title: An evaluation of Ektaspeed Plus film versus Ultraspeed film for endodontic working length determination.
abstract: Thirteen teeth in human cadaver sections were accessed and #15 K-files were placed at various lengths in one root canal of each tooth. Using a positioner to ensure duplicate views, radiographs were taken with both Ultraspeed and Ektaspeed Plus X-ray film. Each of the 26 radiographs was coded and then placed in random order. Six endodontic specialists measured the distance from the file tip to the radiographic apex on each film. The results were analyzed by analysis of variance and Cronbach's generalizability theory. It was found that 94% of the variance in measurements was due to differences among the viewers, whereas 5% was due to a combination of viewers and tooth. Only 1% was due to differences between the two types of film. It was concluded that Ektaspeed Plus film may be used for working length radiographs because it requires only approximately 50% of the radiation needed for Ultraspeed film.
authors.affiliation: Department of Endodontics, University of the Pacific School of Dentistry, San Francisco, CA, USA.
authors.forename: R
authors.initials: R
authors.lastname: Brown
authors.forename: J N
authors.initials: JN
authors.lastname: Hadley
authors.forename: D W
authors.initials: DW
authors.lastname: Chambers
mesh_terms: D000704:Analysis of Variance; D002102:Cadaver; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D005069:Evaluation Studies as Topic; D006801:Humans; D009811:Odontometry; D011859:Radiography; D011897:Random Allocation; D012390:Root Canal Therapy / Q000295:instrumentation / Q000379:methods; D014962:X-Ray Film / Q000706:statistics & numerical data