Abstract
To compare clinical outcomes of 'extra-short' and regular bone level implants in the posterior maxilla for 12 months after loading. Twenty-three systemically healthy, non-smoking patients received 30 extra-short, 24 regular bone level implants. Acrylic stents were fabricated for each patient for correct implant positioning. Implant lengths were 4-6mm in the test, 8/10mm in the control group. Radiographic evaluation was performed at baseline, 6, and 12 months after loading. Crestal bone level (CBL), CBL change (CBLC), true crown length (TCL), implant/crown ratio (ICR) and residual bone height (RBH) below maxillary sinus floor were calculated digitally. Data were tested statistically. Residual bone height was significantly lower, and TCL and ICR were higher in the test than the control group (P<0.0001). CBL measurements at baseline were 0.19±0.18mm and 0.31±0.37mm and at 12 months, 0.24±0.24mm and 0.41±0.31mm, respectively in the test and control groups. CBL values at 12 months were significantly lower in the test than the control group (P<0.05). CBLCs were similar at all times (P>0.05). No correlation was found between the CBLC and implant/prosthetic parameters. Extra-short and regular implants might provide similar clinical outcomes in prosthetic rehabilitation of atrophic maxilla, during 12 months follow-up.
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