Abstract
The present study investigated the influence of the connection angle between the implant body with 20° and 30° inclinations, morse taper abutment (8° and 10°) and crown-to-implant ratio (C/I = 0.93 and 1.33) on the maximum bending load and strain of the collar. The following results were obtained.
The maximum bending load of the implant (C/I = 0.93) with 20° and 30° inclinations was larger with the connection angle of 8° than 10°. However, there was no influence of the connection angle on the extent of deflection. In contrast, there was no influence of the connection angle of the implant (C/I = 1.33) with 20° and 30° inclinations on the maximum bending load or deflection.
Under the conditions of a 20° inclination angle and C/I = 0.93, 0.1％ strain of the collar was confirmed. A 400 N load was applied with a connection angle of 8°, and a 300 N load was applied with a connection angle of 10°. Under the condition of a 30° inclination angle, a 200 N load was applied with connection angles of both 8° and 10°. Under the conditions of a 20° inclination angle and C/I = 1.33, more than 0.1％ strain of the collar was confirmed. A 350 N load was applied with a connection angle of 8°, and a 300 N load was applied with a connection angle of 10°. Under the condition of a 30° inclination angle, 0.1％ strain of the collar was confirmed when a 200 N load was applied with connection angles of 8° and 10°. The amount of strain of the implant of 20° inclination, compared with under the 800 N load in C/I ratio 1.33 was the almost same as that of the implant of 30° inclination under the 450 N load.
The inclination angle and C/I ratio were large during implant placement, and the maximum bending load was small for both connection angles (8° and 10°). The strain of the collar was marked when a low load was applied.
These results suggest that the inclination angle, superstructure height and connection angle of the abutment should be considered at implant placement.
