Functional hard and soft tissue regeneration around Profile implants placed in sloped alveolar ridges - 10-year results

15600 ORAL COMMUNICATION CLINICAL RESEARCH - PERI-IMPLANT BIOLOGY

Background

To cover the physiological height difference problem of sloped alveolar ridge areas an implant with a sloped shoulder (Astra Tech OsseoSpeed Profile, Mölndal, Sweden) has been developed to support the peri-implant structures circumferentially.

Aim/Hypothesis

This study evaluates the functional hard and soft tissue changes especially at the buccal and inter-proximal aspect around Profile implants placed in healed, sloped alveolar ridge sites up to 10-year follow-up examination.

Material and Methods

In a prospective, open, multicenter study, 60 patients with a need for a single implant replacement in any location were included. The recipient sites presented with a lingual-buccal bone height difference of 2.0–5.0 mm and a history of edentulism of at least 3 months. The sloped implants were placed flush with the buccal bone height. 15 patients with 15 implants of one study center were evaluated in the long run. The changes of the interproximal bone level, the buccal bone height, the width of the periimplant keratinized mucosa, the Pink Esthetic Score according to Fuerhauser and the probing depths were evaluated at 1-, 2-, 3-, 5- and 10-year follow-up examination.

Results

Two patients did not continue the follow-up after delivery of the prosthesis respectively the 3-year follow-up examination (drop-out). Mean follow-up of the remaining 12 implants was 120.5 months (range 108 to 123 months). No implant was lost. Interproximal marginal bone levels remained at the level of the implant shoulder (0.1 ± 0.62 mm) at 10-year follow-up examination. The buccal bone height was 0.87 ± 0.87 mm coronal of the implant shoulder. The width of the periimplant attached mucosa improved significantly from delivery (1.77 ± 1.36 mm) to the 1-year follow-up and remained subsequently unchanged up to the 10-year examination (3.33 ± 1.40 mm). The PES improved significantly from delivery of final restoration (7.17 ± 1.47) to 1-year follow-up (11.5 ± 1.41) and remained unchanged up to the 10-year follow-up (11.17 ± 2.13). The mean perimplant probing depths ranged between 2.4 and 3.3 mm at the different aspects around the implants at 10 years.

Conclusion and clinical implications

The implant placement of OsseoSpeed Profile implants in healed and sloped alveolar ridges for single-tooth restoration resulted in a functional hard and soft tissue regeneration and an increase in width of the peri-implant keratinized mucosa. The results of the circumferential marginal bone stability and the periimplant soft tissue increase suggest proof of principle for tissue maintenance around sloped implants in the long-term observation.