Objectives:Tooth autotransplantation is very useful method for missing tooth. To keep the function of autotransplantated tooth for a long term, it is important to harmonize with stomatognathic system, especially periodontal tissue. The aim of this study was to evaluate the displacement of autotransplantated tooth during function.

Methods:Upper left third molar was autotransplanted in the lower left second premolar region of a 27 years old female patient. After 6 months, we cemented complete cast crown. 1 month later, the displacement of autotransplanted tooth was investigated during clenching at the intercuspal position with light and heavy clenching force using tooth displacement transducer, Type M-3. As a control, the displacements of lower left first molars of four male subjects (age between 26-30 ) with a healthy periodontium were investigated. And we also measured tooth displacement and occlusal force simultaneously at the subject tooth and adjacent teeth.

Results:The autotransplanted tooth showed a displacement ranging from 13 to 39 mm with light clenching force and from 51 to 69 mm with heavy clenching force. The control teeth showed a displacement ranging from 18 to 65 mm with light clenching force and from 66 to 100 mm with heavy clenching force. Under 0.5 kgw occlusal force, the amount of autotransplantated tooth displacement was little compared to adjacent teeth with the same occlusal force.

Conclusions:The autotransplantated tooth moves less than normal tooth during heavy clenching force. It means that autotransplantated tooth may cause occlusal trauma if we fabricate occlusal surface as usual.

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