Effects of ultrasonic root end preparation on resected root surfaces: SEM evaluation.
OBJECTIVE
The purpose of this study was to investigate the in vitro effect of ultrasonic retrotips on root end surfaces.


METHODS
Root end resection was performed on 45 single-root teeth endodontically treated after extraction. Setting the ultrasonic device at full power, a retrograde cavity was made by a stainless steel tip in 9 specimens (SS-FP). In another 9 samples a diamond tip was used (D-FP). Setting the intensity of the ultrasonic device at half power, 9 specimens were treated using stainless steel tips (SS-HP) and 9 using diamond tip (D-HP). Nine teeth were only apically resected and used as controls. Histologic serial sections were examined by scanning electron microsope to assess the number of root-face cracking, the marginal quality, and the crack type.


RESULTS
No significant difference between diamond and stainless steel groups was found at a given power setting. Significant differences were found between SS-FP and SS-HP group for both the number of cracks and the marginal quality.
Taschieri
Silvio
S
Section of Endodontics, Department of Odontology, Galeazzi Institute, University of Milano, Milan, Italy.
Testori
Tiziano
T
Francetti
Luca
L
Del Fabbro
Massimo
M
D000293:Adolescent; D000328:Adult; D001047:Apicoectomy; D003786:Dental Pulp Cavity / Q000293:injuries / Q000648:ultrastructure*; D003804:Dentin / Q000293:injuries / Q000648:ultrastructure; D018130:Diamond; D004867:Equipment Design; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D012184:Retrograde Obturation; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*; D013193:Stainless Steel; D013499:Surface Properties; D019227:Tooth Apex / Q000293:injuries / Q000648:ultrastructure*; D014464:Ultrasonic Therapy / Q000295:instrumentation / Q000379:methods*
D013193:Stainless Steel; D018130:Diamond