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HOME > Restor Dent Endod > Volume 30(2); 2005 > Article
Original Article Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time
Soo-Kyung Cho, Dong-Jun Kim, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang
2005;30(2):-137.
DOI: https://doi.org/10.5395/JKACD.2005.30.2.128
Published online: March 31, 2005

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Corresponding author: In-Nam Hwang. Department of Conservative Dentistry, College of Dentistry, Chonnam National University, 8 Hak-dong, Dong-gu, Gwangju, Korea, 501-757. Tel: 82-62-220-4443, Fax: 82-62-225-8387, hinso@jnu.ac.kr
• Received: September 6, 2004   • Revised: November 18, 2004   • Accepted: November 23, 2004

Copyright © 2005 Korean Academy of Conservative Dentistry

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  • In this study we measured the amount of light energy that was projected through the tooth material and analyzed the degree of polymerization by measuring the surface hardness of composites. For polymerization, Optilux 501 (Demetron, USA) with two types of light guide was used: a 12 mm diameter light guide with 840 mW/cm2 light intensity and a 7 mm diameter turbo light guide with 1100 mW/cm2.
    Specimens were divided into three groups according to thickness of penetrating tooth (1 mm, 2 mm, 0 mm). Each group was further divided into four subgroups according to type of light guide and curing time (20 seconds, 40 seconds). Vickers'hardness was measured by using a microhardness tester. In 0 mm and 1 mm penetrating tooth group, which were polymerized by a turbo light guide for 40 seconds, showed the highest hardness values. The specimens from 2 mm penetrating tooth group, which were polymerized for 20 seconds, demonstrated the lowest hardness regardless of the types of light guides (p < 0.05).
    The results of this study suggest that, when projecting tooth material over a specified thickness, the increase of polymerization will be limited even if light intensity or curing time is increased.
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Figure 1
Schematic drawing of specimen fabrication.
jkacd-30-128-g001.jpg
Figure 2
Vickers' hardness number of all specimens.
jkacd-30-128-g002.jpg
Figure 3
Vickers' hardness of resin composites cured by Turbo-light guide.
jkacd-30-128-g003.jpg
Figure 4
Vickers' hardness of resin composites cured by 12 mm diameter light guide.
jkacd-30-128-g004.jpg
Figure 5
Ratio of Vickers' hardness by thickness of tooth structure.
jkacd-30-128-g005.jpg
Table 1
Groups were divided according to the thickness of tooth specimen, used light guide, curing time.
jkacd-30-128-i001.jpg
Table 2
Vickers' hardness of the tested resin composites
jkacd-30-128-i002.jpg

Tables & Figures

REFERENCES

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      Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time
      J Korean Acad Conserv Dent. 2005;30(2):128-137.   Published online March 31, 2005
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    Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time
    Image Image Image Image Image
    Figure 1 Schematic drawing of specimen fabrication.
    Figure 2 Vickers' hardness number of all specimens.
    Figure 3 Vickers' hardness of resin composites cured by Turbo-light guide.
    Figure 4 Vickers' hardness of resin composites cured by 12 mm diameter light guide.
    Figure 5 Ratio of Vickers' hardness by thickness of tooth structure.
    Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time

    Groups were divided according to the thickness of tooth specimen, used light guide, curing time.

    Vickers' hardness of the tested resin composites

    Table 1 Groups were divided according to the thickness of tooth specimen, used light guide, curing time.

    Table 2 Vickers' hardness of the tested resin composites


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