The TRi Auto ZX(J. Morita Mfg. Corp. USA; Irvine, Calif.) is a cordless electric endodontic handpiece with a built in Root ZX Apex locator
The TRi Auto ZX(J. Morita Mfg. Corp. USA; Irvine, Calif.) is a cordless electric endodontic handpiece with a built in Root ZX Apex locator
The handpiece uses nickel-titanium rotary instrumentsthat rotate at 280 50 rpm.The position of the tip of the rotary instrument is continuously monitored on theLED control panel of the handpiece during the shaping and cleaning of the canal.The Tri Auto ZX has three automatic safety mechanisms. The handpiece automatically starts rotation whenthe instrument enters the canal and stops when the instrument is removed.Auto Start-Stop mechanism
The handpiece also automatically stops and\ reverses the rotation of the instrument when the torquethreshold (30 grams/centimeter) is exceeded the auto torque a reverse mechanism, a mechanism developedto prevent instrument breakage. In addition, the handpiece automatically stops and reverses rotation whenthe instrument tip reaches a distance from the apical constriction that has been preset by the clinician
Auto apical reverse mechanism, a mechanism controlled by the built-in Root ZX apex locator anddeveloped to prevent instrumentation beyond the apical constriction.The accuracy of the level of instrumentation with the Tri Auto ZX (J.Morita Mfg.Corp. USA; Irvine, Calif.)was reported in an
in vivo
study.In all cases, radiographs showed that the preinstrumentation workinglength was within 0.5 mm of the final instrument working length and without overextension of gutta-percha, instrument breakage, or canal transportation.
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