Abstract
With an increasing elderly population, the number of overdenture cases will increase. It has been recommended that the exposed dentine of non-coping abutments should be treated with chemical prophylaxis to prevent caries.
Tannin-fluoride preparation (HY agent), which strengthens both organic and inorganic materials, was used for caries prevention of overdenture abutments, because dentine contains both organic and inorganic materials. In this study, tannin cement (HYc), which contains a high percentage of HY agent, was used to prevent abutment caries of ovredentures.
1. The abutments were cut and the cavities at root openings were prepared. HYc was put at the bottom of the cavities, adhesive composite resin restorations were filled in the cavities, and abutment surfaces were smoothed.
2. The results of GI, GCF and probing depth indicate good gingival health around the abutments.
3. One tooth showed high PlI and caries activity test scores, and so this tooth needs caries prevention until the components of HYc become effective.
4. With this method, there is no need for treatment of the denture base for caries prevention.
5. It is suggested that this method is effective for prosthetic treatment for the elderly.
