Finite element analysis of stress distribution around a short implant according to a horizontally reduced bone in the mandible

( Kyeong-ok Lim ),( Kyung-min Kim ),( Min-cheol Yang ),( Hee-jung Kim ),( Won-pyo Lee ),( Byung-ock Kim ) 조선대학교 치의학연구원(구 조선대학교 구강생물학연구소) 2021 Oral Biology Research (Oral Biol Res) Vol.45 No.1

This study evaluates the stress distribution around a short implant supporting a bone with various horizontally reduced levels using a three-dimensional finite element stress analysis. A three-dimensional finite element model was designed by placing a short implant in a jaw model with a 2-mm-thick cortical bone. Horizontal bone loss was employed at 1-mm intervals from 0 to 3 mm, and a 400- N load was applied to the central fossa in a 0° vertical direction and 30° inward-inclined direction to the implant axis. Furthermore, the maximum principal stress generated in the short implant supporting the bone was calculated using a three-dimensional finite element stress analysis. As a result of the finite element analysis, the maximum principal stresses in a 0° vertical direction according to horizontal bone loss from 1 mm to 3 mm in the cortical bone were 45.13, 79.44, and 75.53 (MPa), respectively, and in the cancellous bone were 7.63, 9.28, and 9.60 (MPa), respectively. The maximum principal stresses in a 30° inward-inclined direction according to horizontal bone loss from 1 mm to 3 mm in the cortical bone were 132.34, 172.07, and 216.26 (MPa), respectively, and in the cancellous bone were 16.34, 27.43, and 26.37 (MPa), respectively. Within the limitations of this study, the authors concluded that the bone stress values tended to be higher around the implant neck under a 30° inward load and in the cortical bone according to the horizontally reduced bone level.

3차원 유한요소법을 이용한 치근형 임프란트 ”Protect-447 의 응력분석

김태인,김형진,이진희,이명재 대한치과이식임플란트학회 2001 The Korean Academy of Implant Dentistry Vol.20 No.1

A stress analysis of Protect-447 dental implant is carried out using three dimensional finite element analysis. Three different shape of dental implants have been compared to give an optimal stress distribution to the surrounding bone under the vertical force only and vertical with lateral forces. The maximum stress analysis of three types of dental implant showed that tapered implant Protect-447 has the best properties in terms of stress distribution and maximum stress level among the three implant types. The results of this study also showed that lateral force is one of the crucial factors that is responsible for the excessive stress in the mandible-implant system.

Biomechanical three-dimensional finite element analysis of monolithic zirconia crown with different cement type

Seung-Ryong Ha 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.6

PURPOSE. The objective of this study was to evaluate the influence of various cement types on the stress distribution in monolithic zirconia crowns under maximum bite force using the finite element analysis. MATERIALS AND METHODS. The models of the prepared #46 crown (deep chamfer margin) were scanned and solid models composed of the monolithic zirconia crown, cement layer, and prepared tooth were produced using the computer-aided design technology and were subsequently translated into 3-dimensional finite element models. Four models were prepared according to different cement types (zinc phosphate, polycarboxylate, glass ionomer, and resin). A load of 700 N was applied vertically on the crowns (8 loading points). Maximum principal stress was determined. RESULTS. Zinc phosphate cement had a greater stress concentration in the cement layer, while polycarboxylate cement had a greater stress concentration on the distal surface of the monolithic zirconia crown and abutment tooth. Resin cement and glass ionomer cement showed similar patterns, but resin cement showed a lower stress distribution on the lingual and mesial surface of the cement layer. CONCLUSION. The test results indicate that the use of different luting agents that have various elastic moduli has an impact on the stress distribution of the monolithic zirconia crowns, cement layers, and abutment tooth. Resin cement is recommended for the luting agent of the monolithic zirconia crowns.

Biomechanical three-dimensional finite element analysis of monolithic zirconia crown with different cement type

Ha, Seung-Ryong The Korean Academy of Prosthodonitics 2015 The Journal of Advanced Prosthodontics Vol.7 No.6

PURPOSE. The objective of this study was to evaluate the influence of various cement types on the stress distribution in monolithic zirconia crowns under maximum bite force using the finite element analysis. MATERIALS AND METHODS. The models of the prepared #46 crown (deep chamfer margin) were scanned and solid models composed of the monolithic zirconia crown, cement layer, and prepared tooth were produced using the computer-aided design technology and were subsequently translated into 3-dimensional finite element models. Four models were prepared according to different cement types (zinc phosphate, polycarboxylate, glass ionomer, and resin). A load of 700 N was applied vertically on the crowns (8 loading points). Maximum principal stress was determined. RESULTS. Zinc phosphate cement had a greater stress concentration in the cement layer, while polycarboxylate cement had a greater stress concentration on the distal surface of the monolithic zirconia crown and abutment tooth. Resin cement and glass ionomer cement showed similar patterns, but resin cement showed a lower stress distribution on the lingual and mesial surface of the cement layer. CONCLUSION. The test results indicate that the use of different luting agents that have various elastic moduli has an impact on the stress distribution of the monolithic zirconia crowns, cement layers, and abutment tooth. Resin cement is recommended for the luting agent of the monolithic zirconia crowns.

