Abstract: Objective To evaluate the long-term clinical efficacy of restoration abutments with different transgingival heights after 5 years of implant restoration. Methods Patients who underwent implant restoration for dental defects in the Department of Stomatology, the Fourth Affiliated Hospital of Nanchang University from January 2015 to September 2015 were selected and divided into four groups according to the different transgingival heights of the restoration abutment selected when the final restoration was completed: Group A (≤1 mm), Group B (2 mm), Group C (3 mm), Group D (4 mm). According to the grouping situation, measurement was performed immediately after the implantation, when the final restoration was completed, and at least 5 years after the restoration using curved tomography to analyze the changes in the bone tissue at the implant neck. Results During the observation period, after at least 5 years of functional loading, the success rate of 63 implants was 96.83%. Among the four groups, the amount of bone tissue absorption around the implant in group A [T2-T1:（-0.627 ±1.030） mm]and in group B[T2-T1:（-0.017±0.424 ）mm]was statistically significant (P<0.05). The relationship between the prosthetic abutment with different transgingival heights and the exposure of the implant neck platform was statistically significant (P<0.05). Conclusion For self-locking taper-retained implants, when the final restoration is completed, the choice of restoration abutments with different gingival heights will have a certain impact on the absorption of bone tissue around the implant. Long gingival restorations are used under the same implant depth. The table can reduce the exposure of the implant neck platform after functional weight-bearing, thereby reducing the risk of infection of the implant from the surrounding environment.

Key words: Taper implant, Transmucosal height, Bone resorption, Platform exposure