As for the orthodontic anchor screw (OAS) had been clinical used, many fundamental researches and clinical reports have been published from the late 1990s. The shape of OAS and equipment for the implantation to get higher success rate were developed by the accumulation of knowledges. Furthermore, we came to be able to almost embody it about the mechanics while using OAS as an anchorage directly or indirectly in clinical use. These beautiful consequences were brought by smart senior especially in Korean, Japanese and Taiwanese orthodontist ahead of other countries. At this distance of time, OSA is as one of biggest epochmaking as direct bonding system in orthodontic field. So, we are just profoundly grateful this wonderful progress of treatment method by using TADs.
In this symposium, I'd like to talk two topics about implantation method and force application. As a first topic about implantation method, we had considered about the magnitude of torque during implantation. This was caused by considering about cortical bone strength in maxilla and mandible alveolar bone. For the established this implantation method, we always use torque controllable driver, and developed implantation guide accomplished by digital technology. Next topics is about the force application differences in placement point of OAS, bracket size, wire sequence and so on.
We must look back toward the orthodontic treatment using OAS which has been performed until now, and the problems should wrestle to become clear. We, orthodontists have to think and build more substantial evidence to next generation. At this symposium, I would like to introduce some actions in my clinic and hope to discuss present problems.