Stability of implants placed simultaneously or in a delayed manner on fresh frozen onlay allografts in rabbits.
OBJECTIVE
This study evaluated the stability of implants installed simultaneously and in a delayed manner in fresh frozen onlay allografts in the tibiae of rabbits.


METHODS
Analyses of the resonance frequency (ISQ) and removal torque were performed. The calvarium of three rabbits was used as donor site. Ten New Zealand female rabbits received four allografts of the same dimensions, two in each tibia. The tibiae were randomly allocated into the following two groups: Group 1, the tibiae that received implants after 84 days of healing, and Group 2, those who received the implants simultaneously with the grafts. Both groups were followed for 126 days. Proximal implants in each group were evaluated by resonance frequency (ISQ) on days 0 and 126, and the distal ones with removal torque on day 126.


RESULTS
In both groups, an increase in the ISQ value of day 0-126 was observed, with a statistically significant difference (Group 1 P = 0.049 and Group 2 P = 0.021). When comparing the resonance frequency at day 0 to day 126, and the gain of stability between these days, no statistically significant difference between groups could be observed. The removal torque showed a statistically significant difference between groups 1 and 2 (P = 0.042).


CONCLUSIONS
There was an increase in stability in groups according to the analysis of resonance frequency. Implants installed in a delayed manner in allografts showed higher shear force, according to the removal torque analysis.
Department of Implantology, UNISA, São Paulo, Brazil.
Erica
E
Fraguas
Marna
M
Ribeiro
Alberto
A
Croci
Luiz
L
Santos
Débora
D
Pallos
Wilson
W
Sendyk
D000818:Animals; D001696:Biomechanical Phenomena; D016025:Bone Transplantation; D015921:Dental Implants; D005260:Female; D020007:Implants, Experimental; D016348:Osseointegration / Q000502:physiology*; D019919:Prosthesis Implantation; D011817:Rabbits; D012886:Skull / Q000601:surgery; D013977:Tibia / Q000601:surgery; D019415:Torque
D015921:Dental Implants