000			03367cam a2200337 a 4500
003			EG-GiCUC
005			20250223032531.0
008			200307s2019 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.09.10.M.Sc.2019.Ya.E
100	0		_aYasmeen Saad Aboelela Ali
245	1	0	_aEvaluation of color stability of amine free (NX3) versus amine containing (variolink) dual curable resin cements : _bA comparative in vitro study / _cYasmeen Saad Aboelela Ali ; Supervised Gihan Ali Helmy , Rasha Mohamed Abdelraouf
246	1	5	_aتقييم لاستقرار لون أسمنت الراتنج ثنائى الطبخ الخالى من مجموعة الأمين(ان اكس 3 ) مقابل أسمنت الراتنج ثنائى الطبخ المحتوى على مجموعة الأمين (فاريولينك: _bدراسة معملية مقارنة
260			_aCairo : _bYasmeen Saad Aboelela Ali , _c2019
300			_a82 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Dental Materials
520			_aThe study was performed to evaluate the color change of amine free dual cured resin cement (NX3) versus amine containing one; (Variolink) in three storage media (in air, distilled water and coffee) and time intervals (one week, two weeks and six weeks). Moreover, the degree of conversion and water sorption of both cements were also assessed. A total number of fifty eight discs of resin cement specimens were used. The specimens were divided into two main groups according to the type of resin cement used: Group 1 (control):amine containing Variolink II dual cure cement (n=29/gp), Group2: amine free NX3 dual cure cement (n=29/gp).In each group, three main tests were performed: I) Evaluation of color change (n=15), the specimens in each group were subdivided into three subgroups according to storage media: air, distilled water and coffee (n=5/subgp), II) Evaluation of degree of conversion (n=7/gp), each specimen was assessed at four time intervals: immediately after light curing, one hour, 24 hours and two weeks, III) Evaluation of water sorption (n=7/gp). For color change test, each specimen was evaluated using a spectrophotometer at three time intervals: a) After one week, b) After two weeks, c) After six weeks. In both air and distilled water Variolink II showed significantly higher mean color change value than NX3 after one and two weeks.This might be attributed to the chemical composition of Variolink II which contains tertiary amines as chemical activator for the polymerization reaction. However, within the coffee subgroup Variolink II showed the higher significant mean color change value than NX3 after one and six weeks{u2019} time interval but there was no significant difference between them after two weeks.This might be caused by presence of melanoidins in coffee which are water soluble
530			_aIssued also as CD
653		4	_aDual curable resin cements
653		4	_aNX3
653		4	_aVariolink
700	0		_aGihan Ali Helmy , _eSupervisor
700	0		_aRasha Mohamed Abdelraouf , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c76868 _d76868