The Effect of the Length and Distribution of Implants for Fixed Prosthetic Reconstructions in the Atrophic Posterior Maxilla: A Finite Element Analysis

Materials

Nilufer Bolukbasi Balcioglu¹  Brunilda Gashi Cenkoglu²  Tayfun Ozdemir³  Eitan Mijiritsky³ 

[1] Maxillofacial Surgery, Faculty of Dentistry, Albanian University, 1001 Tirana, Albania;;Department of Oral &Department of Oral Implantology, Faculty of Dentistry, Istanbul University, 34093 Istanbul, Turkey;

关键词: dental implant;    finite element analysis;    atrophic maxillary sinus;    prosthodontics;    stress;    overload;   

DOI  :  10.3390/ma12162556

来源: DOAJ

【 摘 要 】

In this study, different prosthetic designs that could be applied instead of advanced surgical techniques in atrophic maxilla were evaluated with finite element analysis. Atrophic posterior maxilla was modeled using computer tomography images and four models were prepared as follows: Model 1 (M1), two implants supporting a three-unit distal cantilever prosthesis; Model 2 (M2), two implants supporting a three-unit conventional fixed partial denture; Model 3 (M3), three implants supporting three connected crowns; and Model 4 (M4), two implants supporting two connected crowns. Implants 4 mm in width and 8 mm or 13 mm in length were used. A linear three-dimensional finite element programme was used for analysis. The maximum principle stress (tensile) and minimum principle stress (compressive) were used to display stress in cortical and cancellous bones. The von Mises criteria were used to evaluate the stress on the implants. M1 was found to be the most risky model. The short dental arch case (M4) revealed the lowest stresses among the models but is not recommended when one more implant can be placed because of the bending forces that could occur at the mesial implant. In M2 and M3, the distal implants were placed bicortically between the crestal and sinus cortical plates, causing a fall of the stresses because of the bicortical stability of these implants.

【 授权许可】

Unknown