A retrospective 10-year mean follow-up of implants placed in ridges grafted using autogenous mandibular blocks covered with bovine bone mineral and collagen membrane

Abstract
Objectives: To report the clinical and radiographic outcomes of patients presenting
with edentulous and atrophic ridges and treated with autogenous mandibular bone
blocks and rehabilitated with implant-supported prostheses.
Materials and methods: From 1997 to 2015, 75 patients presenting with bone defects
of the jaws were grafted with autogenous mandibular bone blocks. One-hundred
eighty-two implants were placed 4 to 12 months later and loaded 3 to 10 months
later: the mean follow-up was 10 years (range: 3–16 years). The following outcomes
were recorded: (a) complication rate of the reconstructive procedure; (b) bone graft
resorption before implant placement; (c) peri-implant bone resorption; (d) implantrelated
complications; and (e) implant survival and success rates.
Results: Postoperative recovery was uneventful in the majority of patients. An early
dehiscence occurred in three patients, but with no significant bone loss, while 3 experienced
temporary paraesthesia. The mean vertical and horizontal bone resorption
before implant placement was 0.18 mm (standard deviation [SD] = 0.43) and 0.15 mm
(SD = 0.42), respectively. The mean peri-implant bone loss ± standard deviation was
1.06 ± 1.19 (range: 0.00–5.05) at patient level and 1.11 ± 1.26 (range: 0.00–5.20)
at implant level. Two implants in 2 patients lost integration and were removed; 10
implants in 7 patients developed peri-implantitis, but healed after surgical treatment.
The cumulative implant survival and success rates were 98.11% and 85.16%,
respectively.
Conclusion: Implants placed in areas reconstructed with mandibular bone blocks presented
survival rates consistent with those obtained for implants placed in native
bone.