:Tooth Fractures / Q000503:physiopathology*; D014092:Tooth Root / Q000187:drug effects*; D019553:Tooth, Nonvital / Q000503:physiopathology / Q000628:therapy
D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D012834:Silver; C028044:epoxy resin AH-26; D006171:Gutta-Percha; D004492:Edetic Acid; D014025:Titanium; D012973:Sodium Hypochlorite; D001729:Bismuth