fa تاثیر تغییر مساحت و شکل کانکتورهای پروتزهای ثابت سه واحدی زیرکونیا بر استحکام خمشی آنها پروتز Prothesis مطالعه اصیل original article <h3 dir="RTL" style="text-align:justify"><span style="font-size:8pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span bold="" new="" roman="" style="font-family:" times=""><span lang="AR-SA" style="font-size:10.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black">سابقه و هدف: </span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">در پروتزهای ثابت چند واحدی نواحی اتصال دهنده (</span></span></span></span><span dir="LTR" lang="X-NONE" style="font-size:11.0pt"><span style="color:black"><span style="font-weight:normal">Connector</span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">) به علت نازک بودن محل تجمع استرس و شکست می باشند و نیازمند تقویت هستند. هدف از این پژوهش بررسی تاثیر تغییر مساحت کانکتورهای پروتزهای ثابت سه واحدی زیرکونیا بر استحکام خمشی آن ها می باشد.</span></span></span></span></span></span></span></span></span></span></h3> <h3 dir="RTL" style="text-align:justify"><span style="font-size:8pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span bold="" new="" roman="" style="font-family:" times=""><span lang="AR-SA" style="font-size:10.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black">مواد و روش ها:</span></span></span> <span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">در این مطالعه&nbsp; تجربی- آزمایشگاهی 30 دندان مولر اول و پرمولر اول فک پایین به عنوان دندان های پایه برای پروتز</span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">FPD</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">&nbsp;&nbsp; روی مدل پلاستیکی فک آماده سازی شدند. نمونه های </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">FPD</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> از جنس زیرکونیا برای آنها در دو گروه با اشکال کانکتور </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">silhouette</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">&nbsp; و </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">elliptical</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> که هر گروه </span></span></span></span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">۳</span></span></span></span> <span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">زیرگروه با مساحت کانکتور </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">mm2 </span></span></span></span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">۸</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> تعداد نمونه ذکر شد.، </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">mm2 </span></span></span></span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">۱۰</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> و </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">mm2 </span></span></span></span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">۱۲</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> داشتند، با سیستم </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">CAD/CAM</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">&nbsp; ساخته شدند. نهایتا </span></span></span></span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">۵</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> نمونه در این</span></span></span></span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">۶</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> گروه در نظر گرفته شد. سپس نمونه ها سمان شده و&nbsp; استحکام خمشی آنها با دستگاه&nbsp; </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">universal testing machine</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">&nbsp; و تست خمش سه نقطه ای سنجیده شد. تحلیل واریانس دوطرفه و آزمون تعقیبی </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">LSD</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> در نرم افزار </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">SPSS</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> نسخه 22 برای آنالیز آماری استفاده شد. </span></span></span></span></span></span></span></span></span></span></h3> <h3 dir="RTL" style="text-align:justify"><span style="font-size:8pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span bold="" new="" roman="" style="font-family:" times=""><span lang="AR-SA" style="font-size:10.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black">یافته</span></span></span> <span lang="AR-SA" style="font-size:10.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black">ها:</span></span></span> <span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">با در نظر گرفتن سطح معنی داری 0/05</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">></span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">P</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> ، میزان استحکام خمشی در بین شکل ها </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">silhouette</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> و </span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">Elliptical</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> تفاوت معنی‌داری نداشت.</span></span></span></span> <span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">&nbsp;(0/339 =</span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">P</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">) میزان استحکام خمشی در مساحت 12 میلی متر مربع بطور معنی‌داری بیشتر از مساحت 8 و 10 میلی متر مربع بود.&nbsp; (0/001&nbsp;</span></span></span></span><span dir="LTR" style="font-size:11.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"><span style="font-weight:normal">P =</span></span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal"> )</span></span></span></span></span></span></span></span></span></span></h3> <h3 dir="RTL" style="text-align:justify"><span style="font-size:8pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span bold="" new="" roman="" style="font-family:" times=""><span lang="AR-SA" style="font-size:10.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black">نتیجه گیری</span></span></span><span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black">:</span></span></span> <span lang="AR-SA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"><span style="font-weight:normal">در پروتز های ثابت سه واحدی زیرکونیا تغییر مساحت کانکتورها برتاثیر چشمگیری بر استحکام خمشی دارد ولی شکل آنها&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;تاثیری ندارد.</span></span></span></span></span></span></span></span></span></span></h3> <h3 dir="RTL" style="text-align:justify"></h3> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b><span lang="EN" style="font-size:10.0pt">Background and Aim:</span></b> <span lang="EN" style="font-size:10.0pt">In multi-unit fixed prostheses, the connector areas are places where stress and failure accumulate due to thinness and need strengthening. The purpose of this research is to investigate the effect of changing the surface area of connectors of zirconia three-unit fixed prostheses on their bending strength.</span></span></span><br> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:10.0pt">Materials and Methods: </span></b><span style="font-size:10.0pt">&nbsp;In this experimental&nbsp; - laboratory study thirty, first molar and first premolar teeth of the lower jaw were prepared as base teeth for the FPD prosthesis on the plastic model of the jaw. Zirconia FPD samples were made for them in two groups with silhouette and elliptical connector shapes, each group having three subgroups with connector areas of 8 mm2, 10 mm2, and 12 mm2, with CAD/CAM system. Finally, 5 samples were considered in these 6 groups. Then, the samples were cemented, and their bending strength was measured with the universal testing machine and a three-point bending test.Two-way analysis of variance and LSD post hoc test were used in SPSS version 22 software for statistical analysis.</span></span></span><br> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:10.0pt">Result:</span></b> <span lang="EN" style="font-size:10.0pt">Considering the significance level of P value (P< 0.05), there is no significant difference in bending strength between silhouette and elliptical shapes (P value = 0.339). The bending strength in the area of 12 mm square is significantly higher than the area of 8 and 10 mm square (P value = 0.001).</span></span></span><br> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b><span lang="EN" style="font-size:10.0pt">Conclusion:</span></b><span lang="EN" style="font-size:10.0pt"> In fixed three-unit zirconia prostheses, changing the area has significant effect on the bending strength, but the shape has no effect.</span></span></span><br> <br> &nbsp; پروتز های دندانی, استحکام خمشی, طراحی شده با کمک کامپیوتر Dental Prostheses, Flexural Strengths, Computer-Aided Design 99 106 http://jrds.ir/browse.php?a_code=A-10-1915-1&slc_lang=fa&sid=1 Amin Nourizadeh امین نوری زاده nourizadeh.amin@gmail.com 100319475328460021557 100319475328460021557 No - گروه پروتز دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی تبریز، تبریز، ایران Mina Kahyaie Aghdam مینا کهیائی اقدم mina.kahyaie@yahoo.com 100319475328460021558 100319475328460021558 No - گروه دندانپزشکی ترمیمی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی تبریز ،تبریز، ایران Aref Mahmoudi عارف محمودی aref.mhmoudi@gmail.com 100319475328460021559 100319475328460021559 No - دندانپزشک عمومی Elnaz Shafiee الناز شفیعی E.shafiee@iau.ac.ir 100319475328460021560 100319475328460021560 No - گروه پروتز دندانی، دانشکده دندانپزشکی، دانشگاه آزاد علوم پزشکی تبریز، تبریز، ایران Vahid Fakhrzadeh وحید فخرزاده v.fakhrzadeh@gmail.com 100319475328460021561 100319475328460021561 Yes - گروه پروتز دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی تبریز، تبریز، ایران