- All Journals
- Al-Qadisiyah University
- Basrah University
- Kirkuk University
- Mosul University
- The Iraqi Borad for Medical Specialization
- University of Anbar
- University of Technology
- Al Mustafa University
- Al-Zahraa University for Women
- Alnoor University
- Kunooz University
- Misan University
- Ninevah University
- Tikrit University
- University of Al-Hamdaniya
- University of Kerbala
Water sorption of newly formulated resin-modified and conventional glass ionomer cements | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 22, Issue 4, 2010, Pages 28-31 | ||
| Authors | ||
| Shatha S.Al-Ameer; Saad S.Rahmatallah; Monadle R. Hadi | ||
| Abstract | ||
| ABSTRACTBackground: Chemical bonding of glass ionomer cements to tooth structure may be affected by dimensionalchanges associated with water absorbed by the material when it is in service inside the oral environment. The aim ofthis work was to measure the amount of water absorbed by new formulated cements and compare it with cementswith old formula and two commercial cements.MATERIALS AND METHODS: Four types of cements were prepared, two were resin-modified light-cured(1 and 2)andtwo were conventional chemical-cured (4 and 5). Two commercial cements were used, the first was light-curedcement 3 (Vivaglass) and the second was chemical-cured cement 6 (Nikang). Five specimens with 9mm diameterand 4mm height were produced for each type of cement. The weight of each specimen was recorded after 24hours before immersing in distilled water using very sensitive weight measuring balance with a precision ± 2 mg. Adesiccator was used to absorb water from the specimen material for 24 hours. Then the weight of each specimenwas recorded. The specimens were immersed in 20 milliliters of distilled water at room temperature (25ºC ± 2). Theweight of each specimen was then recorded after different immersing times of five minutes, 10 minutes, 15 minutes,30 minutes, 60 minutes, one day, three days, one week, 10 day, and two weeks, until no more water absorbed. Thevalue of water sorption was calculated and the final value was rounded to the nearest 0.1mg/cm2.RESULTS: Resin modified cements showed higher values of water sorption than those of conventional types of glassionomer cements. The highest value of short-term water sorption test was recorded for cements (5) followed bycement (2). While the lowest value of water sorption was recorded for cement (3)CONCLUSSION: Resin-modified cements absorb more water than conventional cements. Changing the powderformula had no clear effect on water sorption, while the resinous components of the liquid had direct effect onwater sorption of the tested cements.Key words: Water sorption, resin-modified glass ionomer cement, conventional glass ionomer cement. (J Bagh CollDentistry 2010;22(4):28-31). | ||
|
Statistics Article View: 201 PDF Download: 110 |
||