Analytical & Experimental Research of Rapid Dual Thread Screw Implant
Dr. Yhoda Carmeli & Amir Yardeni Mechanical engineer

Introduction

As the popularity of using implants in dental restorative procedure gains momentum, there is a need to find innovative dental implant, which can effectively transfer the loads and provide the necessary stabilization into jawbone.
This paper presents the development results of a novel implant with a Dual Thread Screw as shown in Fig.1.
This approach allows obtaining a high reinforcement of the implant in the jawbone by a reduction of the drilling bone volume along with an additional gain of primary surface contact relatively to classical implants.

To prove the concept, analytical models and xperiment tests were carried out during the development of an implant with Dual Thread Screw . The analytical calculations are based on Finite Element Model, while the experiment tests were done on an artificial bone made of Fiberglass and Structural foam, which represents the bone mechanical properties. These unique experimental tests which have been chosen, since the clinical tests evaluations on animals are not efficient. The animal has different dental jaw structure and it requires a lot of time to get the results.

Rapid Implant
dental implants

Dental Implant Description

The unique dental Implant, shown in Fig. 1, uses dual threads with conical core with five rings at the implant interface area with the cortical bone and dual thread thick groves at the cancellous. This unique design allows facilitating the transfer of occlusal forces to the
greatest surface area of the bone-implant interface for favorable load distribution. Also it reduces the amount of bone removed by using a novel drilling procedure.

Experimental Method

Force-displacement tests have been carried out on Classical Cylindrical Implant and implant both have diameter of 4.2 mm and 13 mm in length. The implants have been inserted in an artificial bone specimen shown in Fig. 2, the cross section dimensions of this specimen are of a typical mandible as is shown in Fig. 2. An axial load was applied onto the implant head until failure was reached. During the static tests the force-displacement curves were recorded and axial stiffness has been calculated.

Experimental Results

The experimental tests showed that the implant?could carry higher axial load compared to classical?cylinder implants, as shown in figure 4. It is also shown?that implant has higher stiffness then the classical?cylindrical implant. The stiffness of the implants is?compatible with measured axial stiffness of 180 Kg/mm?Analytical Method?Finite Element Model (FEM) of an implant installed in?a standard jawbone cross section has been built using?NASTRAN FEM software. The aim of this study was?to evaluate the influence of implant versus classical?cylindrical implants on the stress intensity and stress?distribution due to axial load. Two analytical models?were built for the identical specimen types described?above. The Implant stress distribution at the bone cross?section was calculated.
The FEM model of the dental implant bone system used?2-D Plate elements; the model is symmetrical since only?axial (vertical) load had been analyzed, as is shown in?Fig. 4.

.

Dental Implants Test

Analytical Results

The analytical calculations showed that the implant?have favorable stress distribution over the classical?cylindrical implant. The maximal shear stress level at the cortical jawbone?with implant is 15% to 25% lower compared with a?classical cylindrical implant, which plots the max shear?stress distribution in the cortical bone under an axial?load of 40 Kg for the both type of implants.

.

Discussion & Conclusions

The experimental tests showed that implant achieved?the highest vertical load capability compared with?a classical cylindrical implant. The unique tests?experiments method evaluates in this study provided?short development time by using artificial bone?specimen.
These experiments were done with a background of?analytical calculations. The lower shear stress values at?the cortical bone evaluate for the implant compared?with the classical cylindrical implants provides the?advantage of the implant regarding on carrying higher?loads and increasing life time of the implant. This?phenomenon is mostly due to the innovative implant?geometry and bone drilling method.

References

  • Lawrence B. Lum,A Biomechanical Rationale for the use?of Short Implants. Journal of Oral Implantology Vol.?XVII/ No. Tow/1991 pp126-131
  • Borchers L. Relchart P.“Three – dimensional stress distribution around a dental?implant at different stages of interface development”.
  • J. Dent Res 1983 62(2):156-159 Kitoh, M; Matsushita,?Y.; Yamautue, S; Ikedda, H.; and Suetsugu, T. The Stress?Distribution of Hydroxyapatite Implant Under Vertical?Load by the Two-Dimensional Finite Element Method.?Journal of Implantol 14:65-71 Dechow P.C. Naill
  • G.A. Schwartz-Dabney C.L. and Ashman R.B., “Elastic?properties of the human supraorbital and mandibular?bone”. Am J Phys Anthropol 90, pp 291-306. 1993.
dental implant surface
  • 洞见不闹革命的文化批评 2019-05-22
  • 候选企业:内蒙古高原杏仁露有限公司 2019-05-22
  • 瑞典民众庆祝世界杯胜利时发生枪击 致4人受伤 2019-05-22
  • 县名解析:朔州山阴县县名来历 2019-05-21
  • 各族群众乐享假日:粽叶飘香 歌舞传情 2019-05-21
  • 这家用户近2亿的手机厂商 如何布局人工智能丨产品家 2019-05-21
  • 【专题】全省“不作为、乱作为、慢作为”问题线索举报平台 2019-05-21
  • 惊艳卢浮宫小牛电动发布新款电动车惊艳卢浮宫小牛电动发布新款电动车-手机行情 2019-05-20
  • 上合组织引领发展 吉中合作稳步前行——访吉尔吉斯斯坦总统热恩别科夫 2019-05-20
  • 文代会作代会来啦:听听文艺名家的心里话 2019-05-20
  • 国内油价年内首次“六连跌” 每升再降1毛 2019-05-19
  • 介休绵山清明(寒食)文化旅游节盛大启幕 2019-05-19
  • 十九大精神在基层--宁夏频道--人民网 2019-05-19
  • 湖州德清东衡村:产村融合助振兴 2019-05-19
  • 【理上网来喜迎十九大】姚树洁:世界看好中国的未来 2019-05-18
  • 914| 400| 878| 605| 613| 828| 693| 910| 177| 696|