000			03457nam a22003017i 4500
008			120326s2007 ua ||||f m 00| 0 eng d
040			_aEG-NcFUE _erda
041	0		_aeng _bara
082	0	4	_221 _a617 _bY.A.I
100	1		_aYassen, Asmaa Ali Mohamed _eauthor
245	1	0	_aInfluences of novel bonding approaches on demineralized dentin substrate / _cBy Asmaa Ali Mohamed Yassen ; supervisors Enas Mohamed Mohy El-Din, Heba Salah El-Din Hamza.
246	3	5	_aتأثير الطرق المستحدثة للربط على نسيج العاج الفاقد للأملاح
264		1	_c2007
300			_a164, [20] pages : _billustrations ; _c30 cm
336			_atext _2rdacontent
337			_aunmediated _2rdamedia
338			_avolume _2rdacarrier
500			_aSupervisors: Enas Mohamed Mohy El-Din, Heba Salah El-Din Hamza.
502			_aThesis (Ph. D.)Cairo University, Faculty of Oral and Dental Medicine, Department of Operative Dentistry, 2007.
504			_aIncludes bibliographical references (pages 153-164)
520			_aThis investigation was conducted to study the effect of some different novel bonding approaches on the demineralized dentin substrate. The dentin was demineralized using a specially prepared solution to obtain a natural like carious lesion. A total of 160 freshly extracted sound human molars were selected and used in this study , teeth were unequally divided into three groups according to the test used either microleakage testing , chemical analysis or scanning electron microscopic examination . Each group was further subdivided into two equal subgroups according to the bonding system used either total etching or self etching bonding system. Each subgroup was further subdivided into four equal classes according to the pretreatment material used either the bonding system as described by the manufacture without additional pretreatment (control), deproteinization with sodium hypochlorite NaOCL followed by ascorbic acid as a reducing agent , the use of Copper chloride or Zinc Zeolite . For the microleakage testing, standardized class V cavities were
520			_aprepared on the buccal surface of the selected molars. Cavities were then demineralized and treated with the corresponding type of treatment and then restored using resin composite. Restored teeth were warped, immersed in the dye for 2 hours and then sectioned. Microleakage assessment was done by two methods. The first was the dye penetration using the scoring system (0-3) and the second was measuring the gap area in µm2 at the tooth restoration interface by image analysis. Chemical analysis was done by cutting dentin specimens 3 x 2 x 1mm in dimension from the mesial and distal side of the selected molars. Specimens were demineralized by the demineralizing solution and then treated with the corresponding type of treatment. Treated demineralized dentine specimens were totally crushed and added to potassium bromide KBR powder to obtain a final concentration of 1.5% Discs were formed from the prepared mixture and then subjected to Fourier transform infrared spectroscopy (FTIR). Spectra obtained from the FTIR were analyzed and studied to know the chemistry of the formed interface.
546			_aText in English; abstracts in English and Arabic
653			_ademineralized dentin substrate.
700	1		_aHamza,Heba Salah El-Dein _925652 _esupervisor
700	1		_aMohy El Din,Enas Mohamed _925653 _esupervisor
942			_cTHESIS
999			_c5763 _d5763