Early healing of implants placed into fresh extraction sockets: an experimental study in the beagle dog. II: ridge alterations.
OBJECTIVE
To describe the early phases of healing at the alveolar ridge around dental implants placed into fresh extraction sockets and to study whether (i) the dimension of the socket and (ii) a new implant surface nano-topography may have any influence.


METHODS
Sixteen beagle dogs received 64 test (new surface) and control implants randomly placed at the distal socket of 3P3 and 4P4. The implant shoulder was levelled with the marginal buccal bone crest. Animals were sacrificed at 4 h, 1, 2, 4 and 8 weeks for histological examination.


RESULTS
Bone loss occurred at the buccal crest between the 4-h and 1-week healing intervals, being more pronounced at the third premolar site [vertical bone loss between day 0 and 8 weeks 1.1 (0.5) mm]. The corresponding loss at the fourth premolar site was 0.3 (0.5) mm. Test sites containing implants with discrete crystalline deposition nano-particles' surface exhibited less buccal bone resorption than control sites at 8 weeks.


CONCLUSIONS
Dimensions of the socket influenced the process of wound healing of implants placed into fresh extraction sockets, with more bone loss in the narrower sockets; however, the implant surface nano-topography seemed to have a limited effect in the healing of this implant surgical protocol.
Vignoletti
Fabio
F
Department of Periodontology, Universidad Complutense de Madrid, Madrid, Spain. fabiovignoletti@mac.com
de Sanctis
Massimo
M
Berglundh
Tord
T
Abrahamsson
Ingemar
I
Sanz
Mariano
M
D016301:Alveolar Bone Loss / Q000209:etiology; D000539:Alveolar Process / Q000473:pathology; D000818:Animals; D001641:Bicuspid / Q000473:pathology / Q000601:surgery; D016723:Bone Remodeling / Q000502:physiology; D001862:Bone Resorption / Q000503:physiopathology; D002130:Calcium Phosphates / Q000737:chemistry; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D004285:Dogs; D023421:Models, Animal; D053758:Nanoparticles / Q000737:chemistry; D010012:Osteogenesis / Q000502:physiology; D011897:Random Allocation; D013499:Surface Properties; D013997:Time Factors; D020390:Tooth Socket / Q000473:pathology / Q000601:surgery*; D014945:Wound Healing / Q000502:physiology
D002130:Calcium Phosphates; D015921:Dental Implants; D003764:Dental Materials; C020243:calcium phosphate