[In vivo radiotelemetric study of strain on the rabbit mandible]

Using strain transducer to measure bone strain and stress in vitro on-line techniques are more popular. In this article, the radiotelemetric method is selected for measuring living tissue mechanic properties. The angle of rabbit mandible serves as tested site. The transducer is minutely foil type electrical resistance strain gage. The measuring instruments are KYOWA telemeter for strain measurement MRT-200 series. When the mandible is in rest position, the tested site shows no change of strain; when the mandible acts without eating any food, small change of strain appear; when the rabbit mastication two kinds of food, the tested site shows the regular change of tension strain and compressive strain, the former is about 150 microstrain and latter is about 30 microstrain. The rates of strain are different when the animal mastication the different foods. Comparing with the on-line technique method, the radiotelemetric method has significant advantages, and is the better test way for studying mechanic properties of living tissue.