The effect of bead diameter on the accuracy of two current techniques used to quantify bone ingrowth in porous-coated implants

✍ Scribed by V. L. Caja; A. Moroni; E. L. Egger; F. Gottsauner-Wolf; E. Y. S. Chao

• Book ID: 104629550
• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 847 KB
• Volume: 5
• Category: Article
• ISSN: 0957-4530
• DOI: 10.1007/bf00121150

✦ Synopsis

The effect of the bead diameter on the accuracy of two techniques used in bone ingrowth quantification, microradiography and backscattered electron imaging-scanning electron microscopy (BEI-SEM), was assessed using porous-coated implants. Two groups of seven titanium porous implants (group A: bead size 250-350 p.m and group B: 500-700 I~m) were implanted for 12 weeks in a canine model. After euthanasia, the same histological slides were prepared for microradiography and BEI-SEM. The percentage of bone, bone ingrowth, bone ongrowth, porosity and bone index were determined by a point counting method using images from both techniques. ANOVA and Tukey's test were used to compare the results from the different bead sizes and techniques. The results showed significant higher bone ingrowth in microradiography groups, and significant lower porosity in only the fine-bead microradiography group (group A size). Microradiography also obtained significantly higher bone ongrowth, but only for the coarse bead size group (group B). From these results it was concluded that microradiography decreases the porosity of the porous coating compared with BEI-SEM. This effect seems to be dependent on the bead diameter. The smaller the diameter, the greater the effect. Furthermore, microradiography increases bone ingrowth which seems to be affected independently of the bead diameter, becoming the most sensitive parameter to increase.