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Journal of Zhejiang University SCIENCE B 2007 Vol.8 No.6 P.416-421

http://doi.org/10.1631/jzus.2007.B0416


Stabilization of an abutment under a rigidly fixed bridge by holographical-speckle interferometry


Author(s):  ZHANG Yan-zhen, ZHOU Yan-chun, LIU Li, LU Yang, HIROFUMI Yatani

Affiliation(s):  Department of Stomatology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China; more

Corresponding email(s):   zyz85@hotmail.com, double_zh@yeah.net

Key Words:  Rigidly fixed bridge, Tip angle, Maximum rotation angle, Laser holographical-speckle interferometry


ZHANG Yan-zhen, ZHOU Yan-chun, LIU Li, LU Yang, HIROFUMI Yatani. Stabilization of an abutment under a rigidly fixed bridge by holographical-speckle interferometry[J]. Journal of Zhejiang University Science B, 2007, 8(6): 416-421.

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author="ZHANG Yan-zhen, ZHOU Yan-chun, LIU Li, LU Yang, HIROFUMI Yatani",
journal="Journal of Zhejiang University Science B",
volume="8",
number="6",
pages="416-421",
year="2007",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2007.B0416"
}

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%T Stabilization of an abutment under a rigidly fixed bridge by holographical-speckle interferometry
%A ZHANG Yan-zhen
%A ZHOU Yan-chun
%A LIU Li
%A LU Yang
%A HIROFUMI Yatani
%J Journal of Zhejiang University SCIENCE B
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%P 416-421
%@ 1673-1581
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.B0416

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T1 - Stabilization of an abutment under a rigidly fixed bridge by holographical-speckle interferometry
A1 - ZHANG Yan-zhen
A1 - ZHOU Yan-chun
A1 - LIU Li
A1 - LU Yang
A1 - HIROFUMI Yatani
J0 - Journal of Zhejiang University Science B
VL - 8
IS - 6
SP - 416
EP - 421
%@ 1673-1581
Y1 - 2007
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2007.B0416


Abstract: 
Objective: There are no detailed reports of three-dimensional measurement of abutment teeth in mastication, because it is knotty to observe the rotation in chewing directly, and inexact to estimate indirectly. This work studies the three-dimensional stability of rigidly fixed bridge under the stresses of distributed loads and concentrated loads by optical method that gives the tip angle and rotation angle calculated directly based on measurement data. Methods: The specimen, taken from a 25-year-old male, was a left mandible without the second premolars and the first molars. As abutments, first premolar and second molar have complete periodontium. The specimen was soaked in formaldehyde solution. The bridge was fixed between two abutment teeth (first premolars and second molars), and the mandible was cemented in a steel box. The load was increased from 0 kg to 23 kg. Laser holographic technique was used to measure the three-dimensional bit shift of the dens, both buccolingual bit shift and mesiodistal bit shift, and determine tip angle and rotation angle. Results: The effects of stress distribution on the rigidly fixed bridge were evaluated, and stabilization of the bridge under the stresses of distributed loads and concentrated loads, respectively, were analyzed. The results showed that the tips of two abutments were very similar, and no distinct difference was observed between the distributed load and the concentrated load. However, the maximum rotation angle for the distributed load was two to four times as large as that for the concentrated load. In the experiment, the tip angle of the abutment teeth was no more than 0.65 degree, and the rotation angle was no more than 0.60 degree. All maximum angles occurred in the second molar. Conclusion: The fixed bridge is considered to be safe. In addition, a method for measuring the rotation angle was provided effectively.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[7] Liu, D.X., Wang, C.L., Zhang, X.Y., Zheng, X.Z., 2004. FEM study on displacement, position of rotation center and distribution of PDL under various loading force systems. West China J. Stomatol., 22(3):192-195 (in Chinese).

[8] Young, J.M., Altschuler, B.R., 1977. Laser holography in dentistry. The Journal of Prosthetic Dentistry, 38(2):216-220.

[9] Zhu, X.T., Bai, X., Zhou, X.G., 1985. Laser holographic analysis on force distribution of rigid and nonrigid fixed bridges. Chin. J. Biomed. Eng., 4(1):58-62 (in Chinese).

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