Effect of Loading Angles and Implant Lengths on the Static and Fatigue Fractures of Dental Implants

Abstract

Mechanical properties play a key role in the failure of dental implants. Dental implants require fatigue life testing before clinical application, but this process takes a lot of time. This study investigated the effect of various loading angles and implant lengths on the static fracture and fatigue life of dental implants. Implants with lengths of 9 mm and 11 mm were prepared. Static fracture tests and dynamic fatigue life tests were performed under three loading angles (30°, 40°, and 50°), and the level arm and bending moment were measured. After that, the fracture morphology and fracture mode of the implant were observed. The results showed that 9 mm length implants have a higher static failure load and can withstand greater bending moments, while 11 mm length implants have a longer fatigue life. In addition, as the loading angle increases, the static strength and bending moment decrease linearly, and the fatigue life shows an exponential decrease at a rate of three times. Increasing the loading angle reduces the time of the implant fatigue test, which may be an effective method to improve the efficiency of the experiment.

Stress-strain and fatigue life numerical evaluation of two different dental implants considering isotropic and anisotropic human jaw

“…Sun et al 22 analyzed, by FEA, the influence of screw taper angle, observing that the 30° case had less wear and anti-loosening performance but lower life cycle than 180° one. He also evaluated the impact of loading angles and implant lengths 23 : the longer designs (11 vs 9 mm) presented better fatigue response whereas when the load angle increased, the fatigue life showed an exponential drop. In addition, the kind of abutment connection is also relevant as demonstrated by On et al 24 and by Gil et al 25 The thread type was investigated by Geramizadeh et al 26 discovering that the combination of microthreads in the upper area and V-shape in the rest of the body provided the best distribution of stress.…”

Effects of abutment screw preload and preload simulation techniques on dental implant lifetime

“… 3 – 6 The loading condition plays a vital role in the performance of dental implants. 7 , 8 A multicomponent dental implant assembly consists of an implant fixture, an abutment, and a connector screw. Generally, a torque is applied to the connector screw using a torque wrench to fix the abutment to the implant fixture adequately.…”

Does the Length of Mini Dental Implants Affect Their Resistance to Failure by Overloading?

“…However, several studies have reported dental implant mechanical performance using only the static loading part of the ISO 14801 protocol. Several reasons were described that prevented the use of cyclic testing of the ISO 14801, including a large sample size, more extended testing periods, and increased cost [ 42 , 43 ].…”