Mechanical properties of Ti-6Al-4V alloy mini-implant system

A mini implant system made from Ti-6Al-4V alloy was used as the experimental material. The pull-out strength between the implant fixture and abutment was evaluated after the implant fixture and tapered abutment had been fixed by static compression loading, and hit with a mallet. Moreover, the fatigue limit was evaluated based on ISO/FDIS 14801:2003(E). In cases with compressive loading of 10, 50, 100, 150 and 200 N, the measured full-out load was 17.1 N, 33.6 N, 86.9 N, 99.7 N and 157.6 N, respectively. The full-out load measurements were 139.1 N and 195.6 N in the case of the mallet weight of 70 and 130 g, respectively (P < 0.05). The measured pull-out strength increased with increasing weight and number of mallet strokes, and the compression load. The compressive strength was examined according to the implant angle. The compressive strength in the 30° group was 532.2 ± 56.7 N, which was the highest value. On the other hand, the compressive strength in the 60° and 90° group was 156.7 ± 12.6 N and 117.3 ± 6.0 N, respectively. The fatigue life increased with decreasing applied strength level and the fatigue limit was 240 N.