الفهرس 
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Abstract
The Recently introduced computer aided design/ computer aided manufacturing (CAD/CAM) materials have overcome volume defects and voids found in conventionally sintered porcelain which allow them to have better tensile strength. Moreover, this evolving technology has opened new horizons to provide more accurate, highly esthetic and low time consumption restorations.
Dental ceramics are widespread for inlays and onlays. When ceramic restorations are inserted in cavities being completely surrounded by enamel, their clinical prognosis is excellent. In deeper proximal boxes, clinical data are scarce, but still positive.
The clinical problem with these areas is that rubber dam application may be as difficult as moisture control over a certain period, being considerably longer than with direct resin composite restorations. It may be a possible answer to the problem of relocating deep proximal areas with a small amount of resin composite in order to facilitate rubber dam application and adhesive luting.
Controversy exists regarding the validity of marginal relocation procedure, and whether elevating material properties can influence marginal and internal adaptation in the area surrounding CMR. Dietschi et al [22]. found that materials with an intermediate elastic modulus such as flowable composites had a more favorable marginal adaptation compared with rigid materials.
Using of dental dam provides good control of the restoration area and access to the preparation but in many situations its use is precluded. Therefore, alternative methods of controlling moisture and blood might be considered.
Haemostatic agents are preferred astringents among dentists because of minimum tissue damage, ease of use and effective results. But they are highly acidic materials and previous research [105-107] studied its negative effect on micro-leakage and bond strength and have reached different results.
So, this study had tested the effect of cervical margin relocation and haemostatic agent contamination on the marginal integrity of the restorations using two approaches: scanning electron microscope analysis and microleakage analysis.
relocation procedure performed using two different elevating materials of flowable consistency: conventional and bulk fill flowable composite resin. Haemostatic agent contamination was done using aluminum chloride compound.
Within the limitations of this study, the following could be concluded.
1- There is no difference in margin adaptation between ceramic restorations directly placed on dentin and that relocated with conventional flowable composite.
2- Margin adaptation of the ceramic restorations relocated with flowable and bulk fill flowable composite are comparable.
3- Cervical margin relocation doesn’t affect the microleakage of the ceramic restorations.
4- Haemostatic agent contamination affects both marginal adaptation and microleakage of the ceramic restorations.