Biomechanical three-dimensional finite element analysis of monolithic zirconia crown with different cement type

하승룡 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.6

PURPOSE. The objective of this study was to evaluate the influence of various cement types on the stress distribution in monolithic zirconia crowns under maximum bite force using the finite element analysis. MATERIALS AND METHODS. The models of the prepared #46 crown (deep chamfer margin) were scanned and solid models composed of the monolithic zirconia crown, cement layer, and prepared tooth were produced using the computer-aided design technology and were subsequently translated into 3-dimensional finite element models. Four models were prepared according to different cement types (zinc phosphate, polycarboxylate, glass ionomer, and resin). A load of 700 N was applied vertically on the crowns (8 loading points). Maximum principal stress was determined. RESULTS. Zinc phosphate cement had a greater stress concentration in the cement layer, while polycarboxylate cement had a greater stress concentration on the distal surface of the monolithic zirconia crown and abutment tooth. Resin cement and glass ionomer cement showed similar patterns, but resin cement showed a lower stress distribution on the lingual and mesial surface of the cement layer. CONCLUSION. The test results indicate that the use of different luting agents that have various elastic moduli has an impact on the stress distribution of the monolithic zirconia crowns, cement layers, and abutment tooth. Resin cement is recommended for the luting agent of the monolithic zirconia crowns.

Micro-computed tomography 영상을 이용한 치아의 컴퓨터 3차원 모델 생성 및 유한요소 분석에의 응용

노세라 ( Se Ra Noh ),김명수 ( Myong Soo Kim ) 조선대학교 치의학연구원 2013 Oral Biology Research (Oral Biol Res) Vol.37 No.2

Purpose: Among mechanical stress analysis methods of teeth and prosthetic appliances, finite element analysis using computer generated 3-dimensional models has been widely applied. We tested a new method to generate 3-dimensional tooth models which can be applied to finite element analysis. Materials and Methods: Three-dimensional tooth models were generated from micro-computer tomography images using 3-dimensional graphic software and computer aided design (CAD) software, and the models were applied to finite element analysis. Results: The models generated using this method better mimicked the anatomical structure of natural teeth than those generated by other methods. As a sample case, a 3-dimensional model of an upper first molar tooth with a class I cavity was generated using 3-dimensional CAD software. Finite element analysis was carried out using this model by assuming that the cavity was filled with three different materials. Conclusion: The method used in the present study yielded high-quality 3-dimensional models of teeth that can easily be applied to mechanical stress analysis using finite element analysis and other dental applications.

Development of implant loading device for animal study about various loading protocol: a pilot study

Joon-Ho Yoon,Young-Bum Park,Yuna Cho,Chang-Sung Kim,Seong-Ho Choi,Hong-Seok Moon,Keun-Woo Lee,June-Sung Shim 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.4

PURPOSE. The aims of this pilot study were to introduce implant loading devices designed for animal study and to evaluate the validity of the load transmission ability of the loading devices. MATERIALS AND METHODS. Implant loading devices were specially designed and fabricated with two implant abutments and cast metal bars, and orthodontic expansion screw. In six Beagles, all premolars were extracted and two implants were placed in each side of the mandibles. The loading device was inserted two weeks after the implant placement. According to the loading protocol, the load was applied to the implants with different time and method,simulating early,progressive,and delayed loading. The implants were clinically evaluated and the loading devices were removed and replaced to the master cast, followed by stress-strain analysis. Descriptive statistics of remained strain (με) was evaluated after repeating three cycles of the loading device activation. Statistic analysis was performed using nonparametric, independent t-test with 5% significance level and Friedman's test was also used for verification. RESULTS. The loading devices were in good action. However, four implants in three Beagles showed loss of osseointegration. In stress-strain analysis, loading devices showed similar amount of increase in the remained strain after applying 1-unit load for three times. CONCLUSION. Specialized design of the implant loading device was introduced. The loading device applied similar amount of loads near the implant after each 1-unit loading. However, the direction of the loads was not parallel to the long axis of the implants as predicted before the study.

