One-Piece Implants with Smooth Concave Neck to Enhance Soft Tissue Development and Preserve Marginal Bone Levels: A Retrospective Study with 1- to 6-Year Follow-Up

Abstract EN

Novel one-piece implants with concave smooth neck have been introduced to promote the formation of a thick mucosal layer and preserve marginal bone.

A retrospective study on 70 patients with 1- to 6-year follow-up was carried out.

Cumulative survival rates were assessed.

Variations of marginal bone level were measured on periapical radiographs as distance of the implant-abutment junction from the bone crest.

Influence of different variables on treatment outcome was evaluated.

Cumulative success rate after 6 years was 99.4 % at implant level and 98.6 % at patient level.

Marginal bone level changed in a significant way over time.

After 4 months, an increase of radiographic bone level of 0.173 ± 1.088 mm at implant level and 0.18 ± 1.019 mm at patient level was recorded.

Mean marginal bone loss after 5 years was 0.573 ± 0.966 mm at implant level and 0.783 ± 1.213 mm at patient level.

Age, sex, smoking habits, implant sites, implant lengths and diameters, prosthetic retentions, and timing of loading did not influence marginal bone remodeling in a statistically significant way.

At 4-year follow-up partial restorations lost a mean of 0.96 mm of more marginal bone compared with single restorations.

This difference was statistically significant.