مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

طراحی و ساخت یک پین‌جت ارزان‌قیمت با استحکام و چسبندگی مناسب به رزین آکریلیک

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشگاه یزد
چکیده
در حین انجام درمان ریشه دندان (عصب‌کشی) ممکن است همه یا بخشی از تاج دندان از بین برود. پست‌وکور یکی از روش‌های ترمیم تاج آسیب‌دیده است که در آن، از یک پین‌جت آغشته‌ به رزین آکریلیک جهت قالب‌گیری از کانال دندان و ساخت پست‌وکور ریختگی استفاده می‌شود. هدف اصلی در این مقاله تولید پین‌جتی ارزان‌قیمت با استحکام مورد نیاز و چسبندگی مناسب به رزین آکریلیک است. در این راستا، تعیین جنس مناسب برای پین‌جت اهمیت بالایی دارد که در نتیجه، آزمون‌های برشی لب‌روی‌هم و کشش بر روی هشت ماده پلیمری انجام شد تا به‌ترتیب، چسبندگی پین‌جت به رزین آکریلیک و استحکام تسلیم آن بررسی شود. برای ساخت پین‌جت، یک قالب تزریق پلاستیک ساخته شد و برای تعیین پارامتر‌های فرآیند تزریق، از نرم‌افزار مولدفلو اینسایت برای شبیه‌سازی استفاده گردید. نتایج نشان داد که ماده پلی‌استایرن مقاوم به ضربه (HIPS 7240) با کم‌ترین قیمت در بین مواد بررسی‌شده و چسبندگی کافی به رزین آکریلیک برای جنس پین‌جت مناسب است. هم‌چنین، این ماده با استحکام تسلیم 91/10 مگاپاسکال، از استحکام مناسب به‌منظور جلوگیری از تغییرشکل پلاستیک حین فرآیند قالب‌گیری پست‌وکور برخوردار بود. در حالی که زمان تزریق، دمای مذاب و دمای قالب در دو روش شبیه‌سازی و تجربی برابر و به‌ترتیب 1 ثانیه، 230 و 25 درجه سانتی‌گراد در نظر گرفته شد، فشار تزریق در روش شبیه‌سازی و تجربی به‌ترتیب 19 و 18 مگاپاسکال و سرعت تزریق به‌ترتیب 3/0 و 27/0 سانتی‌متر بر ثانیه به دست آمد. تولید بدون‌عیب پین‌جت نشان از دقت شبیه‌سازی در پیشنهاد پارامترهای فرآیندی تزریق پلاستیک است.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Designing and manufacturing an inexpensive pinjet with suitable strength and adhesion to acrylic resin

نویسندگان English

Mohammad Abbasi Khatoon Abadi
Roohollah Azizi Tafti
Yazd University
چکیده English

During root canal treatment, whole or a part of the tooth crown may be lost. Post and core is a method of repairing a damaged crown, in which a pinjet dipped in acrylic resin is used to mold the tooth canal and make a cast post and core. The main goal of this research is to produce an inexpensive pinjet with required strength and proper adhesion to acrylic resin. Therefore, to determine a right material for pinjet, lap shear and tensile tests were performed on eight polymer materials to check the adhesion of pinjet to acrylic resin and its yield strength, respectively. To produce some pinjets, a plastic injection mold was built and Moldflow Insight software was used to determine the process parameters of the injection molding. The results showed that HIPS 7240 with the lowest price among the examined materials and sufficient adhesion to acrylic resin is a suitable material for the pinjet. Also, this material with a yield strength of 10.91 MPa had an appropriate strength to prevent plastic deformation during the post and core molding process. While the injection time, melt temperature, and mold temperature were considered to 1 s, 230 ˚C, and 25 ˚C, respectively in both simulation and experimental methods, the injection pressure was 19 and 18 MPa and the injection speed was obtained 0.3 and 0.27 cm/s respectively in the simulation and experiments. Producing a perfect pinjet shows the ability and accuracy of the simulation in proposing the process parameters of plastic injection molding.

کلیدواژه‌ها English

Inexpensive pinjet
acrylic resin adhesion to pinjet
strength of pinjet
HIPS 7240
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