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Clin Implant Dent Relat Res. 2016 Feb;18(1):129-37. doi: 10.1111/cid.12269. Epub 2014 Sep 2.

Clinical and Radiographic Comparison between Platform-Shifted and Nonplatform-Shifted Implant: A One-Year Prospective Study.

Author information

1
Department of Periodontology and Oral Implantology, Dental School, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
2
Department of Prosthodontics, School of Dentistry, Malmö University, Malmö, Sweden.

Abstract

BACKGROUND:

Developments in implant hardware and biologic understanding improved treatment predictability in terms of implant survival. Current research focuses on accelerated loading protocols and crestal bone preservation.

PURPOSE:

This prospective, monocenter study analyzed the clinical and radiographic outcome of a novel parallel-walled implant, with and without platform shift.

MATERIALS AND METHODS:

Forty-eight consecutively treated patients (30 women, 18 men) with crowns/bridges supported by 115 implants were included. Eighty-three percent of implants were nonocclusal, immediately loaded, and 17% were subjected to one-stage surgery and delayed loading after 10 weeks; 39.1% were of diameter 5.0 mm, enabling platform shifting with a 4.0 mm-wide prosthetic component; 60.9% were of diameter 4.0 mm with a 4.0 mm component. Radiographic crestal bone levels were assessed at baseline and 1 year. A multivariate statistical analysis was performed to determine factors affecting crestal bone loss after 1 year.

RESULTS:

All implants survived and mean marginal bone loss was 0.73 mm (SD: 0.13; range: -0.60 to 5.0 mm). There was a statistically significant difference between platform-shifted (0.63 mm; SD: 0.18) and nonplatform-shifted (1.02 mm; SD: 0.14) implants. Implants in abundant bone volume lost significant less crestal bone (0.45 mm; SD: 0.14) compared with implants in small volume (1.20 mm; SD: 0.21). Implant diameter, loading time, anatomical position, smoking, and bone quality did not affect crestal bone loss.

CONCLUSION:

After 1 year of loading, both implant-prosthetic features yield a high survival and limited crestal bone loss. Crestal bone loss is minimized using platform-shifted implants placed in sufficiently voluminous bone. To limit the crestal bone loss, an adopted implant diameter with platform shifting should be considered.

KEYWORDS:

bone volume; dental implants; immediate loading; implant design; osseotite 2; platform shifting

PMID:
25180683
DOI:
10.1111/cid.12269
[Indexed for MEDLINE]

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