J Korean Assoc Oral Maxillofac Surg 2009; 35(3): 170~175
Hye-Won Park, Myung-Rae Kim, Sun-Jong Kim
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Purpose : The purpose of this study is to evaluate 7-year survival rate of implants placed without bone graft in posterior maxilla and compare the
survival rate by the age and gender of patient, length and diameter of implant, region of implant placement, bicortical engagement of fixture, and connection
of prosthesis.
Material and methods : 78 patients (170 implants) who visited our institution from 2002 to 2007 and were followed up with panoramic view and
medical records. Kaplan-Meier survival analysis and Log Rank (Mantel-Cox) test were used.
Results and conclusions : A 7-year cumulative survival rate for implants placed in posterior maxilla without sinus graft was 95.3%. The survival
rate in men was 91.8%, significantly lower than 98.8% in woman.(p<0.05) .However, the survival rate by the length of the implants did not show any
significant differences.(p>0.05), while the wide platform implant resulted in 85% survival rate which was statistically lower than 98.5% in regular
platform. The posterior maxillary implants engaged bicortically showed 97.6% of 7-year Survival rate, comparing 88.6% in not engaged implants. The
survival rate of the single implant was 91.2%, while 98.5% in splinted prosthesis. Therefore, the bicortical engagement of the fixtures and splinted
prosthesis may be recommended to get a long-term survival rate in posterior maxilla.
Keywords: : Posterior maxilla, Survival rate, Sinus augmentation

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