fa مقایسه تاثیر سه تکنیک ترمیم کامپوزیت مستقیم ، بر میزان مقاومت به شکست دندان های پره مولر درمان ریشه شده مطالعه آزمایشگاهی جراحی- oral surgery مطالعه اصیل original article <p><font face="Times New Roman" size="3">&nbsp;</font></p> <h5 dir="rtl" style="margin: 0cm 0cm 0pt text-align: justify unicode-bidi: embed direction: rtl"><font size="3"><b><span b="" lang="FA" mso-ascii-font-family:="" mso-bidi-language:="" mso-hansi-font-family:="" new="" roman="" style="font-family: " times="">خلاصه:</span></b><b><span b="" dir="ltr" fa="" lang="FA" mso-bidi-font-family:="" mso-bidi-language:="" new="" roman="" style="font-family: " times="">&nbsp;</span></b></font></h5> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <h5 dir="rtl" style="margin: 0cm 0cm 0pt text-align: justify unicode-bidi: embed direction: rtl"><b><span b="" font="" lang="AR-SA" mso-ascii-font-family:="" mso-hansi-font-family:="" new="" roman="" size="3" span="" style="font-family: " times=""><font size="3">شکست دندان های اندو شده یکی از چالش های دندانپزشکی ترمیمی می باشد. دندان پره مولار به دلیل قرار گیری در معرض تنشهای استرسی کششی و شکل آناتومیکی نامناسب در معرض شکست بیشتری است. لذا هدف مطالعه حاضر مقایسه تاثیر مقاومت به شکست<span style="mso-spacerun: yes"><font face="B Nazanin">&nbsp;</font></span></font><font size="3">دندان&shy;های </font><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">پره مولر فک </font><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">بالا</font><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">که تحت درمان ریشه قرار گرفته&shy;اند می باشد.</font></span></b></h5> <p><b><font face="Times New Roman" size="3">&nbsp;</font></b></p> <h5 dir="rtl" style="margin: 0cm 0cm 0pt text-align: justify unicode-bidi: embed direction: rtl"><b><b><span b="" font="" lang="AR-SA" mso-ascii-font-family:="" mso-hansi-font-family:="" new="" roman="" size="3" span="" style="font-family: " times=""><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">این مطالعه به صورت تجربی و آزمایشگاهی بر روی60</font><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">دندان پره مولار فک بالا انجام شد که به طور تصادفی به 4 گروه 15 تایی تقسیم شدند و در 4 گروه کامپوزیت بدون باند، کامپوزیت + گلاس آینومر، کامپوزیت+باندو کامپوزیت + پست فایبر ترمیم شدند. </font><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">دندان ها به روش</font></span><span b="" dir="ltr" lang="AR-SA" mso-bidi-font-family:="" new="" roman="" style="font-family: " times=""><font size="3">&nbsp;</font></span><span dir="ltr" lang="X-NONE" style="font-size: 11pt"><font face="Times New Roman">MOD</font></span><span b="" dir="ltr" lang="X-NONE" mso-bidi-font-family:="" new="" roman="" style="font-family: " times=""><font size="3">&nbsp;</font></span><span .="" 1200000="" 30="" b="" dir="ltr" face="Times New Roman" font="" lang="AR-SA" mso-ascii-font-family:="" mso-bidi-font-family:="" mso-hansi-font-family:="" new="" roman="" size="3" span="" style="font-family: " times=""><font size="3">برای آنالیز </font></span></b></b></h5> <p><b><b><font face="Times New Roman" size="3">&nbsp;</font></b></b></p> <h5 dir="rtl" style="margin: 0cm 0cm 0pt text-align: justify unicode-bidi: embed direction: rtl"><b><b><font size="3"><b><span b="" lang="AR-SA" mso-ascii-font-family:="" mso-hansi-font-family:="" new="" roman="" span="" style="font-family: " times="">درکل گروهها و آزمون</span><span b="" dir="ltr" lang="AR-SA" mso-bidi-font-family:="" new="" roman="" style="font-family: " times="">&nbsp;</span></b></font><b><span dir="ltr" lang="X-NONE" style="font-size: 11pt"><font face="Times New Roman">TUKEY Post-hoc</font></span><span b="" dir="ltr" lang="X-NONE" mso-bidi-font-family:="" new="" roman="" style="font-family: " times=""><font size="3">&nbsp;</font></span><span .="" 1="" 4="" b="" dir="ltr" face="Times New Roman" font="" lang="AR-SA" mso-ascii-font-family:="" mso-bidi-font-family:="" mso-hansi-font-family:="" new="" p="0.000).</font" roman="" size="3" span="" style="font-family: " times="">همچنین الگوی شکست قابل ترمیم از گروه1 تا 4 روند افزایشی و برای الگوی غیر قابل ترمیم برعکس بود اما معنی دارنبود</span><span b="" dir="ltr" lang="X-NONE" mso-bidi-font-family:="" new="" roman="" style="font-family: " times="">(</span><span dir="ltr" lang="X-NONE" style="font-size: 11pt"><font face="Times New Roman">p>0.05).