The Effect of Two-Piece Abutment Concept and Abutment Reconnection/Disconnection on Marginal Bone Level Changes: A Split-Mouth Randomized, Parallel-Designed, 36-Month Follow-Up, Preliminary Clinical Study

A significant difference was found between the groups in mesial, distal, and mean ΔMBL at T0-T1 and distal and mean ΔMBL at T0-T3 values. (p<0.05) Emergence angle values were found to be below 30 degrees both mesially and distally in both groups. (p>0.05) A statistically significant correlation was found between healing/definitive abutment disconnection/reconnection and distal ΔMBL T0-T3. (p<0.05) Conclusion: Within the limitations of the study, although the sample size was limited, with the study design and minimizing confounding factors, it was concluded that two-piece definitive abutment application may have significant effects in terms of reducing ΔMBL changes in both the short and long term. However, further studies with a larger sample size are needed. The study was prospectively registered on the international Clinicaltrials.com registry (NCT05592821).