Interference o
Interference
of preventive caries system with microshear bond strength of enamel
surface bonded to etch &rinse or self etch adhesive system with
nanofilled composite
Ola. M. Sakr1 and
Mohammad Almohaimeed 2
1Departments of Operative Dentistry, College of
Dentistry ,Qassim University (Saudi Arabia) and Misr University for
Science and technology (Egypt)
2 Department of Orthodontics and Pediatric
Dentistry, College of Dentistry , Qassim University, Saudi Arabia
Abstract: Purpose: To evaluate the microshear bond strength of
self etch and etch &rinse adhesives of nanofilled
composite on enamel substrates after fluoride application. Materials
and Methods: Forty Enamel samples were obtained from human premolars
and randomly divided into 2 groups (n = 10) according to enamel substrates
treatment first group samples are painted with fluoride varnish for 20 min and
stored in artificial saliva for 24 hours , then divided into 2 subdivisions :
first subdivision is treated with etch & rinse adhesive then. 2nd subdivision
samples are treated with self etch adhesive. The second group divided into 2
subdivision : first subdivision are treated with etch & rinse adhesive. 2nd subdivision
samples are treated with self etch adhesive. All prepared samples ,Prior
to adhesive curing, a hollow cylinder (2.0 mm height/0.75mm internal diameter)
was placed on the treated surfaces. A nanofilled resin composite was then
inserted into the tube and cured. After artificial saliva storage for 24 hrs,
the tube was removed and microshear bond strength was determined in a universal
testing machine at a crosshead speed of 0.5 mm/min. Results: The
mean and standard deviation values of micro-shear bond strength were 15.9 ± 4
MPa and 9.7 ± 3.8 MPa for normal and fluoridated enamel, respectively. Normal
enamel showed statistically significantly higher mean micro-shear bond strength
than fluoridated enamel. Conclusions: The microshear bond
strength decrease in cases of recently fluoridatedenamel.
[Ola. M. Sakr and
Mohammed Almohaimeed. Interference of preventive caries system
with microshear bond strength of enamel surface bonded to etch
&rinse or self etch adhesive system with nanofilled composite.Life
Sci J 2013;10(1):1984-1987] (ISSN:1097-8135). http://www.lifesciencesite.com.
Key Words: preventive therapy, microshear bond strength, adhesion , nanofilled composite.
