Document Detail

Evaluation of the cylinder implant thread height and width: a 3-dimensional finite element analysis.
MedLine Citation:
PMID:  18416414     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To evaluate continuous and simultaneous variations of thread height and width for an experimental screw-type implant. MATERIALS AND METHODS: A finite element model of an implant with a V-shaped thread was created. The range of thread height was set at 0.20 to 0.60 mm, and the range of thread width was set at 0.10 to 0.40 mm. Forces of 100 N and 50 N were applied along the implant axis (AX) and an angle of 45 degrees in a buccolingual direction (45-degree BL), respectively. The maximum von Mises stresses in jawbone were evaluated, and the sensitivity of the stress in jawbone to the variables was also evaluated. RESULTS: Under AX load, the maximum von Mises stresses in cortical and cancellous bones increased by 4.3% and 63.0%, respectively, as thread parameters changed. Under 45-degree BL load, maximum von Mises stresses in cortical and cancellous bones increased by 19.3% and 118.0%, respectively. When thread height was from 0.34 to 0.50 mm and thread width was 0.18 to 0.30 mm, the tangent slope of the maximum von Mises stress response curve ranged from -1 to 1. The variation of the maximum von Mises stresses in jawbone was more sensitive to thread height than to thread width. CONCLUSIONS: Stress in cancellous bone is more likely to be influenced by thread parameters than stress in cortical bone. A 45-degree BL force is more likely to be influenced by thread parameters than an axial force. A thread height of 0.34 to 0.50 mm and a thread width of 0.18 to 0.30 mm is optimal from a biomechanical point of view. In the design of a screw-type implant, thread height is more important than thread width for the reduction of stress within the bone.
Liang Kong; Kaijin Hu; Dehua Li; Yingliang Song; Jin Yang; Ziyan Wu; Baolin Liu
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  The International journal of oral & maxillofacial implants     Volume:  23     ISSN:  0882-2786     ISO Abbreviation:  Int J Oral Maxillofac Implants     Publication Date:    2008 Jan-Feb
Date Detail:
Created Date:  2008-04-17     Completed Date:  2008-07-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8611905     Medline TA:  Int J Oral Maxillofac Implants     Country:  United States    
Other Details:
Languages:  eng     Pagination:  65-74     Citation Subset:  D; IM    
Department of Oral and Maxillofacial Surgery, School of Stomatology, Fourth Military Medical University, Xi'an, Shaanxi, China.
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MeSH Terms
Alveolar Process / physiology,  surgery
Bone Screws
Computer Simulation
Dental Implantation, Endosseous / methods*
Dental Implants*
Dental Prosthesis Design*
Dental Stress Analysis / methods*
Finite Element Analysis
Imaging, Three-Dimensional
Osseointegration* / physiology
Stress, Mechanical
Reg. No./Substance:
0/Dental Implants

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