Abstract：
BACKGROUND: Placement of an implant in the maxillary anterior region is challenging due to the angulation of bone in this area. Angled abutments may be used to achieve proper restorative contours. The present study was undertaken to examine and compare the stress levels of implants in the maxillary anterior region having different types of internal connections and different abutment angulations.
METHODS: Implants with three types of abutment connections, internal conical, Morse taper, and internal hex, were modeled using SolidWorks software. Three abutment angulations of 0, 15, and 30 degrees were used for each type of implant. A 100 N axial load was applied to the implants, and the stresses on the implant, abutment, and bone were analyzed by finite element analysis.
RESULTS: Among the straight abutments, the most stress was in model 3A (62.60 MPa). The stress value among angled abutments was highest with 30-degree angled abutments. The value was highest in model 3C (94.83 MPa). Internal hex connection showed the highest stress levels in all degrees of angulation of the abutment, and Morse taper connection showed the least amount of stress in all three abutment angles. The most stress concentration was seen in the cortical bone on the buccal surface in the implant-abutment junction.
CONCLUSIONS: The Morse taper design of implant exhibited the least-highest stress levels on the alveolar bone. The stress levels increased with the increasing angulation of the implant or implant-abutment connection.
METHODS: Implants with three types of abutment connections, internal conical, Morse taper, and internal hex, were modeled using SolidWorks software. Three abutment angulations of 0, 15, and 30 degrees were used for each type of implant. A 100 N axial load was applied to the implants, and the stresses on the implant, abutment, and bone were analyzed by finite element analysis.
RESULTS: Among the straight abutments, the most stress was in model 3A (62.60 MPa). The stress value among angled abutments was highest with 30-degree angled abutments. The value was highest in model 3C (94.83 MPa). Internal hex connection showed the highest stress levels in all degrees of angulation of the abutment, and Morse taper connection showed the least amount of stress in all three abutment angles. The most stress concentration was seen in the cortical bone on the buccal surface in the implant-abutment junction.
CONCLUSIONS: The Morse taper design of implant exhibited the least-highest stress levels on the alveolar bone. The stress levels increased with the increasing angulation of the implant or implant-abutment connection.
摘要：
背景：由于上颌前部区域的骨骼成角，因此在该区域中放置植入物具有挑战性。倾斜的基台可用于实现适当的修复轮廓。进行本研究是为了检查和比较具有不同类型的内部连接和不同基牙角度的上颌前部区域植入物的应力水平。
方法：具有三种类型的基台连接的植入物，内部圆锥形,莫氏锥度，和内部十六进制，使用SolidWorks软件进行建模。每种类型的植入物使用三个0、15和30度的基牙角度。向植入物施加100N的轴向载荷，以及植入物上的应力，基台,和骨进行了有限元分析。
结果：在直台中，应力最大的是3A型(62.60MPa)。在30度角桥台中，倾斜桥台的应力值最高。该值在型号3C中最高(94.83MPa)。内部六角连接在基台的所有角度中显示出最高的应力水平。莫氏锥度连接在所有三个基台角中显示出最小的应力。最大的应力集中在种植体-基牙交界处的颊表面的皮质骨中。
结论：植入物的Morse锥度设计在牙槽骨上表现出最低的应力水平。应力水平随着植入物或植入物-基牙连接的角度的增加而增加。
方法：具有三种类型的基台连接的植入物，内部圆锥形,莫氏锥度，和内部十六进制，使用SolidWorks软件进行建模。每种类型的植入物使用三个0、15和30度的基牙角度。向植入物施加100N的轴向载荷，以及植入物上的应力，基台,和骨进行了有限元分析。
结果：在直台中，应力最大的是3A型(62.60MPa)。在30度角桥台中，倾斜桥台的应力值最高。该值在型号3C中最高(94.83MPa)。内部六角连接在基台的所有角度中显示出最高的应力水平。莫氏锥度连接在所有三个基台角中显示出最小的应力。最大的应力集中在种植体-基牙交界处的颊表面的皮质骨中。
结论：植入物的Morse锥度设计在牙槽骨上表现出最低的应力水平。应力水平随着植入物或植入物-基牙连接的角度的增加而增加。
