重庆医科大学附属口腔医院 保持 Retention 重庆医科大学口腔正畸教研室 吴杨
保 持 Retention 重庆医科大学口腔正畸教研室 吴杨 重庆医科大学附属口腔医院
CHAPTER OUTLINE ●Definition Why is Retention Necessary ●Basic Theorems ●Retainer ●Timing of retention ●Relapse
CHAPTER OUTLINE ⚫ Definition ⚫ Why is Retention Necessary ⚫ Basic Theorems ⚫ Retainer ⚫ Timing of retention ⚫ Relapse
Retention The final phase of orthodontic treatment is retention.Teeth that have been moved in or through bone by mechanical appliances have a tendency to return to their former positions.It is the purpose of retention to counteract this tendency
Retention The final phase of orthodontic treatment is retention. Teeth that have been moved in or through bone by mechanical appliances have a tendency to return to their former positions. It is the purpose of retention to counteract this tendency
Retention A working definition of retention in relation to orthodontics might be stated as follows:the holding of teeth in ideal esthetic and functional positions Relapse has been defined by the British Standards Institute as the return,following correction,of the features of the original malocclusion
Retention A working definition of retention in relation to orthodontics might be stated as follows: the holding of teeth in ideal esthetic and functional positions. Relapse has been defined by the British Standards Institute as the return, following correction, of the features of the original malocclusion
Retention Retention should not be relegated to being an afterthought at the end of treatment;it should be considered at the planning stage and explained to the patient as an integral part of the overall treatment
Retention Retention should not be relegated to being an afterthought at the end of treatment; it should be considered at the planning stage and explained to the patient as an integral part of the overall treatment