000			02852cam a2200337 a 4500
003			EG-GiCUC
005			20250223032455.0
008			191209s2018 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aPh.D
099			_aCai01.24.03.Ph.D.2018.Ah.E
100	0		_aAhmed Youssry Elhawary
245	1	0	_aEffect of Ercr: YSGG 2.7 nm laser on debonding of CAD/CAM endocrowns / _cAhmed Youssry Elhawary ; Supervised Ahmed Abbas , Tarek Harhash
246	1	5	_aتأثير اربيوم كروميوم ليزر على قوة الترابط لدى التيجان ذات تمديد بالقناة العصبية بمساعدة الحاسب الآلى
260			_aCairo : _bAhmed Youssry Elhawary , _c2018
300			_a83 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (Ph.D.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Lasers Application in Medical Biological
520			_aThe present study investigated the effect ErCr:YSGG laser on the debonding of all ceramic endocrown restorations. A total of 30 caries free human molar teeth were collected.All teeth were placed in epoxy resin by using a custom-made device.To standardize the preparation of all samples, decoronation of the teeth was done using a straight handpiece affixed to a surveyor and was done at a level 1mm above the cemento-enamel junction. Each abutment was scanned, and the copings were designed using interactive CAD software. An occlusal extension with an occlusal hole was added to the coping design to facilitate the coping removal during the test.Samples were then divided in to 2 groups: Group (A) (n=15): endocrowns subjected to ErCr:YSGG laser application.Group (B) (n=15): endocrowns not subjected to laser (control).After cementation of the samples, Group A was subjected to ErCr:YSGG laser application while Group B was not.Testing the samples All samples were then subjected to thermocycling at 5000 cycles, then the cemented specimens were mounted in a jig attached to a universal testing machine to measure the retentive pull out tensile load of the material. A tensile mode of force was applied via materials testing machine at a crosshead speed of 5 mm/min up to pull out the coping until cement failure. The maximum pull out load was recorded automatically in Newton via the computer software connected to the testing machine.Mode of failure was examined using photos with scanning electron microscope
530			_aIssued also as CD
653		4	_aCAD software
653		4	_aCAD/CAM
653		4	_aErcr: YSGG 2.7 nm laser
700	0		_aAhmed Abbas , _eSupervisor
700	0		_aTarek Harhash , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c75727 _d75727