Sequential changes in microdamage resulting from insertion of temporary anchorage devices

概要

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Temporary anchorage devices (TADs) are used to provide anchorage during orthodontic treatment. However, it has been reported that the microdamage (MD) that occurs during their insertion may cause dislodgement. No reports have investigated the sequential changes in MD resulting from the use of the TAD. We investigated the number of incidents and the length of MD occurring in the surrounding compact bone. Ten TADs were placed in each tibia of two beagle dogs used in this investigation. The four tibias were divided into the 4 groups of the 0, 1, 4 and 8 weeks after placement. Specimens were prepared for observation by light microscopy and scanning electron microscopy. The number of incidents of MD that occurred when TADs were placed did not increase over time. The length of the MD increased rapidly between 0 and 1 weeks after placement, increased slowly between 1 and 4 weeks, and then decreased slowly between 4 and 8 weeks. This suggests that orthodontic load should be applied no sooner than 8 weeks after placement.