Osseointegration at implants placed into delayed reimplanted roots: an experimental study in dogs

Area of Science:

• Dental Implantology
• Periodontology
• Biomaterials Science

Background:

• Delayed reimplantation of avulsed teeth can lead to ankylosis and external replacement resorption.
• Dental implants offer a prosthetic solution for replacing non-vital teeth.
• Understanding bone repair around implants in compromised root environments is crucial.

Purpose of the Study:

• To evaluate peri-implant bone repair around implants placed into the roots of delayed reimplanted teeth.
• To compare bone-to-implant contact (BIC%) in immediate implants versus implants placed in ankylosed roots.

Main Methods:

• Mandibular premolars from beagle dogs were used for delayed reimplantation.
• Two groups were established: immediate implants in fresh extraction sockets and experimental implants in ankylosed roots.
• Histomorphometric evaluation of peri-implant bone repair was performed after 4 months of healing.

Main Results:

• Eleven of twelve experimental implants showed clinical and radiographic success.
• Immediate implants had lower BIC% in the coronal portion (42.2%) compared to the apical portion (55.1%).
• Experimental implants also showed lower BIC% coronally (36.9%) versus apically (45.3%).

Conclusions:

• The immediate implant group demonstrated a trend towards higher BIC% and mineralization compared to the experimental group.
• While differences were observed, they did not reach statistical significance.
• Peri-implant bone repair in ankylosed roots presents challenges for immediate implant success.