Comparison of conventional, rotary, and ultrasonic preparation, different final irrigation regimens, and 2 sealers in primary molar root canal therapy.
OBJECTIVE
The aim of this study was to compare the shaping effectiveness rotary nickel-titanium (Profile .04 ISO), ultrasonic (K-Type/Satelec), and stainless-steel hand file (K-file/Maillefer) instrumentation and to assess tubular penetration of 2 gutta percha sealers (AH Plus and Sealite-Ultra) following 4 different final irrigation regimens in primary molar roots.


METHODS
Distal roots of extracted human primary second molars were prepared with 1 of the 3 instrumentation techniques. Direct digital radiographs were obtained on a custom-made platform before and after instrumentations. The amount of dentin removal, canal transportation, centering of preparation, changes in root curvature and working length, and zip formation were evaluated using image analysis.


RESULTS
While no significant differences were found between the 3 preparation techniques in regards to dentin removal (P > .05), ultrasonic instrumentation significantly increased the incidence of zip formation (P < .05) and decreased working length (P < .05). Following final irrigation with 2.5% sodium hypochlorite (NaOCL), 10% ethylenediaminetetraacetic acid (EDTA), 17% EDTA, or distilled water (control), tubular penetration of the tested sealers were investigated under scanning electron microscope. Use of AH Plus after 17% EDTA irrigation exhibited the best tubular penetration.


CONCLUSIONS
Root canal preparation with Profile .04 ISO nickel titanium instruments can be a viable alternative to manual instrumentation in primary teeth. When used as a gutta percha sealer, AH Plus exhibits good tubular penetration when 17% EDTA is used for final flush.
Canoglu
Harun
H
Department of Pediatric Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Tekcicek
Meryem U
MU
Cehreli
Zafer C
ZC
D002614:Chelating Agents / Q000737:chemistry / Q000627:therapeutic use; D003722:Dental Alloys; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging / Q000473:pathology; D003804:Dentin / Q000000981:diagnostic imaging / Q000473:pathology; D004492:Edetic Acid / Q000737:chemistry / Q000627:therapeutic use; D004853:Epoxy Resins / Q000737:chemistry / Q000627:therapeutic use; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008855:Microscopy, Electron, Scanning; D008963:Molar / Q000000981:diagnostic imaging / Q000473:pathology*; D009532:Nickel; D011859:Radiography; D012387:Root Canal Filling Materials / Q000737:chemistry / Q000627:therapeutic use*; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*; D012390:Root Canal Therapy / Q000379:methods*; D012973:Sodium Hypochlorite / Q000737:chemistry / Q000627:therapeutic use; D013193:Stainless Steel; D013499:Surface Properties; D014025:Titanium; D014094:Tooth, Deciduous / Q000000981:diagnostic imaging / Q000473:pathology*; D014464:Ultrasonic Therapy / Q000295:instrumentation / Q000379:methods*; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry / Q000627:therapeutic use
D002614:Chelating Agents; D003722:Dental Alloys; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D015035:Zinc Oxide-Eugenol Cement; C534916:epoxy resin-based root canal sealer; C071465:sealite; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D004492:Edetic Acid; D014025:Titanium; D012973:Sodium Hypochlorite