The purpose of this study was to evaluate the shear bond strength of the Compoglass Carvifil bonded on the dentin surface according to etching or non-etching and two time application or three time application of single component.
Human non-carious 60 extracted 3rd molar were used. The occlusal dentin surfaces of all teeth were exposed with Diamond Wheel Saw and polished with Lapping & Polishing machine ( South Bay Technology Co., U.S.A).
The teeth were then distributed randomly into four groups of 15 teeth each and dentin surface were conditioned as following.
Control group : Non-etching, two times application of Syntac Single Component. (According to manufacture´s instruction)
Experimental group 1: Non-etching, three times application of Syntac Single Component.
Experimental group 2 :Etching, two times application of Syntac Single Component.
Experimental group 3 :Etching, three times application of Syntac Single Component.
Compoglass were bonded to exposed dentin surfaces and all samples were placed in distilled water for 7 days.
The shear bond strengths were measured by universal testing machine (SHIMADAZU AUTOGRAPH. AGS-4D., Japan).
The results were as follows :
1. Experimental group 3 revealed the highest vlaue (30.75±4.74 MPa) and control group revealed the lowest value (14.85±2.69 MPa). There was significant difference of shear bond strength among four groups (P<0.01)
2. The acid-etching groups (experimental group 2, 3) had higher shear bond strengths than non etching groups ( control group and experimental group 1).
3. The additional application of Syntac single component groups revealed a higher bond strength than two times application groups (control group and experimental. group 2).
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