Grant BT, Pancko FX, Kraut RA. Outcomes of placing short dental implants in the posterior mandible: A retro-
spective study of 124 cases. J Oral Maxillofac Surg 2009; 67:713–717.
Division of Oral and Maxillofacial Surgery, Department of Dentistry, Montefiore Medical Center, Bronx, NY 10467
The purpose of this retrospective study was to determine the overall success of short dental implants (8 mm in
length) placed in the partially or completely edentulous posterior mandible restored with fixed and removable pros-
theses. A total of 124 patients had 335, 8-mm-long implants placed from May 2005 until June 2007. Of the 124
total patients, 35 were men and 89 were women, with a median age of 56 years and an age range of 18 to 80
years at the time of implant surgery. There were 112 patients who were partially edentulous and 12 who were
completely edentulous. Of the patients, 32 had a single implant placed whereas the other 92 had multiple implants
placed. One patient had the implants immediately provisionally loaded. All of the implants were restored by use of
fixed prostheses. Of these fixed prostheses, 245 were splinted together whereas 75 were restored individually. A
total of 335 short implants were placed in 124 patients. Of the 335 implants placed, 331 integrated suc-
cessfully. In the two cases that failed, the sites were grafted with porous hydroxyapatite and platelet-rich
plasma. The implants were replaced at 5 months after the initial failure in the first patient and at 7 months in the sec-
ond patient. These replacement implants integrated and have been restored and in function for more than 16
months. There was one fracture of an implant with a restoration. The implant had been restored with an individually
fabricated fixed restoration, with the fracture occurring at the head of the implant, requiring removal. The implant
and restoration had been in function for 10 months before fracture. There were no other fractures of implants or
restorative hardware noted in this study. The survival rate for 8-mm implants placed in the mandible was 99% from
stage I surgery to a functional prosthesis for up to 2 years. Placement of short implants is a predictable treat-
ment method for patients with decreased posterior mandibular bone height.
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