臺灣博碩士論文加值系統

當今牙科治療中植牙的螺紋是一重要關鍵。本研究旨在：i- 確定螺紋的最佳設計；ii- 研究不同種植體螺紋模型對骨植入物 - 界面應力分佈的影響；iii- 研究靜態和其他植入行為。另一方面，利用數學建模評估皮質骨和種植體（PDL）界面中應力分佈的影響。
本研究主要利用機械設計開發新型的植入模型。其目標為藉由FEA達到優化設計。在第一部分中，考慮了五種具有不同螺紋輪廓設計的植入物，並且使用FEA評估了皮質骨和鬆質骨中的應力分佈模式。 尺寸符合牙科植入物的商業螺紋配置標準。對於界面 (inter-face)，PDL被設計為具有0.1mm厚度尺寸。3D CREO Parametric V5和ABAQUS V20主要使用於植入物以及界面3D建模。
有限元分析的結果表明，Von Mises中的應力在植入物和界面中變得更加近中。 最大應力集中在皮質骨上並轉移到植入物的第一個螺紋。 模擬顯示在鬆質骨處觀察到最小應力，在植入物處觀察到最大應力。 使用不同的螺紋設計和各種骨整合條件不會影響支撐骨中的應力分佈模式。 在界面中，應力沿著載荷方向分佈。

The choice of the thread structure of the implant plays a crucial role in the dental treatment. This study was undertaken to: i - Identify the optimum design of the thread, ii - Investigate the impacts of different implant thread models on bone implant-interface stress distribution, iii - Investigate Static and other behaviors of implants. On the Other hand, At the interface of the jawbone and roots of teeth, the effect of stress distribution in the interface of cortical bone and implant (PDL) is evaluated along with the numerical analysis.
A full mechanical system design for a dental implant model was developed within the range of the study. The design was optimized using the FEA depending on the design strategic objectives. In the First part, five implants with different thread profile designs considered and the pattern of the stress distribution in cortical bone and Cancellous bone are evaluated using FEA. The dimensions were in according with the commercial thread configuration standards for dental implant. For the Interface, PDL is designed as a third party which has 0.1mm thickness dimension. The 3D CREO Parametric V5 software was used for implants as well as interface 3D modeling and Simulated in ABAQUS V2018 FEA Software. Applied load for both cases has a magnitude of 150N at 30o Angulation.
The results from the FEA showed that the stress in Von Mises has become more mesiodistally both in the implants and in the Interface. Maximum stresses found concentrated at the cortical bone and transferred to the first thread of the implant. The Simulation shows that the least stresses were observed at the cancellous bone and maximum at the implant. The use of various thread designs and different conditions of osseointegration did not affect the patterns of stress distribution in the supporting bone. In the Interface the stresses are distributed in the direction of load is applied.

ABSTRACT iii
摘要 iv
ACKNOWLEDGEMENTS v
List of Table ix
List of Figure x
CHAPTER 1 1
1 INTRODUCTION 1
1.1 Dental Implants 1
1.2 Overdentures and dental Implants 2
1.2.1 Surface Properties: Osseointegration and Implant 5
1.3 Implant Materials 5
1.3.1 Ceramic 6
1.3.2 Metals 8
1.3.3 Polymers 9
1.4 Implant Geometries 9
1.4.1 Implant Shape 9
1.4.2 Implant Size 10
1.4.3 Thread Profile 10
CHAPTER 2 13
2 BACKGROUND 13
2.1 Optimum Implant Thread Selection among different types of implants 13
2.2 Implant bone interface biomechanics 14
2.2.1 Occlusal forces in Osseo integrated Implants 14

2.2.2 Implant Force Transmission to Bone 14
2.2.3 External loads and transmission of forces 16
2.3 PDL - Periodontal Ligament 17
2.3.1 Periodontal ligament mechanical behavior 18
2.3.2 PDL's mechanical behavior experimental studies 19
2.4 Finite Element Analysis in Dentistry 24
2.5 Objectives of the study 26
CHAPTER 3 27
3 Materials and Method 27
3.1 Selection of Implants 27
3.1.1 Dental Implant System Design 27
3.1.2 Implant Design 28
3.1.3 Abutment Design 37
3.1.4 Methods & FEM procedures 37
3.2 Material Properties 39
3.2.1 Contact Body Definitions and Mesh Generation 40
3.2.2 Loads and boundary conditions 40
3.2.3 Bite force application 41
3.2.4 Boundary Condition and Load Applied 41
3.3 Interface – Periodontal ligament 42
3.3.1 Mathematical Analysis 43
3.3.2 Interface – FEA 53



CHAPTER 4 57
4 RESULTS AND DISCUSSION 57
4.1 Implant Selection 57
4.2 Interface 71
CHAPTER 5 78
5 CONCLUSION 78
References 80
Glossary 87

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