الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
A total of 60 resin modified glass ionomer specimens were prepared and classified into two groups (30 specimens each) according to type of glass ionomer used. (A1: Fuji II& A2: Vitremer) Each of the above two groups were further subdivided into three subgroups (10 specimens each) according to type of rotary instrument used to manage its surface.
B0: no rotary surface instrumentation (control)
B1: surface was instrumented using carbide fissure bur.
B2: surface was instrumented using diamond abrasive stone.
All specimens were bonded to low shrinkage resin composite and then tested for shear bond strength. . Shear bond strength tests were performed via a computer controlled testing machine (Model LRX-plus; Lloyd Instruments Ltd., Fareham, UK) with a load cell of 5kN. Data were recorded using computer software (Nexygen-MT; Lloyd Instruments) at a crosshead speed of 0.5 mm/min in tension until failure.The results showed that there was no significant difference between the two glass ionomers utilized as regards to their bond strength to composite resin regardless of the type of surface treatment. While there was a significant affect for surface treatment of glass ionomer compared to the control and there was a significant difference between the two types of surface treatments.
group A1B1 (Fuji II with carbide fissure bur) recorded the highest statistically significant shear bond strength mean value (31.84MPa) of all six groups, followed by group A2B2(Vitremer with diamond abrasive stone) which recorded (29.49MPa), there was no statistically significant difference between the first and second group .
Followed by the remaining groups A2B1(Vitremer with carbide fissure bur) which recorded (22.51MPa).
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A1B2 (Fuji II with diamond abrasive stone) which recorded (21.54MPa), A1B0 (Fuji II control) which recorded (19.92MPa) and finally A2B0 (Vitremer control) which recorded (19.22MPa). There was no significant difference between the last four groups as regards their bond strength to composite resin. The previous results indicated that surface treatment of glass ionomer increased its shear bond strength to composite resin.
Conclusions:
Based on the results of this study and with respect to the materials and methods utilized, the following conclusions were drawn:
1. The type of Glass Ionomer Cement has no effect on shear bond strength to composite resin when its surface was non-instrumented.
2. Surface management of resin modified glass ionomer affects its bond strength to composite resin.
3. Surface roughening of resin modified glass ionomer with either carbide bur or diamond abrasive stone improves its bond strength to composite resin.
4. The effect of instrument type on GlassIonomer/Composite bond strength is variable according to glass ionomer type