journal of research in dental sciences

fa تعیین تأثیر مقادیر مختلف انحراف دیستولبیالی ایمپلنت و اتچمنت Locator بر میزان گیر و طول عمر اوردنچرهای متکی بر ایمپلنت (Invitro) In vitro evaluation of the effect of disto-labially inclined implant and Locator attachment on retention and longevity of implant-supported overdentures جراحی- oral surgery مطالعه اصیل original article   <h5 dir="rtl" style="margin: 0cm 0cm 0pt text-align: justify unicode-bidi: embed direction: rtl">سابقه و هدف:مواد و روش‌ها:<span .="" 10="" 15="" 17="" 2="" 2000="" 30="" 3000="" 36="" 4="" 40="" 5="" 500="" 8="" b="" dir="rtl" face="Times New Roman" font="" h5="" lang="AR-SA" measure="" new="" repeated="" roman="" size="3" span="" style="font-family:" times="" utm="">نتیجه‌گیری: انحراف ایمپلنت و اتچمنت بر میزان گیر و طول عمر اتچمنت‌های اوردنچر مؤثر بوده به طوری که با افزایش زاویه انحراف تا 15 درجه، گیر اوردنچر بیشتر شده اما میزان سایش و افت گیر آنها نیز بالاتر می‌رود.</h5>     Background and aim:   Several problems have been reported regarding the retention and longevity of the attachments of implant-supported overdentures. Few studies are available in this regard. This in-vitro experimental study evaluated the effect of disto-labial inclination of implant and attachment on retention and longevity of implant-supported overdentures.           Materials and Methods:       In this experimental study, 40 specimens in 8 groups were evaluated. Four mandibular edentulous models and related dentures were identically fabricated. Two implant analogues (Dentium, South Korea) were placed in each model. Analogues were placed at disto-labial inclinations of 5, 10 and 15 degrees. In the control group, analogues were placed parallel and at 90 degrees angle to the edentulous ridge.   Locator abutment (Dentium, South Korea) with red retainer was placed on each implant analogue. Each specimen was loaded by 3000 insertion and removal and 2000 thermal cycles. The retention of each specimen was measured after each 500 cycles with UTM (SANTAM, STM20). Data were analyzed by Repeated Measure ANOVA and TUKEY tests.       Results:   The maximum initial retention before thermo-cycling was found in specimens with 5 degrees of inclination (36.4±1.51 N). After thermo-cycling, the maximum retention was found in specimens with 15 degrees of inclination (30.7±1.11 N). The minimum retention was recorded in the group with 10 degrees of inclination in both conditions (17.18± 0.92 N). No significant difference was found between 5 and 15 degrees inclinations according to Repeated Measure ANOVA and TUKEY tests. But the retention in these inclinations was significantly higher than 0 (control) and 10 degrees inclinations. (P<0.001)       Conclusion:       Inclination of implant and attachment has a positive effect on the retention and longevity of overdenture in a way that by increasing the inclination to 15 degrees, the retention increases but wear-down rate and retention loss also increase simultaneously.   اوردنچر متکی بر ایمپلنت, انحراف ایمپلنت و اتچمنت, گیر, طول عمر dental prosthesis, implant-supported, implant inclination, attachment, denture retention, longevity 196 205 http://jrds.ir/browse.php?a_code=A-10-744-2&slc_lang=fa&sid=1 S Jalalian صدرا جلالیان sadra_j82@yahoo.com 10031947532846009585 10031947532846009585 No H Ansari lari حمیرا انصاری لاری homeira2008@yahoo.com 10031947532846009586 10031947532846009586 Yes P Atashrazm پارسا آتش رزم p_atashrazm@sbmu.ac.ir 10031947532846009587 10031947532846009587 No SM Fatemi سید مصطفی فاطمی drfatemi@gmail.com 10031947532846009588 10031947532846009588 No mahya_baladi@yahoo.com 10031947532846009589 10031947532846009589 No shahrzad_rezvani64@yahoo.com 10031947532846009590 10031947532846009590 No