Li Aijie, Chen Xinmin, Xu Zujie, Zhang Dongjiao
West China College of Stomatology, Sichuan University, Chengdu 610041, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2013 Feb;30(1):121-4, 130.
The purpose of this study was to investigate the three-dimensional displacement of the cantilever fixed partial denture (CFPD) under an oblique loading. One Beagle dog was used in this experiment. The CFPD, which used the second premolar and the first molar as abutments and the second molar as pontic, was made in vitro fresh mandible of the Beagle dog, and the digital laser speckle (DLS) technique was employed to measure the three-dimensional displacement of the CFPD under the oblique loading for the first time. We found that when an oblique loading was exerted on the pontic, the displacement of CFPD was the greatest, and the displacement of the abutment near the pontic was smaller than that of the pontic but greater than that of the abutment far from the pontic. We also found that when an oblique loading was exerted on the abutment, the displacement of the directly loaded abutment was greater than that of the other abutment and the pontic. Under the oblique loading, the displacement increased with increasing of load. The experiment demonstrated that it would be advisable for the clinicians to avoid oblique loading, especially the oblique loading of the pontic when using the CPDF. The DLS technique may be one kind of methods for measuring the three-dimensional displacements of the small and irregular objects.
本研究的目的是调查悬臂固定局部义齿（CFPD）在斜向加载下的三维位移。本实验使用了一只比格犬。以第二前磨牙和第一磨牙为基牙、第二磨牙为桥体制作的CFPD，在比格犬新鲜离体下颌骨上制作，首次采用数字激光散斑（DLS）技术测量CFPD在斜向加载下的三维位移。我们发现，当在桥体上施加斜向载荷时，CFPD的位移最大，靠近桥体的基牙位移小于桥体但大于远离桥体的基牙位移。我们还发现，当在基牙上施加斜向载荷时，直接加载的基牙位移大于另一基牙和桥体的位移。在斜向加载下，位移随载荷增加而增大。实验表明，临床医生在使用CPDF时应避免斜向加载，尤其是桥体的斜向加载。DLS技术可能是测量小而不规则物体三维位移的一种方法。
