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

AWT IMAGE
جشنواره سال 1388: نفرات برتر مقاله پژوهشی مواد دندانی

نفرات برتر مقالات پژوهشی مواد دندانی

.

نفر اول مقاله پژوهشی مواد دندانی

Effects of N-vinylpyrrolidone (NVP) containing polyelectrolytes on surface properties of conventional glass-ionomer

cements


 Moshaverinia A*, Roohpour N, Ansari S, Moshaverinia M, Schricker S , Darr J, Rehman I

Abstract

It has been found that polyacids containing an N-vinylpyrrolidinone (NVP ) comonomer produces a glass inomer cement with improved mechanical and handling properties. The objective of this study was to investigate the effect of NVP modified polyelectrolytes on the surface properties and shear bond strength to dentin of glass ionomer cements .

Poly(acrylic acid (AA)-co-itaconic acid (IA)-co-N-vinylpyrrolidone) was synthesized by free radical polymerization. The terpolymer was characterized using 1H NMR, FTIR spectroscopy and viscometry for solution properties. The synthesized polymers were used in glass ionomer cement formulations (Fuji II commercial GIC). Surface properties (wettability) of modified cements were studied by water contact angle measurements as a function of time. Work of adhesion values of different surfaces was also determined. The effect of NVP modified polyacid, on bond strength of glass-ionomer cement to dentin was also investigated. The mean data obtained from contact angle and bonding strength measurements were subjected to one- and two-way analysis of variance (ANOVA) at α=0.05 .

Results showed that NVP modified glass ionomer cements showed significantly lower contact angles (θ=47°) and higher work of adhesion (WA=59.4erg/cm 2) in comparison to commercially available Fuji II GIC (θ=60° and WA=50.3erg/cm2, respectively). The wettability of dentin surfaces conditioned with NVP containing terpolymer was higher (θ=21°, WA=74.2erg/cm2) than dentin conditioned with Fuji conditioner (θ=30°, WA=69erg/cm2). The experimental cement also showed higher but not statistically significant values for shear bond strength to dentin (7.8MPa), when compared to control group (7.3MPa). It was concluded that NVP containing polyelectrolytes are better dentin conditioners than the commercially available dentin conditioner (Fuji Cavity Conditioner , GC). NVP containing terpolymers can enhance the surface properties of GICs and also increase their bond strength to the dentin .


( Dental Materials , Volume 25, Issue 10, Pages 1240-1247)

*- College of Dentistry, The Ohio State University, Columbus, OH, USA

.

 نفر دوم مقاله پژوهشی مواد دندانی

PMMA-grafted nanoclay as novel filler for dental adhesives


 Atai M, Solhi L, Nodehi A, Mirabedini S.M, Kasraei SH, Akbari KH , Babanzadeh S


( Dental Materials 25, 2009, 339-347 ) 

 

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: 182
:. کاربران حاضر در وبگاه: 0
:. میهمانان در حال بازدید: 86
:. تمام بازدید‌ها: 14916822
:. بازدید 24 ساعت قبل: 3889

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

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

Created in : 0.24 seconds with 49 queries by YEKTAWEB