Abstract：
OBJECTIVE: The success rate of the implant treatment, including aesthetics and long-term survival, relies heavily on preserving crestal peri-implant bone, as it determines the stability and long-term outcomes. This study aimed to demonstrate the stress differences in the crestal bone resulting from dental implant placement at various depths relative to the crestal bone level using finite element analysis.
METHODS: Three study models were prepared for implant placement at the crestal bone level (CL), 1 mm depth (SL-1), and 2 mm depth (SL-2). Implants were placed in the maxillary central incisor region of each model, and 100 N vertical and oblique forces were applied. The von Mises, maximum principal (tensile), and minimum principal (compressive) stresses were evaluated.
RESULTS: The CL model exhibited the highest stresses on the implant, abutment, and abutment screws under vertical and oblique forces. For maximum principal stress in the crestal bone under vertical force, the SL-2, SL-1, and CL models recorded values of 6.56, 6.26, and 5.77 MPa, respectively. Under oblique forces, stress values for SL-1, SL-2, and CL were 25.3, 24.91, and 23.76 MPa, respectively. The CL model consistently exhibited the lowest crestal bone stress at all loads and the highest stress values on the implant and its components. Moreover, considering the yield strengths of the materials, no mechanical or physiological complications were noted.
CONCLUSIONS: Placing the implant at the crestal level or subcrestally beyond the cortical layer could potentially reduce stress and minimize crestal bone loss. However, further studies are warranted for confirmation.
METHODS: Three study models were prepared for implant placement at the crestal bone level (CL), 1 mm depth (SL-1), and 2 mm depth (SL-2). Implants were placed in the maxillary central incisor region of each model, and 100 N vertical and oblique forces were applied. The von Mises, maximum principal (tensile), and minimum principal (compressive) stresses were evaluated.
RESULTS: The CL model exhibited the highest stresses on the implant, abutment, and abutment screws under vertical and oblique forces. For maximum principal stress in the crestal bone under vertical force, the SL-2, SL-1, and CL models recorded values of 6.56, 6.26, and 5.77 MPa, respectively. Under oblique forces, stress values for SL-1, SL-2, and CL were 25.3, 24.91, and 23.76 MPa, respectively. The CL model consistently exhibited the lowest crestal bone stress at all loads and the highest stress values on the implant and its components. Moreover, considering the yield strengths of the materials, no mechanical or physiological complications were noted.
CONCLUSIONS: Placing the implant at the crestal level or subcrestally beyond the cortical layer could potentially reduce stress and minimize crestal bone loss. However, further studies are warranted for confirmation.
摘要：
目的：种植治疗的成功率，包括美学和长期生存，在很大程度上依赖于保存种植体周围骨骼，因为它决定了稳定性和长期结果。这项研究旨在使用有限元分析来证明牙科植入物放置在相对于the骨水平的不同深度处引起的the骨应力差异。
方法：制备了三个研究模型，用于在颌骨水平（CL）放置植入物，1mm深度(SL-1),和2毫米的深度（SL-2）。将植入物放置在每个模型的上颌中切牙区域，并施加了100N的垂直和倾斜力。冯·米塞斯,最大主要(拉伸),和最小主（压缩）应力进行了评估。
结果：CL模型在植入物上表现出最高的应力，基台,和支座螺钉在垂直和斜力下。对于垂直力作用下的弓骨中的最大主应力，SL-2、SL-1和CL模型记录的值为6.56、6.26和5.77MPa，分别。在斜力作用下,SL-1、SL-2和CL的应力值分别为25.3、24.91和23.76MPa，分别。CL模型在所有载荷下始终表现出最低的牙髓骨应力，并且在植入物及其组件上表现出最高的应力值。此外，考虑到材料的屈服强度，未发现机械或生理并发症.
结论：将植入物放置在骨板水平或骨板下超出皮质层可能会降低应力并最大程度地减少骨板丢失。然而,需要进一步的研究确认.
方法：制备了三个研究模型，用于在颌骨水平（CL）放置植入物，1mm深度(SL-1),和2毫米的深度（SL-2）。将植入物放置在每个模型的上颌中切牙区域，并施加了100N的垂直和倾斜力。冯·米塞斯,最大主要(拉伸),和最小主（压缩）应力进行了评估。
结果：CL模型在植入物上表现出最高的应力，基台,和支座螺钉在垂直和斜力下。对于垂直力作用下的弓骨中的最大主应力，SL-2、SL-1和CL模型记录的值为6.56、6.26和5.77MPa，分别。在斜力作用下,SL-1、SL-2和CL的应力值分别为25.3、24.91和23.76MPa，分别。CL模型在所有载荷下始终表现出最低的牙髓骨应力，并且在植入物及其组件上表现出最高的应力值。此外，考虑到材料的屈服强度，未发现机械或生理并发症.
结论：将植入物放置在骨板水平或骨板下超出皮质层可能会降低应力并最大程度地减少骨板丢失。然而,需要进一步的研究确认.
