コーヌス冠支台歯の挙動に関する実験的研究

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In the removable partial denture, especially in the unilateral distal-extension denture, it is very important to minimize the denture movement and to make the occlusal forces appropriately distribute to the abutment teeth and residual ridges. In this study, the characteristic movements of the Konus Krone partial denture and the abutment teeth were investigated utilizing the mandibular kinesiograph (MKG) on a Kennedy Class II simulation model. Three types of unilateral distal-extension partial dentures were constructed : Type I, having a single Konus Krone abutment tooth ; Type II, having two Konus Krone abutment teeth whose outer crowns were connected ; and Type III, having two Konus Krone abutment teeth whose inner and outer crowns were respectively connected. The results obtained were summarized as follows. 1. The movement of the distal abutment tooth was significantly larger than that of the mesial one when a load was applied to the denture. 2. Type I showed the smallest movement of the distal abutment tooth. The tooth movement was significantly increased by connecting the crowns although the movement of the outer crowns was decreased. Particularly the inclination of the tooth to the distal direction was induced in Type II. 3. The movement of the distal abutment tooth was the smallest in Type III and the largest in Type I. 4. The outer crown movement was larger than the tooth movement. The tendency was marked in the mesial abutment tooth. 5. In Type I, no significant changes in the tooth movement were caused by increasing in the applied load. 6. Type III was effective for reducing the denture movement when the applied load was smaller. However, its superiority was damped as the load was increased. 7. On vertical loading to the denture, the outer crowns and the abutment teeth inclined to the opposite directions each other. 8. The largest tooth movement was found to occur on buccal or vertical loading. 9. There were no significant differences in the abutment tooth movement between the loadings to the second premolar and to the second molar of the denture. 10. It was suggested from the foregoings that Type I might be favorable for protecting the mucous membrane against damages and Type III for ensuring the denture stability.
九州歯科学会の論文
1989-12-25

コーヌス冠支台歯の挙動に関する実験的研究

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