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Ridge alterations after implant placement in fresh extraction sockets or in healed crests: An experimental in vivo investigation.

Vignoletti, Fabio; Sanz-Esporrin, Javier; Sanz-Martin, Ignacio; Nuñez, Javier; Luengo, Fernando; Sanz, Mariano.
Clin Oral Implants Res; 30(4): 353-363, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30864234

OBJECTIVES:

To study the early and late bone healing around implants placed according to a flapless immediate (test) or flapped delayed (control) implant surgical protocol. MATERIALS AND

METHODS:

In eight beagle dogs, immediate and delayed implants were placed. Test and control implants were randomly assigned, and horizontal and vertical bone remodelling, as well as bone-to-implant contact (BIC), were assessed with histology at 2 and 8 weeks. Teeth were used as negative controls.

RESULTS:

Similar results were attained in the two groups when the vertical resorption of the buccal bone crest was evaluated (approximately 0.5 mm). On the other hand, a marked horizontal buccal bone resorption was observed. Immediate implants attained a thinner buccal bone crest as compared to the delayed implant and the tooth. De novo bone formation on the implant surface appeared to be more pronounced at delayed sites at 2 weeks, whereas at 8 weeks, no difference in BIC was observed.

CONCLUSIONS:

Ridge alterations occurred at both implant placement protocols, with similar limited amounts of vertical buccal bone reduction and a pronounced horizontal bone reduction. The process of horizontal bone remodelling differed between the two surgical protocols.