Marginal bone loss evaluation around immediate non-occlusal microthreaded implants placed in fresh extraction sockets in the maxilla: a 3-year study
, , , , , . Marginal
bone loss evaluation around immediate non-occlusal microthreaded
implants placed in fresh extraction sockets in the maxilla: a 3-year
study. Clin. Oral Impl. Res. 00, 2014; 1–7.
Abstract
Objective
To
evaluate marginal bone loss over 3 years around immediate microthreaded
implants placed in the maxillary anterior/esthetic zone and immediately
restored with single crowns.
Material and methods
Seventy-one
implants (with microthreads up to the platform – rough surface body and
neck, internal connection and platform switching) were placed in fresh
extraction sockets in the maxillary arches of 30 men and 23 women (mean
age 37.85 ± 7.09 years, range 27–60). All subjects had at least 3 mm of
soft tissue to allow the establishment of adequate biologic width and to
reduce bone resorption. Each patient received a provisional restoration
immediately after implant placement with slight occlusal contact.
Mesial and distal bone height was evaluated using digital radiography on
the day following implant placement (baseline) and after 1, 2, and
3 years. Primary stability was measured with resonance frequency
analysis.
Results
No
implants failed, resulting in a cumulative survival rate of 100% after
3 years. Marginal bone loss from implant collar to bone crest measured
at baseline (peri-implant bone defect at the fresh extraction socket)
and after 3 years was 0.86 mm ± 0.29 mm. Mesial and distal site crestal
bone loss ranged from 3.42 mm ± 1.2 mm at baseline to 3.51 mm ± 1.5 mm
after 3 years (P = 0.063) and from 3.38 mm ± 0.9 mm at baseline to 3.49 mm ± 0.9 mm after 3 years, respectively (P = 0.086).
Conclusions
This
prospective study found minimal marginal bone loss and a 100% implant
survival rate over the 3-year follow-up for microthreaded immediate
implants subjected to immediate non-occlusal loading.
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