2025 Volume 38 Issue 1 Pages 23-32
Purpose : This study examined the relationship between the effects of strain and angle of inclination on the color of two types of implant : one with a morse taper connection and the other with an internal connection method.
Materials and Methods : Implants were machined using JIS type 4 titanium with similar dimensions : a cementable abutment (TP), a straight abutment (IA), and an inclination of 5° type (IB) with internal taper joint. Strain gauges were attached to the collar portions of each implant and fixed at an angle of inclination of 10°, 20° or 30°. Loads were applied every 50 N from 50 N to 700 N using a universal testing machine. After measurement, each specimen was observed by X-ray CT. An analysis of variance was performed to compare significant differences among several groups, as well as the Tukey multiple comparison test (critical rate, 5％)
Results: There was no difference in the strain in the color areas of TP, IA and IB at 10° inclination. The strain of TP, IA and IB at 20° inclination did not show any difference up to 350 N load, but the strain of IB was minimal from 400 N (p＝0.046), with a significant difference observed between TP and IB. Strain at 30° inclination was measured to be greater in IB than in TP and IA from 50 N to 700 N load, with a significant difference observed between each implant (p＜0.001). A large gap between the abutment and the color was observed in IB with a large strain at 30° inclination. The deflection value increased as inclination angle increased.
Conclusion : It was revealed that the connection method, shape of abutment and angle of inclination affected the strain, amount of deflection and gap.
