Heat treatment effect on the fatigue fracture cycle of buccal multiloop

doi:10.3969/j.issn.2095-4344.2014.47.010

Abstract

Abstract:

BACKGROUND: Buccal Multiloop Removable Appliance can interceptively correct mutiple adolescent malocclusions. But the clinical problem of Buccal Multiloop fatigue fracture is not solved yet. How to prolong the fatigue fracture cycle is still in the research stage.
OBJECTIVE: To study the effect of different temperature of heat treatment on the Buccal Multiloop fatigue fracture cycle, thereby to select a relatively optimal method to enhance the fatigue fracture cycle.
METHODS: Thirty-five left HL-2 Buccal Mltiloops were divided into seven groups according to different ways of heat treatment. Each group consisted of five samples. They were an untreated group, three pre-bending groups (320, 420, 520 ℃ heat treatment before bending) and three post-bending groups (320, 420, 520 ℃ heat treatment after bending). The dental stainless steel wires and Buccal Multiloop were respectively treated by low-temperature annealing. The data were recorded and evaluated after the samples tested by the 3D Simulating Movement of TMJ Testing Machine. The features of fatigue fracture were observed by scanning electron microscope.
RESULTS AND CONCLUSION: The mean values of the Buccal Multiloop fatigue fracture cycle from largest to smallest were as follows: 520 ℃ pre-bending group > 420 ℃ pre-bending group > 320 ℃ pre-bending group > untreated group > 520 ℃ post-bending group > 320 ℃ post-bending group > 420 ℃ post-bending group. The fatigue fracture cycle of Buccal Multiloop made of the dental stainless steel wires after 520 ℃ annealing treatment was longer than others. By the observation of scanning electron microscope, the fracture crack extension area had the tendency to expand, transient interruption was delayed and the tissue structure became more uniform.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: orthodontic appliances, activator appliances

CLC Number:

R318

Bai Xue-fei, Wang Pei-jun, Xu Shi-qian, Hou Lu1, Liu Yu . Heat treatment effect on the fatigue fracture cycle of buccal multiloop[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(47): 7597-7602.

Figures/Tables 6

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