Four-Year Survival Rate of Internal Connection Non-Submerged Implants and the Change of the Peri-Implant Crestal Bone
By: Hye-Ran Jeon, Myung-Rae Kim, Dong-Hyun Lee, Jung-Sub Shin, Na-ra Kang
Materials & Methods:
Implant-supported fixed and removable prostheses provide a proper treatment modality with reliable success. The SSII implants is a one-stage nonsubmerged threaded titanium implants with Resorbable Blasting Media surface developed by Osstem implant (Seoul, Korea) in October of 2002. This study is to evaluate the survival rate of the SSII implants for 4 years using radiographic parameters and to review the retrieved implants by the cytotoxicity tests.
Since September 2003. 439 SSII implants had been used for 173 patients at Ewha Women University Medical Center in Korea. Patients consisted of 91 females (52.6 %) and 82 males (47.4 %). The patients’ mean age was 42 16 years. ranging from 21 to 83 years. The follow-up period ranged from 9 to 46 months (mean F/U 24.2 10.2 months).
Fig. 1. A computer-assisted calibration was carried out for each single site by evaluating the given distance between several threads (pitch: 0.8 mm).
The results are as follows:
- Of 439 implants, 17 implants were removed and 4-year cumulative survival rate was 96.1%.
- 82.3% of 17 failed implants were founded during healing phase, and 94.1% of failed fixtures were removed within 5 months after implantation.
- Crestal bone around the implants was resorbed to 1mrn in 89.0%. to 1-2 mm loss of the marginal bone in 8.3%. And the bone loss over 2 mm was occured in 2.7%.
- Microscopic examination of the retrieved implants disclosed Grade 0 cytotoxicity in 4 and Grade 1 cytotoxicity in 2 of 6 groups divided according to lot numbers. Inhibition rate with optical density was acceptable as low as ISO standard.
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