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Clinical Efficacy of Narrow-Diameter Tissue-Level Implants for Molar Replacement: A 1-Year Randomised Controlled
Hyun-Woo Park1, Seung Ha Yoo1, Seung-Hyun Park1
1Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, South Korea.
Aim:
To compare 1-year clinical and radiographic outcomes of narrow- versus wide-diameter tissue-level implants for single molar replacement.
Materials And Methods:
This two-arm randomised controlled trial enrolled 20 patients (23 implants) in one sextant. Participants received either 3.5-mm narrow-diameter implants (NDI, n = 12) or 5.0-mm wide-diameter implants (WDI, n = 11) using a tissue-level design with computer-guided surgery. The primary outcome was marginal bone loss (MBL) at 1 year assessed by periapical radiographs. Secondary outcomes included operation time, pre-allocation analysis of augmentation requirement, clinical peri-implant parameters, hard- and soft-tissue dimensions, mucosal recession and buccal soft-tissue contour and implant stability. Non-inferiority margin for MBL was 0.5 mm.
Results:
All 23 implants achieved 100% survival. Mean MBL was 0.39 ± 0.29 mm for NDI and 0.48 ± 0.31 mm for WDI (upper 95% confidence interval [CI]: 0.176 mm), confirming non-inferiority of NDI. Operation time was shorter in this cohort for NDI (20.3 ± 9.3 min) than WDI (28.8 ± 15.3 min; one-sided p = 0.049). Peri-implant clinical parameters were comparable.
Conclusions:
NDI showed non-inferiority to WDI in MBL at 1 year while reducing operative time, supporting NDIs as a viable and efficacious alternative for anatomically restricted posterior sites.
Trial Registration:
Korean ClinicalResearch Information Service Number: KCT00094155.
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