Retrospective clinical study of 988 dual acid-etched implants placed in grafted and native bone for single-tooth replacement.
OBJECTIVE
To evaluate the influence of sex, implant characteristics, and bone grafting on the survival rate of dual acid-etched (DAE) implants.


METHODS
Patients treated with internal-hex DAE implants for single tooth replacement in a military dental clinic between January 2005 and December 2010 were included in this study. Clinical data related to implant characteristics, implant location, presence of grafted bone, and implant failures were collected. The primary outcome was implant loss. The survival rate was analyzed using the Kaplan-Meier method. Cox regression modeling was used to determine which factors would predict implant failure.


RESULTS
DAE implants were evaluated in a total of 988 patients (80.3% men). Twenty-four (2.4%) implants failed, most were cylindric (54.2%) with regular platforms (70.8%) and were 10 mm long (58.3%). The failure rate was 2.4% for the anterior maxilla, 3.3% for the posterior maxilla, 1.6% for the anterior mandible, and 2.0% for posterior mandible. The cumulative survival rate was 97.6%. The failure rate was 8.8% in implants placed after sinus augmentation, 7.3% in bone block-grafted areas, and 1.6% in native bone. Based on multivariable analysis (Cox regression), sinus augmentation and bone block grafting had a statistically significant effect on implant failure; the hazard ratios were 5.5 and 4.6, respectively.


CONCLUSIONS
The results revealed that DAE implants had high survival rates, and no influence of sex, location, shape, diameter, or length on failure rates could be observed. However, a significant association was observed between failure and presence of bone graft in the implant area.
Department of Prosthodontics, School of Dentistry, University of São Paulo, São Paulo, Brazil. sesma@usp.br
Newton
N
Sesma
Cláudio  Mendes
C
Pannuti
Giuseppe
G
Cardaropoli
D000134:Acid Etching, Dental; D016025:Bone Transplantation; D001938:Brazil; D003758:Dental Implantation, Endosseous / Q000009:adverse effects / Q000379:methods; D019250:Dental Implants, Single-Tooth; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible; D008437:Maxilla; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012737:Sex Factors; D014070:Tooth / Q000601:surgery