000			03240cam a2200337 a 4500
003			EG-GiCUC
005			20250223032648.0
008			201228s2019 ua dho 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.2019.Ma.M
100	0		_aMarwa Magdy Abueleneen
245	1	0	_aMarginal accuracy of zirconium reinforced lithium silicate (VITA SUPRINITY) crowns with two marginal designs before and after cementation under thermomechanical cycling : _bIn vitro study / _cMarwa Magdy Abueleneen ; Supervised Gihan Abdelhady Elnaggar , Maha Ahmed Taymour
246	1	5	_aدقة الحواف لطرابيش سيراميك الليثيوم سيليكات المقوى بالزيركونيا (فيتا سبرينيتى) بخطين نهاية مختلفين قبل و بعد اللصق عند تعرضهم للضغط الحرارى الدورى : _bدراسة معملية
260			_aCairo : _bMarwa Magdy Abueleneen , _c2019
300			_a94 P. : _bcharts , facimiles , photoghrphs ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics
520			_aAim: This in vitro study was carried out to assess the marginal accuracy of VITA SUPRINITY crowns which were prepared with conservative feather edge margin design (intervention) compared to deep chamfer margin design (control). Materials and Methods: twenty crowns were constructed which were divided into two equal groups, Group (I): Ten crowns (n=10) fabricated with deep chamfer marginal design (control), Group (II): Ten crowns (n=10) fabricated with feather edge marginal design. Two stainless steel dies were constructed, one die was prepared with deep chamfer marginal design (0.7mm) and the other with feather edge marginal design (0.25mm). Then each die was duplicated into ten epoxy resin dies (for each group). After that, each die was scanned then crowns were milled. Crowns were then seated on their epoxy resin dies and then marginal gap was measured by scanning electron microscope (SEM). Crowns were then cemented by adhesive resin cement. All samples were subjected to thermo-mechanical aging. After that, marginal gap was then measured by the same way. Data was recorded, tabulated and statistically analyzed. Results: With regard to the effect of margin design, It was found that deep chamfer margin design recorded statistically non-significant higher marginal gap mean value (27.20 ± 3.52 æm) than feather edge design (26.21 ± 1.49 æm).Irrespective of the margin of preparation design, Marginal gap before cementation recorded lower mean value (11.89±2.13 æm) than after cementation under thermo-mechanical aging (41.97 ± 3.68 æm) and this was statistically significant as indicated by paired t-test (p=<0.0001< 0.05)
530			_aIssued also as CD
653		4	_aFeather edge finish line
653		4	_aGlass ceramics
653		4	_aMarginal fit
700	0		_aGihan Abdelhady Elnaggar , _eSupervisor
700	0		_aMaha Ahmed Taymour , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c79364 _d79364