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HOME > Restor Dent Endod > Volume 29(2); 2004 > Article
Original Article Influence of the curing time for the adhesive on the oxygen-inhibited layer thickness and the shear bond strength to dentin
Yong-Hoon Choi1, Ji-Hyun Bae1, Ho-Hyun Son1, In-Bog Lee1, Chung-Moon Um1, Seung-Ho Baek1, Oh-Young Kim2, Chang-Keun Kim3, Byeong-Hoon Cho1,
J Korean Acad Conserv Dent 2004;29(2):-184.
DOI: https://doi.org/10.5395/JKACD.2004.29.2.177
Published online: January 14, 2004

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Corresponding author: Byeong-Hoon Cho, Department of Conservative Dentistry, College of Dentistry, Seoul National University 28-2 Yeongun-dong, Chongro-gu, Seoul, Korea 110-749, Tel : 82-2-760-3514, 2651, Fax : 82-2-764-3514, E-mail : chobh@plaza.snu.ac.kr

Copyright © 2004 The Korean Academy of Conservative Dentistry

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.

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  • Objectives:
    This study investigated the hypothesis that increasing light-curing time would leave the oxygen-inhibited layer (OIL) of the adhesive thinner, and in turn, result in lower shear bond strength (SBS) than those obtained by the routine curing procedures.
  • Methods:
    120 human extracted posterior teeth were randomly divided into three groups for bonding with three adhesives: All Bond 2®, One Step®, and Adper Prompt®. They were subsequently divided into four subgourps with different light-curing time (10, 20, 30 and 60 s). The assigned adhesives were applied on superficial occlusal dentin according to the manufacturer’s instructions and cured with one of the four curing times. Composite resin cylinder, 2.35 mm in diameter, were built on the cured adhesive and light-cured for 40 s. SBS were measured after 24 h from the bonding using a universal testing machine (crosshead speed 1.0 mm/min). The relative thickness of the OIL and the degree of conversion (DC) were determined from the adhesive on a slide glass using FT-NIR in an absorbance mode. Data were analysed with One-way ANOVA and Duncan’s multiple test (p < 0.05).
  • Results:
    With increasing cure time, although there were no significant difference in th SBS of One-step and Adper Prompt (p > 0.05), those of All Bond 2 decreased significantly (p < 0.05). The relative thicknesses of the OIL on each adhesive were not affected by the cure time (p > 0.05). Although the DC of All-Bond 2 were statistically not different with increasing cure time (p > 0.05), those of One-Step and Adper Prompt showed an increasing trends with increasing cure time (p < 0.05).
  • Conclusions:
    Increasing light-curing time did not affect on the relative thickness of the OIL of the adhesives, and in turn, on the SBS to dentin.
  • Keywords: Oxygen inhibited layer; Shear bond strength; FT-NIR; Light curing time
Table 1.
Mean shear bond strength of three dentin adhesive systems with increasing cure time (Mean ± S.D., n = 10, unit: MPa).
10 sec 20 sec 30 sec 60 sec
All bond 2 26.44 ± 7.82a 30.73 ± 5.52a 17.81 ± 6.34b 17.63 ± 5.02b
One Step 20.46 ± 5.68a 17.06 ± 6.13a 15.26 ± 3.36a 18.39 ± 5.25a
Adper Prompt 15.96 ± 7.42a 21.04 ± 4.78b 22.62 ± 3.01b 18.85 ± 3.03b

* The same superscripts mean that they are not significantly different (One-way ANOVA, p < 0.05)

Table 2.
The difference between the % absorbance of the second spectra obtained after curing and that of the third spectra obtained after removing overlying uncured layer with alcohol sponge (% Absorbance; Mean ± S.D., n = 8)
10 sec 20 sec 30 sec 60 sec
All bond 2 0.0023 ± 0.00010a 0.0022 ± 0.0003a 0.0023 ± 0.0008a 0.0022 ± 0.0006a
One Step 0.0013 ± 0.0004a 0.0011 ± 0.0002a 0.0011 ± 0.0001a 0.001 ± 0.0001a
Adper Prompt 0.0017 ± 0.0004a 0.0015 ± 0.0004a 0.0018 ± 0.0002a 0.0016 ± 0.0003a

