2024 Volume 37 Issue 2 Pages 145-154
Purpose : This study examined the effects of implant connection design and inclination angle on bending load.
Materials and Methods : Experimental implants were manufactured using a type 4 titanium cementable abutment (TP), straight abutment type (IA) and an inclination of 5° type (IB) with internal taper joint. Bending load and deflection amount were measured for five implants each, using a universal testing machine, at inclination angles of 10°, 20°, and 30°. An analysis of variance was performed to compare significant differences among several groups and Tukeyʼs multiple comparison test (critical rate : 5％). After measurement, each specimen was observed by CT.
Results : The approximate bending load at an inclination angle of 10° was 5,060 N for TP, 3,850 N for IB, and 3,030 N for IA, which was the smallest, with significant differences (p＜0.001) observed among the implants. At an inclination angle of 20°, the approximate bending load was 1,640 N for TP, and those for IA and IB were 1,420 N, with significant differences observed between TP-IA (p＜0.001) and TP-IB (p＜0.001), respectively. The approximate bending load at an inclination angle of 30° was 910 N for TP, 870 N for IA, and 840 N for IB, with significant differences observed between TP-IA (p＜0.001), IA-IB (p＜0.001), and IA-IB (p＝0.008), respectively. The deflection value was 0.49-0.68 mm at an inclination angle of 10°, with significant differences observed between TP-IA (p＜0.001) and IA-IB (p＜0.001), respectively. At an inclination angle of 20°, the deflection value was 0.56-0.61 mm with no significant difference observed, and at an inclination angle of 30°, it was 0.70-0.84 mm with significant differences observed between TP-IA (p＝0.004) and TP-IB (p＜0.001), respectively. CT observations showed gaps between the abutment and collar part at inclination angles of 20° and 30° in each specimen.
Conclusion : It was revealed that the connection method and angle of inclination affected bending load, amount of deflection, and the formation of gaps in the connecting parts.
