[The effect of simulate intraoral sandblasting on the band strength between enamel and composite resin].
OBJECTIVE
To study whether the bond strength between enamel and composite resin could be enhanced by intraoral sand abrasive.


METHODS
Ten human maxillary first incisior teeth were divided into 2 groups  The experimental group was sandblasted with 30 microm Al2O3 (CoJet-Sand, pressure 300 kPa) from a distance of 5 mm for 5 seconds, and the control group were not sandblasted. The Herculite composite resin composite cylinders were bonded with Coltene system. Bonded specimens were stored in 37 degrees C distilled water for 24 h, then were subjected to shear force in a testing machine. Stress at failure was calculated in Mpa, and mode of failure was recorded. The Student t test was applied to the data.


RESULTS
The shear bond strength of experimental groups was (33.0+/-1.8) MPa, and that of control groups was (26.7+/-5.2) MPa,there was significant difference between these two groups. All the adhesive failures happened at the enamel   composite resin interface, except that cohesive failure happened in one sandblasted specimen.


CONCLUSIONS
Intraoral sandblasting could significantly enhance the shear bond strength between enamel and composite resin.
Zhang
Han-ping
HP
Special Department, Peking University Stomatological Hospital, Beijing 100081, China. zhanghp79kq@sina.com
Wei
Yan
Y
Deng
Xu-liang
XL
Zheng
Gang
G
D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D006801:Humans; D013718:Tensile Strength
D003188:Composite Resins