title: A prospective, multicenter study assessing the DENTSPLY Implants, OsseoSpeed(™) TX, length 6 mm in the posterior maxilla and mandible: a 1-year follow-up study.
abstract: OBJECTIVE
  The aim of this multicenter study was to prospectively assess clinical and radiographic outcomes of short implants (length 6 mm) in the posterior region and early-loading with splinted-fixed dental prostheses.
  
  
  METHODS
  A total of 45 subjects (77.8% with chronic periodontitis) were enrolled at three study sites. In total, 95 implants (diameter 4 mm, length 6 mm; OsseoSpeed(™) 4.0 S; DENTSPLY Implants; Mölndal, Sweden) were placed, two or three implants per subject, using one-stage surgery and loaded with a screw-retained splinted ceramic-fixed prosthesis 6 weeks later. Clinical and radiographic examinations were performed preoperatively, post-surgery, at loading, and 6 and 12 months after prosthesis placement.
  
  
  RESULTS
  Four implants failed before loading; all other implants showed favorable clinical and radiographic findings throughout the observation period (1-year survival and success rate: 95.8%). Postoperative pain and swelling were negligible. Mean changes in marginal bone levels measured from loading were minimal (0.01 ± 0.37 and -0.13 ± 0.46 mm after 6 months and 1 year, respectively). Bone loss less than 1.00 mm was found in 77.5% implants, and bone gain was found in 15.5% implants. Probing depth change less than 2 mm was found in 98.7% of the implants between loading and 1-year follow-up. Prosthetic complications included one ceramic veneer chipping.
  
  
  CONCLUSIONS
  One-year data indicate that the use of 6-mm-long implants is a predictable treatment. This provides a good treatment option in situations with limited bone height in posterior regions.
authors: Department of Periodontology, Peking University School of Stomatology, Beijing, China.
authors: Jie
authors: J
authors: Han
authors: The first dental center, Peking University School of Stomatology, Beijing, China.
authors: Xiao
authors: X
authors: Zhang
authors: The 2nd dental center, Peking University School of Stomatology, Beijing, China.
authors: Zhihui
authors: Z
authors: Tang
authors: Department of Periodontology, Peking University School of Stomatology, Beijing, China.
authors: Li
authors: L
authors: Zhang
authors: Department of Periodontology, Peking University School of Stomatology, Beijing, China.
authors: Dong
authors: D
authors: Shi
authors: Department of Periodontology, Peking University School of Stomatology, Beijing, China.
authors: Huanxin
authors: H
authors: Meng
mesh_terms: D016301:Alveolar Bone Loss / Q000209:etiology; D003758:Dental Implantation, Endosseous / Q000009:adverse effects; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D011446:Prospective Studies; D013548:Sweden
chemical_list: D015921:Dental Implants
keywords: early-loading; implant; marginal bone loss; periodontitis; posterior; short