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A new method to measure the linear polymerization shrinkage of composites using a particle tracking method with computer vision
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Basic Research A new method to measure the linear polymerization shrinkage of composites using a particle tracking method with computer vision
In-Bog Lee, Sun-Hong Min, Deog-Gyu Seo, Sun-Young Kim, Youngchul Kwon
Journal of Korean Academy of Conservative Dentistry 2010;35(3):180-187.
DOI: https://doi.org/10.5395/JKACD.2010.35.3.180
Published online: May 31, 2010

Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea.

Correspondence to: In-Bog Lee. Department of Conservative Dentistry & Dental Research Institute, School of Dentistry, Seoul National University 275-1 Yoengeon-Dong, Jongno-Gu, Seoul, 110-786, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr
• Received: April 22, 2010   • Revised: April 25, 2010   • Accepted: April 26, 2010

Copyright © 2010 Korean Academy of Conservative Dentistry

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  • Since the introduction of restorative dental composites, their physical properties have been significantly improved. However, polymerization shrinkage is still a major drawback. Many efforts have been made to develop a low shrinking composite, and silorane-based composites have recently been introduced into the market. In addition, many different methods have been developed to measure the polymerization shrinkage.
    In this study, we developed a new method to measure the linear polymerization shrinkage of composites without direct contact to a specimen using a particle tracking method with computer vision. The shrinkage kinetics of a commercial silorane-based composite (P90) and two conventional methacrylate-based composites (Z250 and Z350) were investigated and compared. The results were as follows:
    1. The linear shrinkage of composites was 0.33-1.41%. Shrinkage was lowest for the silorane-based (P90) composite, and highest for the flowable Z350 composite.

    2. The new instrument was able to measure the true linear shrinkage of composites in real time without sensitivity to the specimen preparation and geometry.

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Figure 1
Schematic diagram of computer vision system.
jkacd-35-180-g001.jpg
Figure 2
Specimen preparation for linear shrinkage measurement using computer vision.
jkacd-35-180-g002.jpg
Figure 3
A captured original image (left) and a binarized image (right) after filtering. The position of an object is determined by the area center method.
jkacd-35-180-g003.jpg
Figure 4
Algorithm to get the coordinate of an interesting particle from an image.
jkacd-35-180-g004.jpg
Figure 5
Linear shrinkage curves of composites as a function of time.
jkacd-35-180-g005.jpg
Figure 6
Linear shrinkage of composites at 10 min after curing.
jkacd-35-180-g006.jpg
Table 1
Composite resins used in this study.
jkacd-35-180-i001.jpg
Table 2
Linear polymerization shrinkage measured and calculated volume shrinkage of composites at 10 min.

Number in parenthesis is standard deviation.

Calculated volume shrinkage = 3× measured linear shrinkage.

jkacd-35-180-i002.jpg

Tables & Figures

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        A new method to measure the linear polymerization shrinkage of composites using a particle tracking method with computer vision
        J Korean Acad Conserv Dent. 2010;35(3):180-187.   Published online May 31, 2010
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      A new method to measure the linear polymerization shrinkage of composites using a particle tracking method with computer vision
      Image Image Image Image Image Image
      Figure 1 Schematic diagram of computer vision system.
      Figure 2 Specimen preparation for linear shrinkage measurement using computer vision.
      Figure 3 A captured original image (left) and a binarized image (right) after filtering. The position of an object is determined by the area center method.
      Figure 4 Algorithm to get the coordinate of an interesting particle from an image.
      Figure 5 Linear shrinkage curves of composites as a function of time.
      Figure 6 Linear shrinkage of composites at 10 min after curing.
      A new method to measure the linear polymerization shrinkage of composites using a particle tracking method with computer vision

      Composite resins used in this study.

      Linear polymerization shrinkage measured and calculated volume shrinkage of composites at 10 min.

      Number in parenthesis is standard deviation.

      Calculated volume shrinkage = 3× measured linear shrinkage.

      Table 1 Composite resins used in this study.

      Table 2 Linear polymerization shrinkage measured and calculated volume shrinkage of composites at 10 min.

      Number in parenthesis is standard deviation.

      Calculated volume shrinkage = 3× measured linear shrinkage.


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