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The International Journal of Oral & Maxillofacial Implants
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Int J Oral Maxillofac Implants 34 (2019), No. 1     21. Mar. 2019
Int J Oral Maxillofac Implants 34 (2019), No. 1  (21.03.2019)

Page 179-186, doi:10.11607/jomi.6954, PubMed:30282088


Radiographic Assessment of Crestal Bone Loss in Tissue-Level Implants Restored by Platform Matching Compared with Bone-Level Implants Restored by Platform Switching: A Randomized, Controlled, Split-Mouth Trial with 3-year Follow-up
Lago, Laura / da Silva, Luis / Martinez-Silva, Isabel / Rilo, Benito
Purpose: This randomized, controlled, split-mouth trial with a 3-year follow-up was carried out to compare radiologic changes of crestal bone level (CBL) between splinted tissue-level implants restored by platform matching and bone-level implants restored by platform switching.
Materials and Methods: Periapical radiographs were taken to evaluate the peri-implant crestal bone changes at baseline (implant restoration), at 1 year, and at 3 years after the definitive restoration.
Results: Thirty-five patients requiring a partial fixed dental prosthesis supported by two implants had their sites randomized according to receiving both implant types. Fifty tissue-level implants restored by platform matching, as control implants, and 50 bone-level implants restored by platform switching, as test implants, were placed. For baseline to 3 years, crestal bone changes were 0.18 ± 0.46 mm (P = .043) in the control group and 0.14 ± 0.35 mm (P = .514) in the test group. The mean differences between groups were as follows: baseline to 1 year, 0.07 ± 0.23 mm (95% CI: -0.034, 0.185); 1 to 3 years, 0.01 ± 0.01 mm (95% CI: -0.055, 0.074); baseline to 3 years, 0.04 ± 0.11 mm (95% CI: -0.080, 0.150). No statistically significant differences in CBL at baseline to 1 year (P = .269), 1 year to 3 years (P = .811), and baseline to 3 years (P = .513) were observed.
Conclusion: In this trial, CBL changes in the tissue-level control group were statistically significant only between the baseline and 3-year follow-up. Meanwhile, CBL changes in the bone-level test group were not statistically significant in the different times studied. No statistically significant difference in CBL between two implant types was observed.

Keywords: bone-level implant, marginal bone loss, platform switching, split-mouth, tissue-level implant