نام کاربری :
رمز عبور :
  به خاطر بسپار
کلمه عبور را فراموش کرده ايد؟
ثبت نام کاربر جديد
AWT IMAGE

AWT IMAGE
جشنواره سال 1394: نفرات برتر مقاله پژوهشی دندانپزشکی ترمیمی

نفرات برتر مقاله پژوهشی دندانپزشکی ترمیمی

.

نفر اول مقاله پژوهشی دندانپزشکی ترمیمی

Evaluation of fracture toughness and mechanical properties of ternary thiol-ene methacrylate systems as 

resine matrix for dental restorative composites


Saeed Behgi,Hamid Yeganeh, Mohammad Atai*

*Iran Polymer and petrochemical Institute,Tehran,Iran


Abstract

Objective: Study and evaluation of fracture toughness, flexural and dynamic mechanical properties, and crosslink density of ternary thiol–ene–methacrylate systems and comparison with corresponding conventional methacrylate system were considered in the present study.

Methods: Urethane tetra allyl ether monomer (UTAE) was synthesized as ene monomer. Different formulations were prepared based on combination of UTAE, BisGMA/TEGDMA and a tetrathiol monomer (PETMP). The photocuring reaction was conducted under visible light using BD/CQ combination as photoinitiator system. Mechanical properties were evaluated via measuring flexural strength, flexural modulus and fracture toughness. Scanning electron microscopy (SEM) was utilized to study the morphology of the fractured specimen’s cross section. Viscoelastic properties of the samples were also determined by dynamic mechanical thermal analysis (DMTA). The same study was performed on a conventional methacrylate system. The data were analyzed and compared by ANOVA and Tukey HSD tests (significance level = 0.05).

Results: The results showed improvement in fracture toughness of the specimens containing thiol–ene moieties. DMTA revealed a lower glass transition temperature and more homogenous structure for thiol–ene containing specimens in comparison to the system containing merely methacrylate monomer. The flexural modulus and flexural strength of the specimens with higher thiol–ene content were lower than the neat methacrylate system. The SEM micrographs of the fractured surface of specimens with higher methacrylate content were smooth and mirror-like (shiny) which represent brittle fracture.

Significance: The thiol–ene–methacrylate system can be used as resin matrix of dental composites with enhanced fracture toughness in comparison to the methacrylate analogous.

Keywords: Dental composites , Resin matrix , Thiol–ene system , Mechanical properties , Fracture toughnes


Lasers Med Sci. 2014 May 9

.

نفر دوم مقاله پژوهشی دندانپزشکی ترمیمی

A Randomized Clinical trial of the effect of low-level laser therapy before composit placement on postoperative sensitivity in class V restorations


Horieh Moosavi,Fatemeh Maleknejad, Mahsa Sharifi,Farzaneh Ahrari*


Lasers Med Sci. 2014 May 9



بایگانی مطالب:

مطالب کدام بخش سایت بیشتر مورد نیاز شماست؟
پرسش و پاسخ
جشنواره شهید هدایت
کلینیک تخصصی دندانپزشکی
مجله علمی
نمایشگاه کتاب
نمایشگاه مواد و تجهیزات دندانپزشکی
نیازمندیها
   
:. کل کاربران ثبت شده: 168
:. کاربران حاضر در وبگاه: 0
:. میهمانان در حال بازدید: 12
:. تمام بازدید‌ها: 7250227
:. بازدید 24 ساعت قبل: 2329

کلیه حقوق این وب سایت متعلق به جامعه اسلامی دندانپزشکان می باشد.

صفحه اصلی | درباره ما | ارتباط با ما | نقشه سایت

Created in : 0.55 seconds with 51 queries by YEKTAWEB