000			03519cam a2200313 a 4500
003			EG-GiCUC
008			211106s2021 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.24.04.M.Sc.2021.Em.R
100	0		_aEman Atef Hassan Kamal
245	1	0	_aRe-mineralization of enamel white spot lesions using 45S5 bioglass paste and Er, Cr: YsGG 2780 nm : _bIn vitro study / _cEman Atef Hassan Kamal ; Supervised Moastafa Essam Gheith , Dina Mohamed Mohamed Elsaid Hassouna
246	1	5	_aإعادة تمعدن بقعة الآفات البيضاء بطبقة المينا باستخدام معجون ال 45 اس 5 الزجاج النشط و ليزر اربيم كروم ياتريم اسكنديم جاليم جرانيت 2780 نانو متر: _bدراسة مخبرية
260			_aCairo : _bEman Atef Hassan Kamal , _c2021
300			_a114 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Laser Applications in Oral Surgery / Dentistry
520			_aBackground: White spot lesions (WSLs) are one of the most common problems which occur on tooth enamel surface around bonded brackets after prolonged orthodontic treatment. aim: Evaluate the effect of Er,Cr:YSGG (n = 2780 nm) laser and 45S5 bioactive glass (BAG) paste either alone or in combination with each other in re-mineralization of enamel WSLs. material and methods: Fifty enamel surface samples were prepared to acquire WSLs.There are 5 groups (n=10). Group 1, control samples; Group 2, 45S5 BAG paste treatment alone; Group 3, Er,Cr:YSGG laser irradiated (0.5 W, 20 Hz, 10 s) alone, Group 4, 45S5 BAG paste treatment applied before irradiation with same laser parameters in group 3 and Group 5, 45S5 BAG paste treatment applied after laser irradiation similar to group 3 and 4. The morphological changes of enamel texture, Methylene blue (M.B) dye penetration depth length and area were assessed by Stereomicroscope. Calcium (Ca), Phosphorous (P), Ca/P ratio and Carbon (C) mass%, were assessed by Energy Dispersive X-ray Analysis (EDXA), the results were statistically analyzed by ANOVA test using IBM SPSS software package version 20.0. (Armonk, NY: IBM Corp). results: EDXA revealed the highest Ca & Ca/P ratio mass% in group 4, highest P and least C mass% in group 5. There was no statistical significance between both group 4 & 5 in Ca, P, Ca/P ratio & C mass % results. Both groups 4 & 5 showed a significant difference increase in Ca, & P mass % and non-significant increase in Ca/P ratio mass % upon comparing them with other groups. A significant increase in C mass% was noticed in group 3 when compared to group 4 & 5, non- significant increase when compared to group 2 and significant decrease when compared to group 1.Stereomicroscopic results of outer enamel surface revealed that WSLs was reduced in group 2 and completely disappeared in group 3, 4 & 5. Where group 3 showed some cracks, group 4 showed less homogenous enamel surfaces and group 5 showed homogenous & translucent re- mineralized enamel surface
530			_aIssued also as CD
653		4	_aEnamel remineralization
653		4	_aEr,Cr:YSGG laser
653		4	_aWSLs
700	0		_aDina Mohamed Mohamed Elsaid Hassouna , _eSupervisor
700	0		_aMoastafa Essam Gheith , _eSupervisor
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c82992 _d82992