الفهرس 
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Abstract
The present study was intended to evaluate the effect of diflèrent surface treatments on the transverse strength of the repaired heat-cured acrylic resin specimens.
Ninety acrylic resin specimens were constructed according to ADA Specitications No. 12 with dimensions 65, 10 and 2.5 mm for length, width and thickness respectively.
They were divided into three main groups : Group I (control group) of 10 intact specimens to measure the mean transverse strength of heat-cured acrylic resin.
Group I! and group 111, each of which was made of 40 divided acrylic resin specimens, prepared with round edge profile. The round edge profiles were sandblasted in group II.
According to the surface treatment, group 11 and HI were subdivided into four equal subgroups as follows; subgroup A: without chemical treatment, subgroup B : treated with chloroform, subgroup C: treated with monomer, and subgroup D: treated with etching & adhesive. Repair of all the fractured specimens was done by using self-cured acrylic resin. Then, the transverse strength of all specimens was measured by using Lloyd Testing Machine.
The results of this study showed that(1) There was a statistically significant difference between the sandblasted and non sandblasted repaired resin specimens with all the surface treatments except that with monomer.
(2) The highest transverse strength of the repaired resin specimens was observed in the sandblasted specimens treated with.