* The same superscripts mean that they are not significantly different (One-way ANOVA, p < 0.05)

Table 3.
The degree of conversion of the three adhesives after curing with increasing cure time (Mean ± S.D., n = 8, Unit: %)
10 sec 20 sec 30 sec 60 sec
All bond 2 40.05 ± 14.28a 42.78 ± 7.37a 47.28 ± 14.94a 42.63 ± 16.87a
One Step 57.42 ± 2.71a 65.54 ± 6.59b 63.18 ± 4.83b 67.08 ± 3.47b
Adper Prompt 19.69 ± 10.4a 26.81 ± 10.46a 32.23 ± 9.7a 40.65 ± 14.95b

*The same superscripts mean that they are not significantly different (One-way ANOVA, p < 0.05)

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        Influence of the curing time for the adhesive on the oxygen-inhibited layer thickness and the shear bond strength to dentin
        J Korean Acad Conserv Dent. 2004;29(2):177-184.   Published online January 14, 2004
        DOI: https://doi.org/10.5395/JKACD.2004.29.2.177
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      Influence of the curing time for the adhesive on the oxygen-inhibited layer thickness and the shear bond strength to dentin
      Influence of the curing time for the adhesive on the oxygen-inhibited layer thickness and the shear bond strength to dentin
      10 sec 20 sec 30 sec 60 sec
      All bond 2 26.44 ± 7.82a 30.73 ± 5.52a 17.81 ± 6.34b 17.63 ± 5.02b
      One Step 20.46 ± 5.68a 17.06 ± 6.13a 15.26 ± 3.36a 18.39 ± 5.25a
      Adper Prompt 15.96 ± 7.42a 21.04 ± 4.78b 22.62 ± 3.01b 18.85 ± 3.03b
      10 sec 20 sec 30 sec 60 sec
      All bond 2 0.0023 ± 0.00010a 0.0022 ± 0.0003a 0.0023 ± 0.0008a 0.0022 ± 0.0006a
      One Step 0.0013 ± 0.0004a 0.0011 ± 0.0002a 0.0011 ± 0.0001a 0.001 ± 0.0001a
      Adper Prompt 0.0017 ± 0.0004a 0.0015 ± 0.0004a 0.0018 ± 0.0002a 0.0016 ± 0.0003a
      10 sec 20 sec 30 sec 60 sec
      All bond 2 40.05 ± 14.28a 42.78 ± 7.37a 47.28 ± 14.94a 42.63 ± 16.87a
      One Step 57.42 ± 2.71a 65.54 ± 6.59b 63.18 ± 4.83b 67.08 ± 3.47b
      Adper Prompt 19.69 ± 10.4a 26.81 ± 10.46a 32.23 ± 9.7a 40.65 ± 14.95b
      Table 1. Mean shear bond strength of three dentin adhesive systems with increasing cure time (Mean ± S.D., n = 10, unit: MPa).

      * The same superscripts mean that they are not significantly different (One-way ANOVA, p < 0.05)

      Table 2. The difference between the % absorbance of the second spectra obtained after curing and that of the third spectra obtained after removing overlying uncured layer with alcohol sponge (% Absorbance; Mean ± S.D., n = 8)

      * The same superscripts mean that they are not significantly different (One-way ANOVA, p < 0.05)

      Table 3. The degree of conversion of the three adhesives after curing with increasing cure time (Mean ± S.D., n = 8, Unit: %)

      The same superscripts mean that they are not significantly different (One-way ANOVA, p < 0.05)

      Table 1.

      Table 2.

      Table 3.

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