[Effects of various condylar operations on its compressive mechanical property and bone density]

To investigate the changes and relationship of condylar mechanical properties and its material character after various condylar operations.

Condylar compressive mechanical properties and its bone mineral content were analyzed quantitatively by compressive mechanical property measurement technique and dual energy X-ray absorptiometry in 6 and 6 adult dogs undergone either high shaping or reconstruction of condyles respectively, and compared with 12 normals.

Condylar elastic--limit load and displacement, its largest load and displacement were the highest in control, but stiffness and bone mineral content were the highest in high-shaping group, all data were the lowest in the reconstruction ones. There was marked and extremely marked linear positive relativity among condylar elastic--limit load, largest load, stiffness and bone density, in which all relative coefficients exceeded 0.862.

The changes of condylar shape induced by various operations directly influence its compressive mechanical properties and bone mineral content. There is linear positive relativity between condylar compressive mechanical properties and its bone mineral density.