الفهرس 
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Abstract
This study was carried out to evaluate the tensile repair bond
strength of immediate repair of self cured RMGI with different surface
conditions and time lapsed.
Ten whole hourglass slabs, to serve as a control, and 80 half-slabs
from RMGI were made in an especially designed split copper mold. After
different time lapsed, the half-slabs from each type of RMGI were
divided into eight groups according to the repair protocol and time
lapsed. Fresh mix of RMGI was used for the repair of RMGI in this
study. Repair tensile bond strength was evaluated using a universal
testing machine at crosshead speed 0.5mm/min. Data was collected and
analyzed using SPSS version 17.0. Fractured surfaces were examined
using digital-microscope at X50 magnification.
The results showed that the different surface treatment of RMGI,
the time lapsed, and their interactions had a statistically significant effect
on the tensile repair bond strength.
Under the limitations of this study, several conclusions can be drawn:
1- Time factor seems to be an important factor for tensile bond
strength of the RMGI.
2- The surface treatment of RMGI directly affects the tensile bond
strength.
3- Immediate mechanical interference with RMGI; grinding
decrease the tensile bond strength.