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Ridge alterations following immediate implant placement in the dog: flap versus flapless surgery


  • Conflict of interest and source of funding statement
    The authors declare that they have no conflict of interests. This study was partially supported by Straumann Iberian (Straumann, Madrid, Spain).

Dr. Juan Blanco
Department of Estomatology
School of Medicine and Odontology
University of Santiago de Compostela
C/ Entreríos s/n
15705. Santiago de Compostela


Objective: To assess the healing process after flap or flapless surgery in immediate implant placement.

Material and Methods: This study was carried out on five Beagle dogs. Four implants were placed in the lower jaw in each dog immediately after tooth extraction. Flap surgery was performed before the extraction on one side (control), and flapless on the contrary (test). After 3 months of healing, the dogs were sacrificed and prepared for histological analysis.

Results: Ten implants were placed in each group. Two failed (one of each group). The percentage of bone–implant contact was very similar in both groups: 64.8% and 65.1% for the flap and the flapless group, respectively. The difference between the mean distance from the peri-implant mucosa margin to the first bone–implant contact at the buccal aspect was statistically significant between both groups (3.02 mm. flapless and 3.69 mm. flap group). The mean first bone–implant contact at the buccal aspect was located in relation to the sand-blasted and acid-etched level at 0.82 mm for the flapless group and 1.33 mm for the flap group. This difference was not statistically significant.

Conclusion: Flapless immediate implant surgery produces a significant reduction in the vestibular biologic width and a minor reduction in buccal bone plate resorption.

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