</font></span></b></b></b></h5> <p><b><b><b><font face="Times New Roman" size="3">&nbsp;</font></b></b></b></p> <h5 dir="rtl" style="margin: 0cm 0cm 0pt text-align: justify unicode-bidi: embed direction: rtl"><b><b><b><b><span b="" font="" lang="AR-SA" mso-ascii-font-family:="" mso-hansi-font-family:="" new="" roman="" size="3" span="" style="font-family: " times=""><span style="mso-spacerun: yes"><font face="B Nazanin" size="3">&nbsp;</font></span><font size="3">استفاده از فایبر پست به همراه کامپوزیت می تواند مقاومت به شکست دندان پره مولر اندو شده را فزونی بخشد اما الگوی شکست در این ترمیم ، بیشتر به صورت غیر قابل ترمیم می باشد. </font></span></b></b></b></b></h5> <p><b><b><b><b><font face="Times New Roman" size="3">&nbsp;</font></b></b></b></b></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">Background and aim:</span></b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times=""> Failure of restored teeth after endodontic treatment is one of the challenges faced in restorative dentistry. Premolar teeth are more likely to fracture due to exposure to tensile stress and inappropriate anatomical shape. Therefore, the aim of this study was the comparison of the fracture resistance of maxillary premolars which were restored with composite resin, composite resin with glass ionomer lining and composite resin reinforced with fiber post. </span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">&nbsp;</span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">Materials and Methods:</span></b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times=""><span style="mso-spacerun: yes"><font face="Times New Roman" size="2">&nbsp;</font></span>In this experimental study, 60 extracted human maxillary premolars were randomly divided into 4 groups of 15: Composite resin without bonding (1), Composite resin+ glass ionomer lining (2), Composite resin+ single bond 2 (3) and Composite resin+ Fiber post (4). The teeth were prepared by MOD design with palatal cusp reduction. The samples were placed in a chewing simulator and went under a 30 N force for 1200000 cycles. The threshold of compressive resistance was measured in MPa. Also, fracture patterns were assessed divided by restorability and non-restorability. ANOVA test was used for statistical analysis of data in all groups and post-hoc TUKEY test was used for two by two comparisons. </span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">&nbsp;</span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">Results: </span></b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">The threshold of force resistance significantly increased from group 1 to 4 and the difference among all groups was strongly significant (p = 0.000). Restorable fracture pattern followed an ascending order from group 1 to 4 which was reversed for unrestorable pattern with no significance. (P> 0.05) </span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">&nbsp;</span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">Conclusions: </span></b><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">Composite resin restoration reinforced with fiber post can increase the fracture resistance of endodontically treated premolars but the number of unrestorable fractures also increases with the use of these posts. Fracture strength and fracture patterns obtained through usage of composite resin restorations in endodontically treated teeth are appropriate.</span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> <p style="margin: 0cm 0cm 0pt text-align: justify"><span 10pt="" ar-ye="" font-size:="" mso-bidi-language:="" mso-fareast-font-family:="" new="" style="color: black line-height: 115% font-family: " times="">&nbsp;</span></p> <p><font face="Times New Roman" size="3">&nbsp;</font></p> رزین کامپوزیت , گلاس آینومر سمنت, دنتین باندینگ اجنت, گلاس فایبر,تنش شکست Composite Resins, Dentin-Bonding Agents, Glass Ionomer Cements, Post and Core Technique, Stress 206 214 http://jrds.ir/browse.php?a_code=A-10-916-1&slc_lang=fa&sid=1 H kazemi yazdi هاله کاظمی یزدی haleh1352@yahoo.com 10031947532846009591 10031947532846009591 Yes N Aryan نازنین آرین 10031947532846009592 10031947532846009592 No M SHahbazi moghadam مهیار شهبازی مقدم m_shahbazi@yahoo.com 10031947532846009593 10031947532846009593 No