chemical stability of bioglass in simulated oral environment
نویسندگان
چکیده
statement of problem: bioglasses are a series of biocompatible dental materials, which are considered as light conducting inserts in resin composite restorations. consequently, their chemical stability is more essential when they are used in conjunction with resin composite. objectives: the aim of this study was to evaluate and compare the chemical stability of bioglass with dental porcelain and resin composite by determining the amount of released k+, na+, ca2+ ions and silicone elements from these materials as a result of exposure to tested solutions with different ph levels including: sodium bicarbonate [sb, (ph=9.2)], sodium buffer lactate [sbl, (ph=2.4)], acetic acid [aa, (ph=2.4)], and distilled water [dw, (ph=6.2)]. materials and methods: in this experimental study, forty 2.0 × 4.0 cylindrical rods for each tested material group (dental porcelain, resin composite and bioglass) were prepared. they were divided into four subgroups of 10 rods each, which immersed in one of the four testing solutions in a designated container. the containers were stored at 50°c and 100% humidity for one week. the released ions were measured by using a spectrophotometer (µg/cm2/ml). the data were statistically analyzed by nonparametric kruskal-wallis h test. results: it was observed that the tested materials released ions at different levels of concentration. the significant amounts of sodium, calcium, and silicon ions release were measured in bioglass subgroups in all the tested solutions ( p < 0.001). potassium ion release from dental porcelain was the largest in all solutions except for aa in which bioglass had the greatest potassium ion release ( p < 0.001). conclusions: a greater structural instability was observed for biogalss group than dental porcelain and composite in testing solutions with different ph levels.
منابع مشابه
Chemical Stability of Bioglass in Simulated Oral Environment
STATEMENT OF PROBLEM Bioglasses are a series of biocompatible dental materials, which are considered as light conducting inserts in resin composite restorations. Consequently, their chemical stability is more essential when they are used in conjunction with resin composite. OBJECTIVES The aim of this study was to evaluate and compare the chemical stability of Bioglass with dental porcelain an...
متن کاملmesuring the staff technology readiness, the case of a multi national chemical company operating in iran
چکیده ندارد.
15 صفحه اولepidemiological study of oral and pharyngeal cancers in kermanshah province from march 1993 to march 2006
چکیده ندارد.
15 صفحه اولstability and attraction domains of traffic equilibria in day-to-day dynamical system formulation
در این پژوهش مسئله واگذاری ترافیک را از دید سیستم های دینامیکی فرمول بندی می کنیم.فرض کرده ایم که همه فاکتورهای وابسته در طول زمان ثابت باشند و تعادل کاربر را از طریق فرایند منظم روزبه روز پیگیری کنیم.دینامیک ترافیک توسط یک نگاشت بازگشتی نشان داده می شود که تکامل سیستم در طول زمان را نشان می دهد.پایداری تعادل و دامنه جذب را توسط مطالعه ویژگی های توپولوژیکی تکامل سیستم تجزیه و تحلیل می کنیم.پاید...
An Approach to the Design of a Particulate System for Oral Protein Delivery .II. Preparation and Stability Study of rhGH-Loaded Microspheres in Simulated Gastrointestinal Fluids
The delivery of therapeutic proteins has gained momentum with development of biotechnology. However, large molecular weight, hydrophilic nature and susceptibility to harsh environment of gastrointestinal tract (GIT) resulted in low absorption. The main objective of this work was the design of a particulate system for oral delivery of recombinant human growth hormone (rhGH) on the basis of parti...
متن کاملAn Approach to the Design of a Particulate System for Oral Protein Delivery .II. Preparation and Stability Study of rhGH-Loaded Microspheres in Simulated Gastrointestinal Fluids
The delivery of therapeutic proteins has gained momentum with development of biotechnology. However, large molecular weight, hydrophilic nature and susceptibility to harsh environment of gastrointestinal tract (GIT) resulted in low absorption. The main objective of this work was the design of a particulate system for oral delivery of recombinant human growth hormone (rhGH) on the basis of parti...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
journal of dental biomaterialsجلد ۳، شماره ۳، صفحات ۰-۰
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023