000			03067cam a2200337 a 4500
003			EG-GiCUC
005			20250223031455.0
008			160416s2015 ua o f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.09.09.M.Sc.2015.Mo.E
100	0		_aMohammed Mahmoud Abuolwan
245	1	4	_aThe effect of internal and external surface treatments on biaxial flexural strength of enamic hybrid ceramics : _bAn in vitro study / _cMohammed Mahmoud Abu Olwan ; Supervised Rabab Mohamed Ibraheem , Maha Ahmed Taymour
246	1	5	_aتأثير المعالجات السطحية الداخلية والخارجية على قوة الانثناء الثنائى المحور للسيراميك المهجن الإيناميك : _bدراسة معملية
260			_aCairo : _bMohammed Mahmoud Abuolwan , _c2015
300			_a76 P. : _bphotographs ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics
520			_aAim of the present study was to evaluate the effect of internal surface treatment by hydrofluoric acid and silane and external surface treatment by hydrofluoric acid, silane, stain and glaze application on biaxial flexural strength of enamic hybrid ceramics. A total of sixteen disc shaped samples of enamic hybrid ceramic (8 mm in diameter and 2 mm in thickness) were designed and milled using CEREC 3 CAD / CAM system. The samples were classified into four groups according to type of surface treatments, Group I: no surface treatment (control) (n = 4), Group II: External surface treatment (n = 4), Group III : Internal surface treatment (n = 4) and Group IV: Both internal and external surface treatments (n = 4). All samples were polished and then cleaned ultrasonically in distilled water. The biaxial {uFB02}exural strength was measured by the piston on three ball test in a universal testing machine. Data presented as mean and standard deviation (SD). Independent t-test and one way ANOVA was used. The significance level was set at P {u2264} 0.05. Both external and internal surface treatments group(IV) showed highest flexural strength (128.44 ± 3.74 MPa). External surface treatment group(II) (124.67 ± 5.78 MPa) showed the higher significant mean biaxial flexural strength (MPa) compared to Internal surface treatment group (III) (100.11 ± 22.22 MPa) and control group (I) (84.97 ± 4.3 MPa) at p = 0.001. Both external and internal surface treatment of hybrid ceramics affect its flexural strength .Glaze and stain were considered as important surface treatments step to optimize strength of hybrid material
530			_aIssued also as CD
653		4	_aBiaxial flexural strength
653		4	_aHybrid ceramic
653		4	_aHydrofluoric acid
700	0		_aMaha Ahmed Taymour , _eSupervisor
700	0		_aRabab Mohamed Ibraheem , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aSamia _eCataloger
942			_2ddc _cTH
999			_c56041 _d56041