The effect of hybrid layer thickness on microtensile bond strength of three-step and self-etching dentin adhesive systems

Hye-Jung Lee; Jeong-Kil Park; Bock Hur

doi:10.5395/JKACD.2003.28.6.491

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Original Article The effect of hybrid layer thickness on microtensile bond strength of three-step and self-etching dentin adhesive systems: Hye-Jung Lee, Jeong-Kil Park, Bock Hur; Journal of Korean Academy of Conservative Dentistry 2003;28(6):491-497.
DOI: https://doi.org/10.5395/JKACD.2003.28.6.491
Published online: November 30, 2003

Department of Conservative dentistry, College of Dentistry, Pusan National University, Korea.

Corresponding author (momosori@freechal.com)

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Abstract
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Abstract

The purpose of this study was to evaluate the correlation between hybrid layer thickness and bond strength using confocal laser scanning microscope and microtensile bond strength test of two adhesive systems.

The dentin surface of human molars, sectioned to remove the enamel from the occlusal surface. Either Scotchbond Multi-Purpose(3M Dental Product, St. Paul, MN, U.S.A) or Clearfil SE Bond(Kuraray, Osaka, Japan) was bonded to the surface, and covered with resin-composite. The resin-bonded teeth were serially sliced perpendicular to the adhesive interface to measure the hybrid layer thickness by confocal laser scanning microscope. The specimen were trimmed to give a bonded cross-sectional surface area of 1mm², then the micro-tensile bone test was performed at a crosshead speed of 1.0 mm/min. All fractured surfaces were also observed by stereomicroscope.

There was no significant differences in bond strengths the materials(p>0.05). However, the hybrid layers of three-step dentin adhesive system, SM, had significantly thicker than self-etching adhesive system, CS(p<0.05). Pearson's correlation coefficient showed no correlation between hybrid layer thickness and bond strengths(p>0.05). Bond strengths of dentin adhesive systems were not dependent on the thickness of hybrid layer.
Keywords: Hybrid layer thickness; Microtensile bond strength; Confocal laser scanning microscope

REFERENCES

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Fig. 1

Scotchbond Multi-Purpose (3M)

A; Adhesive layer(rhodamine)

B; Primer layer(fluorescene)

C; Adhesive layer+Primer layer

Fig. 2

Clearfil SE Bond (Kuraray)

A; Adhesive layer(rhodamine)

B; Primer layer(fluorescene)

C; Adhesive layer+Primer layer

Table 1

Dentin bonding system used in this study

Table 2

Thickness of hybrid layer(THL) and microtensile bond strength(MTBS)

Table 3

Failure mode

type A : adhesive failure between bonding resin and dentin

type B : mixed failure (above 50% adhesive failure)

type C : mixed failure (below 50% adhesive failure)

type D : cohesive failure in resin

type E : cohesive failure in dentin

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The effect of hybrid layer thickness on microtensile bond strength of three-step and self-etching dentin adhesive systems

J Korean Acad Conserv Dent. 2003;28(6):491-497. Published online November 30, 2003

DOI: https://doi.org/10.5395/JKACD.2003.28.6.491

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The effect of hybrid layer thickness on microtensile bond strength of three-step and self-etching dentin adhesive systems

Fig. 1 Scotchbond Multi-Purpose (3M) A; Adhesive layer(rhodamine) B; Primer layer(fluorescene) C; Adhesive layer+Primer layer

Fig. 2 Clearfil SE Bond (Kuraray) A; Adhesive layer(rhodamine) B; Primer layer(fluorescene) C; Adhesive layer+Primer layer

Fig. 1

Fig. 2

The effect of hybrid layer thickness on microtensile bond strength of three-step and self-etching dentin adhesive systems

Table 1

Dentin bonding system used in this study

Table 2

Thickness of hybrid layer(THL) and microtensile bond strength(MTBS)

Table 3

Failure mode

type A : adhesive failure between bonding resin and dentin

type B : mixed failure (above 50% adhesive failure)

type C : mixed failure (below 50% adhesive failure)

type D : cohesive failure in resin

type E : cohesive failure in dentin

Table 1 Dentin bonding system used in this study

Table 2 Thickness of hybrid layer(THL) and microtensile bond strength(MTBS)

Table 3 Failure mode

type A : adhesive failure between bonding resin and dentin

type B : mixed failure (above 50% adhesive failure)

type C : mixed failure (below 50% adhesive failure)

type D : cohesive failure in resin

type E : cohesive failure in dentin