000			02961cam a2200337 a 4500
003			EG-GiCUC
005			20250223031523.0
008			160619s2015 ua d f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.09.03.M.Sc.2015.Ah.E
100	0		_aAhmed Tarek Farouk
245	1	4	_aThe effect of relative enamel : _bDentin shade thickness on the color outcome of resin composite systems / _cAhmed Tarek Farouk ; Supervised Mohamed Mahmoud Abdelmohsen , Ola Mohamed Ibrahim Fahmy
246	1	5	_aتأثير السمك النسبى للظل اللونى للمينا : _bالعاج على ناتج اللون لأنظمة راتنج الكمبوزت المختلفة
260			_aCairo : _bAhmed Tarek Farouk , _c2015
300			_a94 P. : _bcharts ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Operative Dentistry
520			_aThis study was conducted to evaluate the effect of relative thickness of different resin composite systems using enamel and dentin shades following the natural layering concept on the final color outcome. Ninety resin composite discs were assigned according to resin composite system into three groups of 30 discs each: Ceram X Duo (S1), filtek{u2122} Z350 XT (S2) and amaris® (S3). Each group was divided in to 3 subgroups (n = 10) according to the relative enamel (E): Dentin (D) thickness in to 0.5mm E: 1.5mm D (T1), 1 E: 1 D (T2), 1.5 E:0.5 D (T3) on top of 0.5mm thick basic enamel background as a standardized layer simulating the clinical condition. A vitapan A2 classical shade tab was used as a reference shade to which the different specimens of the three tested systems were compared. Color parameters (L*, a*, b*) and color difference ({u2206}E) were measured and calculated using an electronic shade detection device which is VITA Easyshade® Advance 4.0 over a black background. UV- shimadzu 3101 pc-spectrophotometer was also used in this study to confirm the results obtained by easyshade advance 4.0. The results were analyzed by analysis of variance (ANOVA)/Tukey's post hoc test (p < 0.05) for L*, b* and {u2206}E, while Kruskal{u2013}Wallis test followed by paired group comparisons using mann whitney U tests for a*. As the thickness of the enamel shade increased, the L* value decreased and the a* and b* values of the tested materials tended to shift towards the green and blue in the red-green axis and yellow-blue axis respectively. All tested composite systems at all thickness
530			_aIssued also as CD
653		4	_aDentin
653		4	_aRelative enamel
653		4	_aResin composite systems
700	0		_aMohamed Mahmoud Abdelmohsen , _eSupervisor
700	0		_aOla Mohamed Ibrahim Fahmy , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aSamia _eCataloger
942			_2ddc _cTH
999			_c56964 _d56964