الفهرس 
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Abstract
Although the re- paste the coronary Broken of incisors forward a proposal and is required in general, but there is no full agreement on the best way that might give strength and longevity of the part coronary re- patch , which managed to hide a line break for the aesthetics of the teeth.
There is also controversy about the materials that can be used to re- paste the the coronary broken parts .
* The objective of the study :
This study aims to assess the strength of re- paste the broken parts re- glued by three different types of preparation Sunni fracture surface and using two different types of adhesives , as well as to evaluate the aesthetics of these methods and their ability to hide the line breakage , as well as assess the pattern of failure at the site of fracture.
Has been used in this study, two hundred conclusive a subhuman overhead central permanently valid dislocated .
To measure the strength of re- pasting been putting all conclusive central hostile paste its coronary broken part individually on a fracture strength tests so that be destination for conclusive against the machine and be the fall of the cutting head of the machine on between Hafeo the line cutter breakage.
The bonding strength was calculated broken part by dividing the force needed to break every part mitral hostile to patch an area of the surface of the adhesive .
After that the surface has been tested Broken each conclusive centralized under a stereo microscope and scanning electron to determine the pattern of failure at the fracture site .
The results showed the power of re - adhesive Bana to descendants essential in re - adhesive force between the parts of the coronary re- glued using three different methods of in the Sunni preparation .
For aesthetic results has shown that the methods of re - adhesive without any preparation is the best way Sunni and followed by preparation method Sunni outer half - rounder .
As for the results of a scanning electron microscope and has shown that all the modes of failure at the fracture site was the failure of the adhesive resin and compound.
The pattern of failure more than a mixture groups animate preparation in the fracture surface .