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Influence of implant diameter on the osseointegration of implants ; an experimental study in rabbits 임플란트 직경이 골유착에 미치는 영향에 관한 연구
Jun-Ho Lee, Sang-Wan Shin, Sang-Ho Kwon
이준호, 신상완, 권상호

Statement of problem : The survival rate of wide diameter implants was lower than of 3.75-
mm implants in some clinical researches.
Purpose : The purpose of this study was to investigate the influence of implant diameter on
the osseointegration of implants in the rabbit femoral condyle and tibial metaphyses by means
of removal torque measurements and histomorphometric analysis.
Material and Method : Ten adult New Zealand White rabbits were used in this study. Two
3.75-mm diameter implants were inserted through one cortical layer in the tibial metaphyses and
one 3.75-mm diameter implant was inserted in the femoral condyle. 5.0-mm diameter implants
were inserted in the other leg in the same manner. A total of 60 implants ( 3.75-mm diameter
implants:30 ; 5.0-mm diameter implants:30 ) were installed. After a healing time of 4 and 12
weeks,  the  peak  removal  torque  values  required  to  shear  off  the  implants were  recorded.
From the removal torque values (Ncm) obtained, the mean shear stress (N/㎟) was calculated.
And the percentage of direct bone-to-implant contact and the percentage of bone area inside the
thread were measured by Kappa Image Base-metreo. The Students t-test was undertaken for
statistical analysis (p<0.05).
Results : The removal torque value of 5.0-mm diameter implants was higher than of 3.75-mm
diameter implants (p<0.05). The difference of shear stress value between 3.75-mm and 5.0-mm
diameter implants was not statistically significant (p>0.05). The percentage direct bone-to-implant
contact had no statistical difference between two groups (p>0.05). The percentage of bone area
inside the thread had no statistical difference between two groups (p>0.05).
Conclusion : It is concluded that the qualityof osseointegration is not influenced by increas-
ing implant diameter.

* Keywords: Implant diameter, Osseointegration, Removal torque, Shear stress, Histomorphometric analysis

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