重庆医科大学：《口腔正畸学》课程教学课件（PPT讲稿）保持 Retention

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

Retention Orthodontic treatment ↓↓ Active treatment Retention

Orthodontic treatment Active treatment Retention Retention

Retention The requirements for retention are often decided at the time of diagnosis and treatment planning.The correct diagnosis, logical treatment plan,and the timing of treatment plan must be directed toward ideal esthetics,ideal function,and the permanent maintenance of these ideals

Retention The requirements for retention are often decided at the time of diagnosis and treatment planning. The correct diagnosis, logical treatment plan, and the timing of treatment plan must be directed toward ideal esthetics, ideal function, and the permanent maintenance of these ideals

Retention A satisfactory balance of utility,beauty, and stability often simplifies (and may even avoid)retention by mechanical appliances. On the other hand,incorrect diagnosis or treatment complicates the requirements for retention

Retention A satisfactory balance of utility, beauty, and stability often simplifies (and may even avoid) retention by mechanical appliances. On the other hand, incorrect diagnosis or treatment complicates the requirements for retention

Retention There is only one way to completely avoid relapse.At the end of treatment,remove the braces,polish the teeth,make study models and take photographs.And then take the patient out the back door of the office and shoot him Dr Tom Graber DMD South African Dental Congress.August 1992

There is only one way to completely avoid relapse. At the end of treatment, remove the braces, polish the teeth, make study models and take photographs. And then take the patient out the back door of the office and shoot him - Dr Tom Graber DMD South African Dental Congress. August 1992 Retention

Why is Retention necessary ● Reorganization of gingival and periodontal tissues after orthodontic treatment Soft tissue pressure relapse tendency. Changes produced by growth may alter treatment results

⚫ Reorganization of gingival and periodontal tissues after orthodontic treatment. ⚫ Soft tissue pressure – relapse tendency. ⚫ Changes produced by growth may alter treatment results. Why is Retention necessary ?