Deflection of conventional versus nondeflecting dental needles in vitro.
Deflection of conventional and newly introduced nondeflecting dental local anesthetic needles were compared in vitro by radiographic examination of the course of the needles in a hydrocolloid impression material. Results indicated significantly less deflection of the new needles when compared to a variety of conventional needles. Controlled clinical trials will be required to test the significance of this finding.
D000766:Anesthesia, Dental / Q000295:instrumentation*; D004867:Equipment Design; D009339:Needles; D013314:Stress, Mechanical