Evaluation of shear bond strength of composite to newly condensed and set amalgam by using two adhesive systems.

AL Rawi B.D.S.M.Sc, Inas; Hammed B.D.S.M.Sc, Ahmmed

	Evaluation of shear bond strength of composite to newly condensed and set amalgam by using two adhesive systems.
MUSTANSIRIA DENTAL JOURNAL
Article 1, Volume 2, Issue 1, 2005, Pages 130-137
Authors
Inas AL Rawi B.D.S.M.Sc; Ahmmed hammed B.D.S.M.Sc
Abstract
The introduction of adhesives has created a new opportunity to bond composite resin to existing amalgam restoration on aesthetically disturbing surfaces. Further more , the composite laminate would probably improve the restoration . This in vitro study was conducted to evaluate the shear bond strength of composite resin to fresh and set amalgam by the use of two adhesive systems and to study the effect of water storage time on the shear bond strength of composite resin to fresh and set amalgam One hundred and eighty cylindrical specimens, 5mm high x 5 mm in diameter , composed of 3 mm of amalgam and 2 mm of composite with a layer of bonding material in between were prepared. Syntac Sc, Excite, control (non bonding) used to bond composite resin (Tetric) to the amalgam bases in three groups I, Il and lll (each one composed of 60 amalgam bases). Each group divided into two minor groups each of 30 amalgam bases one for fresh amalgam bases referred (F) and the other one for set amalgam bases referred (S), each minor group, F and S subdivided into 3 subgroups according to water immersion period into 48hrs, lmonth, 3months,stored at 37 C for scheduled period of time . Specimens were therrnocycled and subjected to shear bond strength testing, and the mode of failure whether adhesive, mixed cohesive were recorded also. Results expressed very highly statistically significant difference in shear bond strength values among the all three groups with the highest shear bond strength mean values (SBS) for the control group Ill (without bonding agent) with the greatest SBS values to set amalgam subgroups. While for group. I and II (Syntac SC, Excite) showed the highest SBS mean values to fresh amalgam .The Syntac SC bonding agent shows higher SBS mean than excite bonding agent to either fresh or set amalgam. In conclusion, for both types of bonding agents, Syntac SC performed better in bonding composite resin to amalgam than Excite and the water immersion period has an effect on the SBS mean values and on the type of mode of failure
Keywords
shear bond strength adhesive systems; composite set amalgam

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