title: In vitro study of anti-suck-back ability by themselves on new high-speed air turbine handpieces.
abstract: The anti-suck-back ability of five new high-speed air turbine handpiece models was evaluated in this study. First, suck-back pressure with water displacement within a glass tube was measured. Next, under three different conditions, how many on-off times it takes before fluorescent stains became visible on a piece of gauze at the exhaust vent was counted and the presence of fluorescent stains on the exhaust vents itself was examined. As a result, the water height for each part of one handpiece, the TWINPOWER TURBINE PAR-4HX-O, was below 0 mm. Except for under full emersion, this model, the TWINPOWER TURBINE PAR-4HX-O, did not have any visible fluorescence penetration to the exhaust vent even after 500 on-off switches under fume/mist conditions. Conversely, the other handpieces (Ti-Max X700L, T1 CONTROL, SYNEA TA-98CLED, GENTLE silence LUX 8000B) showed suck-back. In conclusion, the first mentioned new turbine handpiece, the TWINPOWER TURBINE PAR-4HX-O, had a possibility of no suck-back by itself. However, full immersion of the whole head of the handpiece which is not completely sealed must be avoided to prevent liquid intake.
authors.affiliation: Department of Periodontics and Endodontics, Tsurumi University School of Dental Medicine, Yokohama, Japan. ozawa-t@tsurumi-u.ac.jp
authors.forename: Toshiko
authors.initials: T
authors.lastname: Ozawa
authors.forename: Masako
authors.initials: M
authors.lastname: Nakano
authors.forename: Takashi
authors.initials: T
authors.lastname: Arai
mesh_terms: D000336:Aerosols; D003754:Dental High-Speed Equipment; D004866:Equipment Contamination / Q000517:prevention & control; D004867:Equipment Design; D005456:Fluorescent Dyes; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D011312:Pressure; D012399:Rotation; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000336:Aerosols; D005456:Fluorescent Dyes