Comparison of Clinical and Radiographic Outcomes Between Platform Switched Rough Collar Implants and Platform Matched Smooth Collar Implants: A 1-Year Randomized Clinical Trial.
AUTHOR
-- BY Oh TJ, Bashutski J, Wang HL, Rudek I, Chan HL
Purpose: The aim
of this study was to evaluate and compare the clinical and radiographic
outcomes of single implants with a platform-switched rough collar (PSRC) and a
platform-matched smooth collar (PMSC).
Materials and methods: Twenty-six patients missing a tooth in the anterior maxilla
(through the premolars) were randomly assigned to the PSRC or the PMSC group.
All implants were placed in a flapless approach and restored with an early
loading protocol. Clinical measurements were performed at surgery, loading, and
at 3, 6, and 12 months after loading. In addition, radiographic evaluations
were carried out using standardized periapical radiographs and cone beam
computed tomography. Patient satisfaction surveys were completed, and microbial
analysis with DNA probes was performed.
Results: The
implant survival rate was 100% for both groups. The mean marginal bone level
(MBL) was significantly higher in the PSRC group compared to the PMSC group at
all time points. From the 2-week postoperative visit to 1 year postloading, the
mean MBL change in the PSRC group was 0.21 ± 0.56 mm and in the PMSC group it
was 0.74 ± 0.47 mm. Soft tissue profiles were stable over time, with no
significant differences between groups. There were no significant differences
between groups in the number of microbial species seen. Patients in both groups
were highly satisfied with postoperative and postprosthetic experiences.
Conclusion: In this
study, the PSRC method preserved marginal bone by a mean of 0.53 mm more than
the standard PMSC protocol. Within the limitations of the present study, it can
be concluded that the PSRC protocol may be beneficial in marginal bone
preservation. Longitudinal studies are needed to verify the long-term effects
of this approach.
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