title: In vivo debridement efficacy of ultrasonic irrigation following hand-rotary instrumentation in human mandibular molars.
abstract: This study histologically compared the in vivo debridement efficacy of hand/rotary canal preparation versus a hand/rotary/ultrasound technique in mesial root canals of vital mandibular molars. Group 1 consisted of 16 teeth prepared with a hand/rotary technique whereas group 2 consisted of 15 teeth prepared in similar fashion but followed by 1 min of ultrasonic irrigation, per canal, utilizing an ultrasonic needle in a MiniEndo unit. Five uninstrumented mandibular molars served as histologic controls. After extraction and histologic preparation, 0.5 microm cross-sections, taken every 0.2 mm from the 1- to 3-mm apical levels, were evaluated for percentage of tissue removal. Nonparametric analysis revealed mean percent canal and isthmus cleanliness values to be significantly higher for group 2 at all levels evaluated, except one. In conclusion, the 1 min use of the ultrasonic needle after hand/rotary instrumentation resulted in significantly cleaner canals and isthmuses in the mesial roots of mandibular molars.
authors.affiliation: Department of Endodontics and Oral Biology, The Ohio State University, Columbus, OH 43218, USA.
authors.forename: Rubin
authors.initials: R
authors.lastname: Gutarts
authors.forename: John
authors.initials: J
authors.lastname: Nusstein
authors.forename: Al
authors.initials: A
authors.lastname: Reader
authors.forename: Mike
authors.initials: M
authors.lastname: Beck
mesh_terms: D006801:Humans; D011446:Prospective Studies; D012388:Root Canal Irrigants / Q000008:administration & dosage*; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods*; D016037:Single-Blind Method; D016369:Smear Layer; D012973:Sodium Hypochlorite / Q000008:administration & dosage*; D018709:Statistics, Nonparametric; D014465:Ultrasonics
chemical_list: D012388:Root Canal Irrigants; D012973:Sodium Hypochlorite