Survival rates of ultra‐short (<6 mm) compared with short locking‐taper implants supporting single crowns in posterior areas: A 5‐year retrospective study. (18th November 2021)

• Record Type: Journal Article
• Authors: Lombardo, Giorgio; Signoriello, Annarita; Marincola, Mauro; Liboni, Pietro; Bonfante, Estevam A.; Nocini, Pier F.
• Is Part Of: Clinical implant dentistry and related research. Volume 23:Number 6(2021)
• Page Start: 904
• Page End: 919
• Publication Date: 2021-11-18
• Subjects: bone loss -- crown‐to‐implant ratio -- peri‐implantitis -- short -- single crown -- success -- survival -- ultra‐short; Dental implants -- Periodicals; Dental Implantation -- Periodicals; Dental Implants -- Periodicals; 617.693
• DOI: 10.1111/cid.13054
• Languages: English
• ISSNs: 1523-0899

Abstract

Abstract: Background: Short and ultra‐short implants represent a predictable treatment, in terms of implant survival, with patients presenting insufficient available bone volumes. Moreover, single crown restorations represent a gold standard in terms of oral hygiene. Purpose: The aim of this retrospective study was to evaluate implant survival, marginal bone loss, and peri‐implant complications in 333 locking‐taper short and ultra‐short implants. Materials and Methods: Implants were placed in the maxillary and mandibular posterior regions of 142 patients. Clinical and radiographic examinations were performed at 5‐year recall appointments. Results: All implants placed consisted of 8.0‐, 6.0‐, and 5.0‐mm length, 38.14%, 34.53%, and 27.33%, respectively. Three hundred thirty‐two implants (one early failure) were rehabilitated with single crowns in 141 patients. In 45.48% of the implants the crown‐to‐implant ratio was ≥2, with a mean value of 1.94. Overall implant‐based survival after 5 years of follow‐up was 96.10%: 96.85%, 95.65%, and 95.60% for 8.0‐, 6.0‐, and 5.0‐mm length implants, respectively ( p = 0.82). Overall patient‐based survival was 91.55%. Regarding crestal bone level variations, average crestal bone loss and apical shift of the &quot;first bone‐to‐implant contact point&quot; position were 0.69 and 0.01 mm, respectively. Setting the threshold for excessive bone loss at 1 mm, during the time interval from loading to follow‐up, 28 implants experienced loss of supporting bone greater than 1 mm: 19 of them (67.85%) were surgically treated with a codified surgical regenerative protocol. After 60 months, a peri‐implantitis prevalence of 5.94% was reported, with an overall implant success of 94.06%: 95.93%, 92.73%, and 93.10% for 8.0‐, 6.0‐, and 5.0‐mm length implants, respectively ( p = 0.55). Conclusion: Long‐term outcomes suggest that short and ultra‐short locking‐taper implants can be successfully restored with single crowns in the posterior area of the maxilla and mandible.