A Comparative Analysis on Two Types of Oral Implants, Bone-Level and Tissue-Level, with Different Cantilever Lengths of Fixed Prosthesis

作者：Mosavar Alireza; Nili Monireh^*; Hashemi Sayed Raouf; Kadkhodaei Mahmoud

来源：Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry, 2017, 26(4): 289-295.

DOI：10.1111/jopr.12388

• Bone-level implant
• tissue-level implant
• cantilever length
• implant-supported fixed prosthesis
• finite element method

PurposeDepending on esthetic, anatomical, and functional aspects, in implant-prosthetic restoration of a completely edentulous jaw, the selection of implant type is highly important; however, bone- and tissue-level implants and their stress distribution in bone have not yet been comparatively investigated. Hence, finite element analysis was used to study the influence of cantilever length in a fixed prosthesis on stress distribution in peri-implant bone around these two types of oral implants.
Materials and MethodsA 3D edentulous mandible was modeled. In simulations, a framework with four posterior cantilever lengths and two types of implants, bone-level and tissue-level, was considered. A compressive load was applied to the distal regions of the cantilevers, and the von-Mises stress of peri-implant bone was investigated. The independent t-test and the Pearson correlation coefficient analyzed the results ( = 0.05).
ResultsStresses in the cortical bone around the bone-level implants were greater than those in the tissue-level implants with the same cantilever length. In addition, by extending the cantilever length, the stress values in peri-implant bone increased. Therefore, when the cantilever was at its maximum length, the maximum stress was in cortical bone and around the bone-level distal implants.
ConclusionThe results of the present study indicate that treatment with tissue-level implants is potentially more advantageous than with bone-level implants for implant-supported fixed prostheses.

• 出版日期2017-6