الفهرس 
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Abstract
The work done in this study was divided into two main parts:1 Evaluation of water sorption, water solubility, and dimensional changes of autopolymerizing conventional, autopolymerizing microfilled, and visible light microfilled composite resins I.Evaluation of tne sealing ability of these composites Evaluation of water sorption, water solubility and dimensionalchang 15 samples of each composite type were prepared. Ten samples of each composite type used, were considered as the working group and the remaining five samples were considered the control group.water sorption, water solubility, and dimensional changes ;ercents of each composite type were calculated through the afferentiation between the initial and final weights of each rking and control sample after six months water immersion rii/or incubation.it was found that, the larger particle composite resin :nventional type) exhibited less sorption and dimensional changes than those of the two types of microfilled composite -sins. Also, the autopolymerizing microfilled composite sin showed more sorption and dimensional changes percents those of the visible light activated composite resin r solubility percents of composites showed much less s than those of water sorption percents.
No significant difference was found between the value of water solubility
The phenomenon of leakage through dental fillings inside the are of the dangers facing the dental profession .
They just do not affect the validity of the charges , but affect the vital pulp Age .
This phenomenon has drawn the attention of many researchers They Daúbon to search for ways and means to prevent the occurrence.
* The purpose of the research :
1. Measuring some physical properties of three kinds of stuffing Alkambozi the after age in water , such as:
- The percentage of the weight of the water absorbed .
- The percentage of the weight of the substance dissolved in the water .
- The percentage change in the dimensions.
2. Find a relationship between the physical properties .
3. Study resealed to those of filler material Alkambozi on pit toothache .
* Materials and methods used in the research :
- Materials used:
I have used in this research three different materials of stuffing Alkambozi which :
1. Kambozi is inaccurate particles and has a chemical reaction .
2. Kambozi with minute particles and chemical Zotfaal .
3. Kambozi with minute particles and of light interaction .
As well as sour الخادش and exterior paint for each type.
The ratio was calculated Almaah water uptake and weight Alkambozi dissolved in water by the difference between the initial weights and final weights of the samples was calculated the percentage of change in the dimensions through dimensional difference between the preliminary and the final dimensions of the samples.
* Results :
1. Water absorption to Kambozi accurate particulars more of them Kambozi the flour particles .
2. Water solubility ratio for all kinds of Alkambozi not differ from one significant difference .
3. Percentage change in the dimensional particles to Kambozi accurate for many of them to Kambozi inaccurate particulars .
4. I found a positive linear relationship between the significant water absorption and change in the dimensional all kinds Alkambozi .