International Journal of General Medicine (Mar 2022)
Biomechanical Assessment of Tilted Mandibular Second Molars with Full-Crown Adjacent to Implant-Supported Restoration: 3D Finite Element Analysis
Abstract
Ning Li,* Yusi Li,* Yiming Gao, Liting Jiang Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University, Shanghai, 200025, People’s Republic of China*These authors contributed equally to this workCorrespondence: Liting Jiang; Yiming Gao, Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University, No. 197, The Second Ruijin Road, Huangpu District, Shanghai, 200025, People’s Republic of China, Tel +86 21 64370045, Email [email protected]; [email protected]: The aim of this study was to investigate the effects of tooth root inclination and crown preparation angulation on the stress distribution of tilted second molars, supporting structures and adjacent implant by using the finite element analysis method.Materials and Methods: 3D finite element models of tilted second molar and tooth-supporting structures, including the two designs with three different angles of root inclination and crown preparation angulations, were constructed for full-crown restoration. For all models, the stress distribution was analyzed under vertical and oblique loading conditions.Results: The maximum equivalent stress (MES) increased as root inclination increased, and the highest stress value occurred in the tooth root furcation of the model with 30° root inclination under oblique loading. When root inclination was the same, the MES of each structure was approximate under the same direction load regardless of crown preparation angulation. Higher stress values were found on the tooth root, periodontal ligament, and cortical bone of all models under oblique load compared with vertical load. The highest stress value occurred in the distal adjacent area of implant.Conclusion: Tooth roots with less than 30° inclination, occlusal preparation parallel to the bite plane and small oblique force loading are recommended as significant considerations for full-crown restoration of a mesial inclined mandibular second molar.Keywords: tilted mandibular second molar, full-crown restoration, implant, 3D finite element analysis
