Influence of the length and location of implants on distal extension removable partial dentures: finite element analysis.
10.14368/jdras.2015.31.3.186
- Author:
Jin Hee KIM
1
;
Jin Hyun CHO
;
Cheong Hee LEE
Author Information
1. Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea. chlee@knu.ac.kr
- Publication Type:Original Article
- Keywords:
implant-associated removable partial denture;
distal extension removable partial denture;
implant length;
stress distribution
- MeSH:
Denture Bases;
Denture, Partial, Removable*;
Finite Element Analysis*;
Mandible;
Prognosis;
Tooth;
Tooth, Artificial
- From:Journal of Dental Rehabilitation and Applied Science
2015;31(3):186-194
- CountryRepublic of Korea
- Language:Korean
-
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.
