抄録
Follow-up measurements of the abutment tooth mobility were carried out to examine the mobility changes for a long period of 12 to 14 years. The subjects were 6 patients, having 12 abutments and they were wearing mandibular unilateral distal extension partial dentures of the same design.
These results were as follows:
1) The tooth mobility of the abutment hadn’t increased exclusively by the wearing of the distal extension denture over a 10-year period. Among the 12 abutments, 7 abutments showed nearly the same degree of mobility as the initial level, and the mobility of the other 4 abutments increased slightly. However, one abutment alone was extracted because of severe increased mobility.
2) There was an extremely slight difference in the mobility between both abutments and the mobility of each abutment presented nearly the same amount. Also the tendency in the mobility change indicated a similar pattern.
3) The long-term prognosis of mandibular unilateral distal extension partial denture, of the most common clasp design, presented a favourable state during the 12 to 14 years, judging from the changes in the abutment mobility.
