The purpose of this study was to evaluate shear bond strength of glass ionomer
cements and compomer according to dentin surface treatment method. The materials
used in this study were dentin conditioner and cavity conditioner for dentin treatment:
Ketacfil, Fuji Ⅱ LC, and Dyract for restoration.
In this study, 90 sound bovine teeth were selected and then the teeth were embeded
in improved stone and were grounded with 400 to 600 grit silicon carbide paper to
create a flat dentin surfaces. The teeth were divided into nine groups as follows ;
Group 1A : Samples bonded to dentin surface with Ketacfil after no treatment.
Group 1B : Samples bonded to dentin surface with Ketacfil after applicating dentin
conditioner
Group 1C : Samples bonded to dentin surface with Ketacfil after applicating cavity
conditioner.
Group 2A : Samples bonded to dentin surface with Fuji Ⅱ LC after no treatment.
Group 2B : Samples bonded to dentin surface with Fuji Ⅱ LC after applicating dentin
conditioner.
Group 2C : Samples bonded to dentin surface with Fuji Ⅱ LC after applicating cavity
conditioner.
Group 3A : Samples bonded to dentin surface with Dyract after no treatment.
Group 3B : Samples bonded to dentin surface with Dyract after applicating dentin
conditioner.
Group 3C : Samples bonded to dentin surface with Dyract after applicating cavity
conditioner.
Treated dentin surfaces were observed under SEM. After filling of each materials,
shear bond strenth was evaluated and then debonded surfaces were observed under
SEM.
The following results were obtained ; 1. The shear bond strengths obtained were
decreased as Fuji Ⅱ LC, Dyract, Ketacfil in that order and there was statistically
significant difference(P<0.05).
2. About Group 1, the shear bond strengths were decreased as 1C, 1B and 1A in that
order. But there was no significant difference between group 1B and 1C (p<0.05).
3. About Group 2, the shear bond strengths were decreased as group 2B, 2A and 2C in
that order. And there was significant difference between group 2B and 2C (p<0.05).
4. About Group 3, the shear bond strengths were decreased as group 3A, 3C and 3B in
that order. And there was significant difference between group 3A and 3B (p<0.05).
5. As a result of observation under SEM, the fracture patterns of Fuji Ⅱ LC and
Dyract were adhesive failures, but those of Ketacfil were cohesive failure of material
and mixture of cohesive and adhesive failure
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