임플란트-지지 후방연장 국소의치에서 지대주 상부 플라스틱 캡의 물성이 응력분산에 미치는 영향 The influence of the property of plastic cap on the abutment at stress distribution in the implant-supported distal extension removable partial denture: Finite element analysis원문보기
Objectives: Recently, the interest in the use of an implant-associated removable partial denture(IARPD) in partial edentulous cases has markedly increased. In this study, the biomechanical behavior of an IAPRD with different stress relieving caps on the healing abutment was evaluated by bidimensiona...
Objectives: Recently, the interest in the use of an implant-associated removable partial denture(IARPD) in partial edentulous cases has markedly increased. In this study, the biomechanical behavior of an IAPRD with different stress relieving caps on the healing abutment was evaluated by bidimensional finite element method. And the difference of the mucogingival hardness in the edentulous ridge on the stress distribution was also evaluated.
Material and methods: A sagittally cut distal extension edentulous model with the #33 and #34 teeth and a removable partial denture of the left mandible was used as a basic anatomic model. Eighteen models were designed with NX 9.0 (Siemens AG, Berlin, Germany). There were three different conditions (mucosa, plastic cap, implant length). The first condition was two material properties of mucosa (M1, M2), and the second condition was depending on plastic cap’s existence and different material properties on implant (C0, C1, C2), and the third condition was three implant lengths (A: 4mm, B:6mm, C:11mm).
The models were loaded with 250 N of axial force on the denture teeth. The finite element analysis was performed with MSC Nastran (MSC Software Corporation, Newport Beach, CA, USA). von-Mises stress maps were plotted to visualize the results. The point values of displacement and von Mises stress were acquired quantitatively.
Results: In the soft edentulous mucogingiva, the use of plastic cap on the healing abutment showed much lower stress concentration on the surrounding bone of the implant and permitted proper displacement values than the hard healing abutment in the stress distribution. Especially, the soft plastic cap showed much lower stress concentration on the surrounding bone of the implant than the hard plastic cap in the stress distribution. The use of long implant was suitable at the soft edentulous mucogingiva which was unfavorable condition to support of function, but on the other hand, the use of short implant was possible at the hard edentulous mucogingiva which contributed to stress distribution.
Conclusions :
1.The use of the stress relieving plastic cap on the healing abutment was better than the healing abutment
only on the stress distribution in the soft edentulous mucogingiva and the soft plastic cap was more effective than the hard plastic cap in the stress distribution.
2.The length of the implant and the hardness of the stress relieving plastic cap on the healing abutment did not have a significant influence on the stress distribution in the hard edentulous mucogingiva.
Objectives: Recently, the interest in the use of an implant-associated removable partial denture(IARPD) in partial edentulous cases has markedly increased. In this study, the biomechanical behavior of an IAPRD with different stress relieving caps on the healing abutment was evaluated by bidimensional finite element method. And the difference of the mucogingival hardness in the edentulous ridge on the stress distribution was also evaluated.
Material and methods: A sagittally cut distal extension edentulous model with the #33 and #34 teeth and a removable partial denture of the left mandible was used as a basic anatomic model. Eighteen models were designed with NX 9.0 (Siemens AG, Berlin, Germany). There were three different conditions (mucosa, plastic cap, implant length). The first condition was two material properties of mucosa (M1, M2), and the second condition was depending on plastic cap’s existence and different material properties on implant (C0, C1, C2), and the third condition was three implant lengths (A: 4mm, B:6mm, C:11mm).
The models were loaded with 250 N of axial force on the denture teeth. The finite element analysis was performed with MSC Nastran (MSC Software Corporation, Newport Beach, CA, USA). von-Mises stress maps were plotted to visualize the results. The point values of displacement and von Mises stress were acquired quantitatively.
Results: In the soft edentulous mucogingiva, the use of plastic cap on the healing abutment showed much lower stress concentration on the surrounding bone of the implant and permitted proper displacement values than the hard healing abutment in the stress distribution. Especially, the soft plastic cap showed much lower stress concentration on the surrounding bone of the implant than the hard plastic cap in the stress distribution. The use of long implant was suitable at the soft edentulous mucogingiva which was unfavorable condition to support of function, but on the other hand, the use of short implant was possible at the hard edentulous mucogingiva which contributed to stress distribution.
Conclusions :
1.The use of the stress relieving plastic cap on the healing abutment was better than the healing abutment
only on the stress distribution in the soft edentulous mucogingiva and the soft plastic cap was more effective than the hard plastic cap in the stress distribution.
2.The length of the implant and the hardness of the stress relieving plastic cap on the healing abutment did not have a significant influence on the stress distribution in the hard edentulous mucogingiva.
주제어
#plastic cap
#stress distribution
#implant-supported distal extension removable partial denture
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