Figure 1.
Three types of C/I with prepared different bone loss.
Figure 2.
Design of the animal experiment.
Figure 3.
Superstructure constructed from a gold–silver–palladium alloy using an articulator.
Figure 4.
Superstructures are attached to the lower implants at a height of 8 mm.
The occlusal plate is attached to the maxillary molars to maintain occlusal contact without any lateral loadings by the superstructures.
Figure 5.
Measurement of vertical marginal bone loss around implant (MBL).
(1) IR: Implant length of Radiograph (perpendicular distance from the implant shoulder to the most apical aspect of the implant.) and (2) MBLR: Radiographically evaluated MBL. MBLRm is the average perpendicular distance from implant shoulder to first visible apical bone-to-implant contact at the mesial side. MBLRd is the same at the distal side. MBLR is calculated by the average value of MBLRm and MBLRd.
Figure 6.
The region under observation extends from buttom of the threads of the implant to1 mm distance at both mesial and distal sides.
Figure 7.
ISQ values at 0, 12, and 24 weeks.
Lowest ISQ values are shown in High C/I group. Values are increased with time in all 3 groups, however there is no significant difference among 3 groups at each week (p>0.05).
Figure 8.
Changes of MBL between 12 and 24 weeks.
Highest change is shown in High C/I group, however MBLs in different C/I groups do not show any significant difference (p>0.05).
Figure 9.
(A) Inflammatory reaction was observed only in the crevicular epithelium.
(B) No bone destruction was caused by inflammatory changes.
Figure 10.
Histological specimen of High, Mid and Low C/I at 24 weeks.
All implants in 3 groups are well osseointegrated (Upper side). Broad active remodeling is detected in High C/I group with more fluorescence-labeled bone than in Mid C/I and Low C/I groups (Lower side).