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The effect of adhesive property on microtensile bond strength to human dentin


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The effect of adhesive property on microtensile bond strength to human dentin

Article information

Restor Dent Endod. 2004;29(3):281-287
Publication date (electronic) : 2004 May 31
doi : https://doi.org/10.5395/JKACD.2004.29.3.281
Hyoun-Jin Kim, Bock Hur, Hyun-Cheol Kim
Department of Conservative Dentistry, College of Dentisty, Pusan National University, Korea.
Corresponding author: Bock Hur. Department of Conservative Dentistry, College of Dentisty, Pusan National University, 1-10 Ami-dong, Seo-gu, Pusan, 602-739, Korea. Tel: 82-51-240-7454, bhur@pusan.ac.kr

Abstract

The purposes of this study were to evaluate the effect of adhesive property on microtensile bond strength and to determine the failure mode.

Flat occlusal dentin surfaces were prepared using low-speed diamond saw. The dentin was etched with 37% phosphoric acid. The following adhesives were applied to the etched dentin to manufacturer's directions; Scotchbond Multi-Purpose in group SM, Prime&Bond NT in group NT, Scotchbond Multi-Purpose followed by Tetric-flow in group TR. After adhesive application, a cylinder of resin-based composite was built up on the occlusal surface. Each tooth was sectioned vertically to obtain the 1 × 1mm2 "sticks". Microtensile bond strength were determined. Each specimen was observed under stereomicroscope and scanning electron microscope (SEM) to examine the failure mode. Data were analyzed using one way ANOVA.

The results of this study were as follows;

1. The microtensile bond strength value were; group SM (18.98 ± 3.01MPa), group NT (16.01 ± 4.82MPa) and group TR (17.56 ± 3.22MPa). No significant statistical differences were observed among the groups (P>0.05).

2. Most of specimens showed mixed failure. In group TR, there was a higher number of specimens showing areas of cohesive failure in resin.

Keywords: Microtensile bond strength; Adhesive; Dentin; Stereomicroscope; Scaning eletron microscope; Failure mode

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Article information Continued

Copyright © 2004 Korean Academy of Conservative Dentistry
(open-access) :

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Figure 1

Figure 1

SEM photomicrograph of the resin/dentin interface produced by Scotchbond Multi-Purpose (×1000)

Figure 2

Figure 2

SEM photomicrograph of the resin/dentin interface produced by Prime&Bond NT (×500)

Figure 3

Figure 3

SEM photomicrograph of the resin/dentin interface produced by Scotchbond Multi-Purpose and Tetric-flow (×300)

Figure 4

Figure 4

SEM photomicrographs of fractured dentin side of specimens. Adhesive failure can be observed (×500)

Figure 5

Figure 5

SEM photomicrographs of fractured dentin side of specimens. Mixed failure can be observed (×1000)

Figure 6

Figure 6

SEM photomicrographs of fractured dentin side of specimens. Cohesive failure in resin can be observed (×1000)

Table 1

Materials

Table 1

Table 2

Bonding procedures

Table 2

Table 3

Microtensile bond strength(MTBS; Unit: MPa, Mean ± SD)

Table 3

Table 4

Failure mode

Table 4

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