치위생과 학생들의 스트레스에 대한 체계적 분석과 대학생활 만족도와의 융합 연구

허남숙,이유희 한국융합학회 2018 한국융합학회논문지 Vol.9 No.7

치위생과 학생들의 스트레스 부분을 스트레스 반응 척도를 이용하여 체계적으로 분석하여 대학생활 만족도와의 관련성을 파악하기 위하여 경남지역에 소재한 치위생과 학생 299명을 대상으로 스트레스, 스트레스 반응척도, 대학생활 만족도를 융합연구 하였다. 스트레스 반응척도에 따라 체계적으로 분석한 결과 피로와 좌절, 우울, 분노에서 높은 수치를 나타내었다. 또한 스트레스를 경험한 경우 만족도에도 부정적인 영향을 미쳤다. 스트레스는 심각한 경우 질병으로 이어질 수 있는 부정적인 영향을 줄 수 있다. 대학생활의 스트레스가 부적응과 불만족을 가중 시킬 것을 예상 할 때 스트레스 반응 척도를 이용한 체계적인 분석 연구는 스트레스를 줄이고 대학생활 만족도 향상에 분명히 도움이 될 것으로 판단된다. 이에 대한 방안으로 치위생과에 맞는 스트레스 반응 도구의 개발과 분석을 제안한다. To investigate the relationship between dental hygiene students' stress and college life satisfaction, 299 dental students and students in Gyeongnam area studied stress, stress response scale, and university life satisfaction. The results of systematic analysis according to the scale of stress response showed high values in fatigue, frustration, depression and anger. In addition, satisfaction with stress experienced negatively. Stress can give you a negative impact that can lead to serious illness. A systematic analysis using the stress response scale is expected to help reduce stress and improve college life satisfaction when the stress of college life is expected to increase maladjustment and dissatisfaction. We suggest the development and analysis of a stress response tool suitable for dental hygienists.

티타늄 합금, 지르코니아, 폴리에테르에테르케톤 지대주 재질에 따른 임플란트 구성요소의 응력분포: 유한 요소 분석을 통한 비교 연구

Kim Sung-Min 대한치과기공학회 2024 대한치과기공학회지 Vol.46 No.2

Purpose: This study aimed to analyze the stress distribution and deformation in implant abutments made from titanium (Ti-6Al-4V), zirconia, and polyetheretherketone (PEEK), including their screws and fixtures, under various loading conditions using finite element analysis (FEA). Methods: Three-dimensional models of the mandible with implant abutments were created using Siemens NX software (NX10.0.0.24, Siemens). FEA was conducted using Abaqus to simulate occlusal loads and assess stress distribution and deformation. Material properties such as Young’s modulus and Poisson’s ratio were assigned to each component based on literature and experimental data. Results: The FEA results revealed distinct stress distribution patterns among the materials. Titanium alloy abutments exhibited the highest stress resistance and the most uniform stress distribution, making them highly suitable for long-term stability. Zirconia abutments showed strong mechanical properties with higher stress concentration, indicating potential vulnerability to fracture despite their aesthetic advantages. PEEK abutments demonstrated the least stress resistance and higher deformation compared to other abutment materials, but offered superior shock absorption, though they posed a higher risk of mechanical failure under high load conditions. Conclusion: The study emphasizes the importance of selecting appropriate materials for dental implants. Titanium offers durability and uniform stress distribution, making it highly suitable for long-term stability. Zirconia provides aesthetic benefits but has a higher risk of fracture compared to titanium. PEEK excels in shock absorption but has a higher risk of mechanical failure compared to both titanium and zirconia. These insights can guide improved implant designs and material choices for various clinical needs.

스트레인 게이지를 이용한 임플랜트 지지 오버덴춰의 응력분석

조혜원,권주홍,이화영,Cho, Hye-Won,Kwon, Joo-Hong,Lee, Wha-Young 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.1

Stress distribution on mandibular implants supporting overdentures were registered in vitro experimental model by means of 4 rosette gauges which were placed around the implant. The overdenture attachments used in this study were the Resilient Dolder bar, Rigid Bolder bar, Round bar, Hader bar & Dal-Ro attachment. An occlusal jig was placed on the overdenture and the loading sites were 3 points which mimicked working, balancing, and median relations. With 5 and 10kg loading, strains were measured by strain indicator(P-3500, Measurement group, Raleigh, USA), and using these data, maximum and minimum principal stresses and Von Mises stress were calculated and evaluated. The results were as follows : There was a tendency of high stress concentration in the lingual side of the implant, and in the buccal side low stress was developed regardless of the attachment systems. The resilient Bolder bar concentrated highest stress among the attachment systems, and the Round bar and the Dal-Ro attachment provided comparatively low stresses around the implant. The rigid Bolder bar concentrated high stress in the mesial side, and the Dal-Ro attachment developed tensile stress patterns in the lingual and distal sides of the implant at the balancing relation.