후방연장 가철성 국소의치에서 임플란트의 길이와 위치가 응력분산에 미치는 영향
Influence of the length and location of implants on distal extension removable partial dentures: finite element analysis
김진희, 조진현, 이청희,
소속 상세정보
김진희 ( Kim Jin-Hee ) - 경북대학교 치의학전문대학원 치과보철학교실
조진현 ( Cho Jin-Hyun ) - 경북대학교 치의학전문대학원 치과보철학교실
이청희 ( Lee Cheong-Hee ) - 경북대학교 치의학전문대학원 치과보철학교실
KMID : 1004520150310030186
Abstract
Purpose: To evaluate the effects of implant location and length on stress distribution and displacement in osseointegrated-implants that were associated with mandibular distal extension removable partial dentures (DERPD).
Materials and Methods: A sagittally cut model with the #33, #34 teeth and a removable partial denture of the left mandible was used. Seven models were designed with NX 9.0. Models A, B, C had implants with lengths of 11 ,6, 4 mm, respectively, under the denture base of the #37 artificial tooth. Models D, E, F had implants with lengths of 11, 6, 4 mm, respectively, under the denture base of the #36 artificial tooth. Model G did not have any implants. Axial force (250 N) was loaded on #36 central fossa. The finite element analysis was performed with MSC Nastran. Von Mises stress maps were plotted to visualize the results.
Results: The models of #37 implant placement showed much lower stress concentration on the surrounding bone of the implant compared with #36. The #36 implant position tended to reduce displacement more than #37.
Conclusion: When an IARPD is designed, the distal positioning of implant placement has more advantages in the edentulous bone of DERPD on the prognosis of short implants and the stress distribution of edentulous alveolar bone. Using implants with longer lengths are important for stress distribution. However, Additional studies are necessary of the
effects of length on implant survival.
키워드
임플란트 지지형 가철성 국소의치; 후방연장 가철성 국소의치; 임플란트 길이; 응력 분산
implant-associated removable partial denture; distal extension removable partial denture; implant length; stress distribution
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