J Korean Assoc Oral Maxillofac Surg.  2009 Jun;35(3):170-175.

Survival rate of the dental implants placed in posterior maxilla without sinus augmentation

  • 1Department of Implantology, Graduate School of Clinical dentistry, Ewha Womans University, Korea. sjsj7777@ewha.ac.kr
  • 2Department of Oral and Maxillofacial Surgery, Mok-dong Hospital, School of Medicine, Ewha Womans University, Korea.


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.
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.


Posterior maxilla; Survival rate; Sinus augmentation

MeSH Terms

Dental Implants
Medical Records
Prostheses and Implants
Survival Rate
Dental Implants
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