en پروتزهای دندانی Prothtodontics پژوهشي Research <b> Objective</b>: High variability in delivering the target torque is reported for friction-style mechanical torque limiting devices (F-S MTLDs). The effect of aging (number of use) on the accuracy of these devices is not clear. The purpose of this study was to assess the effect of aging on the accuracy (+ 10% of the target torque) of F-S MTLDs. <div>  <b>Materials and Methods</b>: Fifteen new F-S MTLDs and their appropriate drivers from three different implant manufacturers (Astra Tech, Biohorizon and Dr Idhe), five for each type, were selected. The procedure of peak torque measurement was performed in ten sequences before and after aging. In each sequence, ten repetitions of peak torque values were registered for the aging procedure. To measure the output of each device, a Tohnichi torque gauge was used.</div><div><b> Results</b>: Before aging, peak torque measurements of all the devices tested in this study falled within 10% of their preset target values. After aging, a significant difference was seen between raw error values of three groups of MTLDs (P<0.05). More than 50% of all peak torque measurements demonstrated more than 10% difference from their torque values after aging. </div><div>  <b>Conclusion</b>: Within the limitation of this study, aging as an independent factor affects the accuracy of F-S MTLDs. Astra Tech MTLDs presented the most consistent torque output for 25 Ncm target torque.</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Journal of Dentistry of Tehran University of Medical Sciences<span style="font-size: 15.5pt line-height: 115% font-family: Verdana, sans-serif color: rgb(250, 250, 250) background-color: rgb(101, 111, 115) background-position: initial initial background-repeat: initial initial"><o:p /></span></p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://jdt.tums.ac.ir/index.php/jdt/article/view/661" target="_blank"><font color="#0000ff">Full Text</font></a></p> Dental Implants; Aging; Torque 0 0 http://idai.ir/browse.php?a_code=A-10-32-966&slc_lang=en&sid=1 Aboulfazl Saboury 10031947532846004200 10031947532846004200 No Dental Research Center, Research Institute of Dental Sciences of Shahid Beheshti University of Medical Sciences, Tehran, Iran/Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran Seyed Jalil Sadr 10031947532846004201 10031947532846004201 No Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran Ali Fayaz 10031947532846004202 10031947532846004202 No Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran Minoo Mahshid mdmahshid@yahoo.com 10031947532846004203 10031947532846004203 Yes Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran