RT Journal Article
T1 Influence of Abutment Shape on Implant Marginal Bone Remodeling: A Double-Blind, Randomized 24-Month Clinical Study
A1 Seijas Naya, Flavio
A1 Bernabeu Mira, Juan C.
A1 Pérez Jardón, Alba
A1 Conde Amboage, Mercedes
A1 Peñarrocha Oltra, David
A1 Camacho Alonso, Fabio
A1 Pérez-Sayáns García, Mario
AB ObjectiveThis study follows a 2-year evaluation to verify marginal bone remodeling (MBR) trends associated with different abutment designs.MethodsA balanced, randomised, double-blind clinical trial with two parallel experimental arms. 68 implants were placed in 9 men and 12 women, 48.5% using the straight abutment and 51.5% the concave abutment. The primary variable was peri-implant tissue stability, measured by marginal bone loss (MBL) or gain (MBG) through digital radiology. Mixed linear regression models and Additive Generalized Additive Models were constructed to estimate MBR, simultaneously considering the variables abutment height, group, and time.ResultsAt 24 months, linear mixed-effects regression models revealed that the concave abutment group exhibited significantly less MBL than the straight abutment group across mesial, distal, and average measurements (p = 0.006–0.026). Significant interactions between abutment type and time at 8 weeks and 6 months suggest early and sustained benefits of the concave design. At 24 months, this effect remained significant except in the mesial model (p = 0.072). Abutment height was positively associated with MBL, particularly in the straight group; however, in the concave group, greater height mitigated bone loss (p < 0.01).ConclusionConcave abutments demonstrated a potential advantage in reducing early marginal bone loss and promoting mid-term bone stability compared to straight abutments. Their design may enhance soft tissue adaptation, contributing to improved peri-implant bone preservation. While increased abutment height showed a protective effect in the concave group, these findings require confirmation. Further long-term studies are warranted to validate these results and clarify their clinical relevance.
PB Wiley
YR 2025
FD 2025-12-30
LK https://hdl.handle.net/10347/46399
UL https://hdl.handle.net/10347/46399
LA eng
NO Seijas Naya, F., J. C. Bernabeu Mira, A. Pérez Jardón, et al. 2025. “ Influence of Abutment Shape on Implant Marginal Bone Remodeling: A Double-Blind, Randomized 24-Month Clinical Study.” Clinical Oral Implants Research 1–11. https://doi.org/10.1111/clr.70085
NO The study was supported by Nueva Galimplant and the Universidade de Santiago de Compostela (Ref. USC-2019-ce178). The funding source played no role in the design of this study, the data collection and analyses, the decision to publish, and the preparation of the manuscript. M. Conde-Amboage acknowledges the financial support received through grant PID2020-116587GB-I00 funded by MCIN/AEI 10.13039/501100011033 and the European Union.
DS Minerva
RD 19 may 2026