الفهرس 
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Abstract
This study was planned to examine the influence of surface treatment
protocol on the composite-composite shear bond strength. In doing so, a suitable
protocol could be recommended for boosting the repaired bond strength of
Silorane based composite resin restoration.
A total of 35 Silorane based composite resin samples were prepared to
conduct this research. They were prepared in a teflon mold of 6 mm diameter
and 2 mm height. The substrate resin composite was light cured for 20 seconds
according to the manufacturers’ instructions. The prepared samples were then
kept for a 24 hour time lapse in distilled water, then were divided into 2 main
groups; one control group with no surface treatment. The second group was
further divided into 3 subgroups according to the surface treatment technique. In
the first group acid etching with 37% phosphoric was done, second gro up a
diamond coated wheel stone was used. Whereas in the third group, sand blasting
with AI2O3
powder was carried.
After doing surface treatment techniques, Silorane bond was painted over
the treated surface with a micro-brush and lightly air sprayed to assure having fine
layer of the bonding agent. Curing of the bonding agent according to the
manufacturer instructions was done for 20 seconds. Filtek ‘Silorane was packed
over the intermediate adhesive in the prefabricated split teflon mold of 6mm
diameter and 4mm depth.
All samples were kept in distilled water for 24 hours then thermocycled for
500 cycles at 5±2/55±2°C with a dwell time of 30 seconds and a transfer time of
10 seconds. Shear bond strength test was done using a universal testing machine at
a cross head speed of 0.5 mm/min.
The data were gathered and statistically analyzed using two way analysis of
variance (ANOVA) for studying the influence of surface treatments and their
interaction on mean shear bond strength with aging. The results reveale d that both
surface treatment had a highly significant influence on the shear bond strength.
Sand blasting groups showed the statistically significant highest mean shear bond
strength (37.18 MPa). This was followed closely by diamond coated stone
(36.55MPa). However, groups of incremental control and etching showed the
statistically non-significant lowest mean shear bond strengths (22.83 and 27.74
respectively).