Bone remodeling to maintain osseointegration between bone and implant is absolutely essential to ensure favorable results and long-term stability in implant treatment [1,2]. Bone remodeling requires that various stresses generated around the bone caused by the occlusal load applied to the implant be within an appropriate range. Concentrations of stress at the bone-implant interface, which are caused by overloading, have been reported to result in bone resorption [3-5]. However, much remains to be understood about the relationship between mechanical stimulation of the bone and bone dynamics. It is therefore very important to shed light on how peri-implant bone is affected under various conditions, such as the positioning of the implant, placement angle, and bone quality. In recent years, a number of studies using biomechanical investigations have been performed to explore these clinical issues [6-10]. Photoelastic tests, strain gauge method, and three-dimensional finite element analyses (FEAs) have been used in typical biomechanical investigations. In experimental analyses, the photoelastic test and strain gauge method have the advantage of measuring the actual implant. However, the photoelastic test has the disadvantage that model fabrication is complicated. A disadvantage of the strain gauge method is that it is not possible to measure the subject’s entire stress. On the other hand, it is possible to use an FEA to ascertain the stress distributions of a subject’s interior, which are difficult to measure in an experimental analysis. To extract various physical data such as stress, strain, and displacement, conditions can be set more easily than in other biomechanical investigations [11]. This is the reason why FEAs have been studied in typical biomechanical investigations in recent years.

However, three-dimensional FEA of living tissue entails some disadvantages, including the large number of condition settings and assumptions often included and the complexity of internal structures and behaviors. Moreover, there are lingering questions about the reliability of results produced from a stress analysis, and it is difficult to ensure the validity of the results. One method to verify the validity of three-dimensional FEA models is to carry out experimental analyses in parallel to confirm the extent to which actual behaviors are reproduced and to determine the consistency in displacement between the two models [12-15]. In the future, it appears necessary to fabricate a three-dimensional FEA model that is reproducible and valid to continue revealing problems that arise when actual implant treatments are performed.